KEVRAY
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Having a lot of issues with games always crashing, have tested and tested some more with 320.18 drivers and the drivers on the disc that came with the GTX 780 which is 320.11. I think i have narrowed it down to either inadequate power supply unit, bad drivers or bad games when in SLI mode, some game will play ok for a short while then crash and some just crash every 10 minutes or and even less. Single GTX 780 is just fine. My Power Supply Unit is a Corsair HX850W, what PSU does EVGA or anyone that uses 2-way SLI recommend?. Thanks.
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jfgamer
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 6:37 AM
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I love my corsair AX1200 its been kicking ass for 1 yr and a half now no issues with OC ever
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rjohnson11
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 7:36 AM
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I am using a Corsair AX1200 myself and have three video cards (GTX 780 with ACX/GTX 680/GTX670) and no problems here
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oshia86
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 11:05 AM
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I'm not really sure how a 1200 watt psu is relevant in this case.
OP, a HX850 is plenty for that setup. Now, that isn't to say there isn't something up with yours specifically. I've ran 580sli, 680sli, and now 780sli on my HX850 and I haven't had a single issue with it. Do you by chance know if yours is still under warranty?
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RainStryke
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 11:07 AM
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oshia86
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 11:16 AM
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You do know that is a guess for just the power draw of the cards alone, correct? I don't put a whole lot of faith in their psu calculations. Titan's in sli only use 486 watts but tri sli uses 739? How does that make sense?
Also, why would a 650w be a good idea? I pulled over 650 from the wall with my cards, which was done with an actual Kill-A-Watt. You'll be maxing out that psu quick with any sort of stress tests.
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CrazyCanukk
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 11:29 AM
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A 1200w isn't really needed for 2 GTX780's IMO My system uses at load when gaming about 300w with the following (as read by my UPS unit for total Power out to system thats plugged into the backup) My UPS displays in real time how much power its supplying to the battery back-up and the highest i have read so far with the below set-up was 300w total and that was while i was gaming. Antec 1200 case w 6 fans (5x120 1x 200) 2x 120mm fan on the CPU cooler 1 x ssd 1x 2 TB hdd 17 3570k at 4.0ghz 1 x gtx 780 SC + various USB peripherals + this includes a 27" monitor as well + Modem and Router I would say an an 850w is just fine. The Corsair TX850m is a very good unit.
post edited by CrazyCanukk - Monday, June 24, 2013 11:32 AM
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BennnX
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 12:01 AM
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Just calculate...
You know the Watt of the CPU you know the Watt of the cards. I guess adding this shouldnt be that hard and you know what you PSU you need. So For example you have 2x GTX 780 that should be around max 500Watt since a regular GTX 780 do have 1x8pin and 1x6pin => Max 250Watt.
Now you have a I7 6core or something with 150Watt and here you go. Without HDD or MB you already need 650Watt So take around 100Watt for the rest and you are fine with a 750Watt PSU if its not a creapy one and you are not overclocking ...
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RainStryke
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 12:06 AM
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oshia86
You do know that is a guess for just the power draw of the cards alone, correct? I don't put a whole lot of faith in their psu calculations. Titan's in sli only use 486 watts but tri sli uses 739? How does that make sense?
Also, why would a 650w be a good idea? I pulled over 650 from the wall with my cards, which was done with an actual Kill-A-Watt. You'll be maxing out that psu quick with any sort of stress tests.
Did you take a look at the CPU configuration? That system uses more power than yours. lol
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oshia86
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 12:28 AM
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And how exactly does that help your case? Right we installed the cards so let's have a look at how much power draw we measure with these graphics cards active and running.
The methodology: We have a device constantly monitoring the power draw from the PC. We simply stress the GPU, not the processor. The before and after wattage will tell us roughly how much power a graphics card is consuming under load.
Our default test system is based on a power hungry Core i7 3960X/ X79 system. This setup is overclocked to 4.6 GHz (core 1.40V). Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results). On average we are using a bit more than a standard PC due to higher CPU clock settings, water-cooling, additional cold cathode lights etc.
We'll be calculating the GPU power consumption here, not the total PC power consumption.
Mind you that the system wattage is measured at the wall socket side and there are other variables like PSU power efficiency. So this is a calculated value, albeit a very good one.
post edited by oshia86 - Monday, June 24, 2013 12:30 AM
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KEVRAY
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 1:25 PM
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oshia86OP, a HX850 is plenty for that setup. Maybe?, but if you take into consideration EVGA say the GTX 780 requires a 600W or greater PSU, then according to NVidia's specification of the GTX780 power spec, another added into the system will require 250W, that is cutting it fine with an 850W PSU. Plus I have had the Corsair HX850W a while now so there will be some degradation of the PSU over that time I have been using it. I think I will be going for the Corsair 1200W to be on the safe side.
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zenfoldor
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 1:56 PM
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AX1200 or Seasonic Platinum 1000w
Get the AX1200 because Corsair and their dependable customer service and parts warranty. That said, the Seasonic is the best PSU dollar for dollar imho but they have convoluted customer service or so I've read.
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oshia86
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 2:00 PM
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KEVRAY
oshia86OP, a HX850 is plenty for that setup. Maybe?, but if you take into consideration EVGA say the GTX 780 requires a 600W or greater PSU, then according to NVidia's specification of the GTX780 power spec, another added into the system will require 250W, that is cutting it fine with an 850W PSU. Plus I have had the Corsair HX850W a while now so there will be some degradation of the PSU over that time I have been using it. I think I will be going for the Corsair 1200W to be on the safe side.
Not maybe. It is. It wouldn't take much effort to search and come to the same conclusion. You also should list your full specs when posting threads like this. No harm with going with the 1200w unit. It is just much more than you need.
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zenfoldor
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 2:03 PM
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Also, lots in this thread are discussing minimum specs for PSU. IMHO, PSU is the most important part of the rig, and above all else, the first factor should be the OEM of the individual unit. There are very few consistently good OEM, Corsair isn't an OEM they outsource so each series will have a different manufacturer. Flextronics I believe makes the AX1200. Seasonic is imho, best OEM for any PSU on the market, and you want good clean power to maintain stability and ensure performance overall on your system.
With a Corsair you are getting the customer service of Corsair but you aren't getting any product QUALITY guarantee(most come with Corsair warranty and guarantee, but you don't guarantee quality product just because its corsair as they outsource to good AND bad OEM). You must look at the OEM of the individual units to ensure quality, and you must pick a company with good customer service to ensure a painless RMA as needed. AX1200 has best of both worlds, but again, Seasonic 1000 Platinum PSU is imho, best quality PSU on the market. Each their own, but make sure you pick a quality PSU for your system instead of cheapest you can get away with, because there is a big difference even in the Corsair brand, between models.
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KEVRAY
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 3:20 PM
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oshia86list your full specs when posting threads like this. Ok, specs in sig. I must say though that yesterday I decided to do a fresh install of windows, updated everything, installed 320.18 but only the GPU drivers and PhysX, NVidia control panel at nvidia default settings and SLI enabled. Created a power plan based on high performance, installed ArmA 3 alpha and Tomb Raider 2013 and maxed the games out with 1920x1080, 120Hz, both games run ok and I believe i'm getting good usage/scaling with SLI, well, according to Open Hardware Monitor I am seeing 90+ usage on both GPU cores, temps around 82-84C GPU1 and 80-82C GPU2 (with case side panel removed) case side panel on 89C+ (can depend on ambient or room temps though). Seems stable enough, maybe I just messed up with previous installations and set ups?, although I have not tried the games that did crash a lot (not sure if I want to install and attempt to play those games now though to be honest, I think some games are just bugged out?, or was it my fault?). Love PC gaming and building PC rigs but can be a pain in the neck when things go wrong, and trying to find out what is causing the issues is a nightmare because you can never really be sure-exactly what is causing what issue, game on :).
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rjbarker
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 5:27 PM
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OP....your HX 850 is more than enough power for that set-up.
Not to say a PSU cannot have problems:
1. Check your CPU for stability if OC'd (adding a 2nd Card can change things and your OC may need further tweaking).
2. Avoid using Molex to PCI-E adapters (youre probably not as that PSU has adequate PCI-E cables.
3. Absolute "clean install" of latest Drivers or try previous 314.xx Driver, but keep it clean install!
4. Try disabling nv HD audio if your running other Audio Software, such as Realtek HD Audio
^^ go to Device Manager / Display Adapter / Properties and note which BUS your Adapter is on ....write it down (there will be 2 for 2 Cards)......then go to Device Manager / System Devices and find the nv HD Audio ...disable it.
5. If all this fails and you still have either CTD, Blackscreens or BSOD..then
6. Try running your Memory through Memtest...if Memory all checks out okay.....then...
7. Try to find a similar PSU to test on your Rig, may have to pay a local PC shop a few bucks to test.
8. As a last resort RMA the Corsair PSU.
Those are the steps I would initially take, you certainly dont to go and dump $300 on an AX 1.2 kW ;)
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g_petro
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 6:56 PM
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zenfoldor
Also, lots in this thread are discussing minimum specs for PSU. IMHO, PSU is the most important part of the rig, and above all else, the first factor should be the OEM of the individual unit. There are very few consistently good OEM, Corsair isn't an OEM they outsource so each series will have a different manufacturer. Flextronics I believe makes the AX1200. Seasonic is imho, best OEM for any PSU on the market, and you want good clean power to maintain stability and ensure performance overall on your system.
With a Corsair you are getting the customer service of Corsair but you aren't getting any product QUALITY guarantee(most come with Corsair warranty and guarantee, but you don't guarantee quality product just because its corsair as they outsource to good AND bad OEM). You must look at the OEM of the individual units to ensure quality, and you must pick a company with good customer service to ensure a painless RMA as needed. AX1200 has best of both worlds, but again, Seasonic 1000 Platinum PSU is imho, best quality PSU on the market. Each their own, but make sure you pick a quality PSU for your system instead of cheapest you can get away with, because there is a big difference even in the Corsair brand, between models.
Not al Corsair PSUs are made by Flextronix i think only the digitally controlled i models. I got an AX860 (not the AX860i), last year and it's made by Seasonic. It's been flawless so far. No SLI now since I upgraded to a single 780 sc acx, from a dual gpu 590 classified. I'm sure I'll do just fine if I get a second card.
post edited by g_petro - Monday, June 24, 2013 7:04 PM
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rjbarker
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 8:39 PM
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KEVRAY
oshia86OP, a HX850 is plenty for that setup. Maybe?, but if you take into consideration EVGA say the GTX 780 requires a 600W or greater PSU, then according to NVidia's specification of the GTX780 power spec, another added into the system will require 250W, that is cutting it fine with an 850W PSU. Plus I have had the Corsair HX850W a while now so there will be some degradation of the PSU over that time I have been using it. I think I will be going for the Corsair 1200W to be on the safe side.
A lot of "myths" here re: Power requirements, here's the "real world" skinny, not stuff "I've read on the Net" (oh...and the Net is always right) ;) - 780's draw slightly more power than a 680 (stock clocks) - my 680 Classy's OC'd likely draw around the same power as the 780's Now, the Rig in my Sig could be considered a power hungry Rig, so why not test the power draw at the wall while looping Heaven: Results - peaks at 920W from the wall.....thats Tri SLi 680 Classy's and 3930K all OC'd With that being said my AX1.2kW has some headroom......your 850W is MORE than enough ;)
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dave0413
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Monday, June 24, 2013 8:58 PM
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Running 3770k and 2 gtx780 sli with seasonic x-850 psu.
Measuring with killawatt meter, never pulled more than 630w from the wall with full o/c folding both cards and smp at same time.
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RainStryke
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Tuesday, June 25, 2013 0:48 PM
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Ugh... Okay, here's a worst case scenario, using 3DMark11 (Artificial because it's not a game and it's not a power draw you will ever see in real games) http://www.tweaktown.com/reviews/5507/evga-geforce-gtx-780-3gb-superclocked-video-cards-in-sli/index22.html A max power draw of 775w. Using a benchmark that will pull far more power than any real game would, as well as a i7 3960X @ 4.7GHz and unspecified voltage on the overclock. Here we have a real world test using Far Cry 3 on a i7 3770K system @ stock. http://hexus.net/tech/reviews/graphics/55577-kfa2-geforce-gtx-780-sli/?page=10 A whooping 420w load power draw. Yes, AX1200 is flextronics and is actually a very solid unit from them. Yes Corsair does use OEM's to make their units, for their HX units they use CWT and they did a great job on them as well. They were silver certified, but later bumped up to gold certified in the recent generations. If you look at reviews, they actually did slightly better regulation than the Seasonic AX series units. Here in this review of the HX850 you can see how great of a PSU it is: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=153 Barely any ripple on the capacitors towards full load, which means no issues running towards the higher end load of the unit under the hot load tests: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=153 It's one of the best in it's class... Actually, the only other PSU i'd recommend over the HX850 right now is a AX860i platinum certified unit if you had the extra money. You get a 7 year warranty from either model, which is at least 2 years higher than any other manufacturer out there... Even Seasonic only offers a 5 year warranty on their name branded units. If you want a grossly over rated wattage for bragging rights, then just go ahead and get the LEPA 1600w unit and be rid of your worries that anything will tax your PSU and give you power issues. No reason spending a few dollars less on just a 1200w PSU if you are going to go ahead and get something that isn't even needed for your system anyway. http://www.newegg.com/Product/Product.aspx?Item=N82E16817494006 It's a better unit than the AX1200. LEPA 1600 Review: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=283 AX1200 Review: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=189
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comrade
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Tuesday, June 25, 2013 1:25 AM
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I'm running twin EVGA GTX 780's in SLI with a 3930K. I run a Cooler Master 1000 Watt PSU, and it overclocks and runs perfectly with that. With a Watt meter connected to the computer plug, I've seen it pull a bit over 900 Watts with both the twin GTX 680's I had before and now the GTX 780's overclocked, and running steady without a hitch.
Not an expert, but I'd say you're on the edge with the 850 Watt PSU.
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RainStryke
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Tuesday, June 25, 2013 1:49 AM
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comrade
I'm running twin EVGA GTX 780's in SLI with a 3930K. I run a Cooler Master 1000 Watt PSU, and it overclocks and runs perfectly with that. With a Watt meter connected to the computer plug, I've seen it pull a bit over 900 Watts with both the twin GTX 680's I had before and now the GTX 780's overclocked, and running steady without a hitch.
Not an expert, but I'd say you're on the edge with the 850 Watt PSU.
Not even close if you check his PSU quality, system specs and the reviews I posted. 900w from the wall on your system means that you are probably gauging the power draw from everything you use on your PC, including your monitor and anything else hooked up to the power strip. Even if it was from the PC it self... at approximately 80% efficiency, that's 720w to the system.
post edited by RainStryke - Tuesday, June 25, 2013 1:52 AM
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rjbarker
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Tuesday, June 25, 2013 4:39 AM
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^^^^^ Exactly, as said 920W from the wall....just tower..Gold rated so 80-90% efficiency...have a hard time believing a SLi780 draws the same as Tri SLi 680's !!!
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oshia86
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Tuesday, June 25, 2013 1:36 PM
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I'll try to do a test of my system when I get home. I'll be willing to bet the system is nowhere near 900w. Remember that, at least for Corsair, the power supplies are rated on the output side at 50c 24/7 (which I assume nobody here is getting that warm). So if you have an 850 watt 80% efficient power supply and you are pulling 800 from the wall, the power supply is only outputting about 640 of its 850 watts.
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RainStryke
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Tuesday, June 25, 2013 3:15 PM
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oshia86
I'll try to do a test of my system when I get home. I'll be willing to bet the system is nowhere near 900w. Remember that, at least for Corsair, the power supplies are rated on the output side at 50c 24/7 (which I assume nobody here is getting that warm). So if you have an 850 watt 80% efficient power supply and you are pulling 800 from the wall, the power supply is only outputting about 640 of its 850 watts.
Your HX850 is approximately 85% efficient at a 800w system load. At full load it pulls 1015w from the wall on a 853w system load. http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=153
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gr3yh47
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Re:EVGA GTX 780 2-way SLI PSU recommendations?
Wednesday, August 13, 2014 12:30 AM
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RainStryke
Ugh...
Okay, here's a worst case scenario, using 3DMark11 (Artificial because it's not a game and it's not a power draw you will ever see in real games)
A max power draw of 775w. Using a benchmark that will pull far more power than any real game would, as well as a i7 3960X @ 4.7GHz and unspecified voltage on the overclock.
Here we have a real world test using Far Cry 3 on a i7 3770K system @ stock.
A whooping 420w load power draw.
Yes, AX1200 is flextronics and is actually a very solid unit from them. Yes Corsair does use OEM's to make their units, for their HX units they use CWT and they did a great job on them as well. They were silver certified, but later bumped up to gold certified in the recent generations. If you look at reviews, they actually did slightly better regulation than the Seasonic AX series units.
Here in this review of the HX850 you can see how great of a PSU it is:
Barely any ripple on the capacitors towards full load, which means no issues running towards the higher end load of the unit under the hot load tests:
It's one of the best in it's class... Actually, the only other PSU i'd recommend over the HX850 right now is a AX860i platinum certified unit if you had the extra money. You get a 7 year warranty from either model, which is at least 2 years higher than any other manufacturer out there... Even Seasonic only offers a 5 year warranty on their name branded units.
If you want a grossly over rated wattage for bragging rights, then just go ahead and get the LEPA 1600w unit and be rid of your worries that anything will tax your PSU and give you power issues. No reason spending a few dollars less on just a 1200w PSU if you are going to go ahead and get something that isn't even needed for your system anyway.
It's a better unit than the AX1200.
LEPA 1600 Review:
AX1200 Review:
thanks for all of this really good info would appreciate if you can confirm my conclusion based on this. I'm looking at running 2-way SLI EVGA SC ACX 780s i have an i5-2500k OC to 4GHZ - The vcore on my 2500k is auto and floats around 1.35v (is this too high for a 4ghz OC?) My mobo is an MSI z77a-g45 thunderbolt 2x corsair vengeance 8GB DDR3 1600 RAM an SSD and a 1TB 7200RPM HDD like 8 LED fans I have an EVGA SuperNOVA 750W modular 80+bronze PSU. I should be ok right? edit: also sorry for the minor necro. seems appropriate here instead of starting a new thread
post edited by gr3yh47 - Wednesday, August 13, 2014 12:40 AM
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