S2000Gan
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Does anyone know how many Amps on the 12V rail are needed for 770 Sli?
I've been trying to find out on the internet but so far all I've seen is that they say 42A for a single 770.
Thanks, S2kG
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rjohnson11
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 01:12:13
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Well think of the GTX 770 as a highly modified GTX 680. In such a case I can not recommend the Corsair HX650 you are now using. I highly recommend something much more powerful especially if you wish to overclock. A corsair HX1050 would be ideal.
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S2000Gan
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 01:37:42
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Was thinking maybe a EVGA NEX750G think 61A on the 12v rail is good?
All I know is my 650HX actually has a pretty high current capability for a 650W (52A)
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rjohnson11
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 01:44:47
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A 750 watt might be good enough if it supplies sufficient current.
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S2000Gan
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 01:49:12
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 02:25:45
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just barely, i would look at least at and 850w with 70amp rail
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rjohnson11
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 02:35:11
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Yes and most especially if the user wishes to overclock the CPU and GPUs. You always want some breathing space for future mods. agedrig
just barely, i would look at least at and 850w with 70amp rail
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trek554
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 02:56:27
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a system with an oced 2500k and oced 770 sli could potentially pull 675-700 watts under full load. realistically around 550-600 watts will be more common for most demanding games.
personally I would still go with high quality 850 watt unit if you dont have a psu already. 750 watts would be ok but its much better to have another 100 watts of wiggle room for future upgrades.
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S2000Gan
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 03:09:06
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I'm having a tough time finding a Fully Modular PSU from a brand I like with single 24pin. Corsair seems to have a number of Fully Modular PSUs with a split 24pin connector on the PSU side. (AX760 and Seasonic's SS-760XP2)
So far the only ones Ive seen are the EVGA NEX750 and the SilverStone ST75F-P 750W
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rjohnson11
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 04:11:51
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In that case go for the EVGA model, but if finances allow please go for a slightly higher wattage model.
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EVGATech_JaesonW
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 04:34:56
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To be safe, when adding a second card for SLI we suggest adding another 50% to the single card requirements. So for dual 770s, a 900w, 63a PSU should be plenty. You may be able to run it on less depending on the quality of the power supply, it just depends on how much hardware you have in your system.
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spixelspixel
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 04:51:28
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I never understand why people recommend power supplies which are way more than required. Your 650w is fine for 770 in sli with the rest of your system in your sig. I'd estimate with everything stock an aboslute max load of 450w with the cpu + 2 gpu's fully loaded. There's a reason the hx650 comes with 4 pci express connectors, it won't break a sweat. If you plan to highly overclock everything I'd recommend a high quality 750w, ideally you want to keep the psu under 75 percent load for maximum efficiency. It's not a must though, you certainly don't have to upgrade your power supply.
post edited by spixelspixel - 2013/06/28 04:57:25
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he77spawn
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 05:48:19
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I use a pc power and cooling 910 w and I am pretty sure ill go sli without a problem.
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jmcdermott81
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 05:59:53
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http://forum-en.msi.com/faq/article/printer/power-requirements-for-graphics-cards Personally, like others have said, a 900 should be enough.... Corsair has a 1050 for around $200 The EVGA 1300 is also a good choice -- I think it retails for $229 or so.... It is split on the 24 pin power though... I was able to run three 770's on a EVGA NEX 1000 with a slightly overclocked 3770k... One optical, 8 fans, a AIO water cooler, and was at times over 900-934 watts... I always figure GRAPHICS WATTS (TDP x 1.2) by however many you have, then add processor TDP at OC settings, then peripheals, etc.... In my case I was to close to the cpacity of the NEX 1000. Thankfully, this was just a experiment we had going that was not long term.... I always like to add 150-250 on top for stability and future use -- Again, even with the split 24 pin the EVGA is looking like a sure fire way to future-proof what you want to accomplish. And, besides it is always nice to support the home team, is it not? 
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he77spawn
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 07:00:35
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I agree jmc as of now im ok with power when I need another one ill buy a evga power supply
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wmmills
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 07:11:29
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EVGATech_JaesonW
To be safe, when adding a second card for SLI we suggest adding another 50% to the single card requirements. So for dual 770s, a 900w, 63a PSU should be plenty. You may be able to run it on less depending on the quality of the power supply, it just depends on how much hardware you have in your system.
+1... you have to take into account the efficiency of the psu your buying AND what its overall specs are. Most psu's run at there absolute best at the 50-70% level of there rated total, that's why people tell you to go so much higher. Running a psu to its limit for extended periods will destroy it and it can potentially take out other parts of your rig. You put crappy power in your rig, you have a crappy rig!! that's all there is to it cause everything starts at the psu. :)
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zenfoldor
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 09:25:17
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Get the AX1200 from corsair or the Seasonic 1000w Platinum. Both excellent PSUs, and both will be very efficient at that load. Remember efficiency(energy savings) isn't reached when you are topping our your PSU, you want roughly half load(is this right?) for maximum efficiency. Plus it is not MUCH more, I think the ax1200 is 230 bucks or something, you end up paying 30 dollars more and have a top tier PSU that is super efficient and nearly future-proof with a 7 year warranty and lower power usage.
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zenfoldor
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 09:27:13
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wmmills
EVGATech_JaesonW
To be safe, when adding a second card for SLI we suggest adding another 50% to the single card requirements. So for dual 770s, a 900w, 63a PSU should be plenty. You may be able to run it on less depending on the quality of the power supply, it just depends on how much hardware you have in your system.
+1... you have to take into account the efficiency of the psu your buying AND what its overall specs are. Most psu's run at there absolute best at the 50-70% level of there rated total, that's why people tell you to go so much higher. Running a psu to its limit for extended periods will destroy it and it can potentially take out other parts of your rig. You put crappy power in your rig, you have a crappy rig!! that's all there is to it cause everything starts at the psu. :)
YES!!!! Never go cheap on PSU, it is one of the most important parts for stability and longevity of itself and other equipments!!!
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lehpron
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 09:53:24
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S2000Gan
Does anyone know how many Amps on the 12V rail are needed for 770 Sli?
I've been trying to find out on the internet but so far all I've seen is that they say 42A for a single 770. I've helped so many on this subject, you need only look up anything I've posted and follow along.  For instance, read this and interpolate for your hardware, all links are included, except I'll toss in this one which shows a Sandy Bridge quad at 3.4GHz stock uses 93W (7.8A from 12v); overclocking is raises heat and power exponentially, so scale the numbers up to your overclock. Approximate power ratio = (overclock/stock) 2 I want you to do the math and get your own tailored number instead of depending on a generalization or exaggeration not based on your specs that most folks will give you. Remember, the nVidia/EVGA system numbers are based on a configuration they don't make public, so ultimately their numbers are just to tell you the minimums for liability and warranty, it isn't a functional minimum. Edit: But for the sake of simplicity (which I don't recommend as we don't know what configuration derived the system recommendations), if nVidia recommends 42A and 600W for one card and knowing each card draws 230W according to nVidia (dividing by 12v and we get 19.2Amps each), then simply add up those numbers: GTX770 SLI needs a PSU with 830W and a total of 61.2A.
post edited by lehpron - 2013/06/28 19:11:36
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trek554
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 18:20:44
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spixelspixel
I never understand why people recommend power supplies which are way more than required.
Your 650w is fine for 770 in sli with the rest of your system in your sig. I'd estimate with everything stock an aboslute max load of 450w with the cpu + 2 gpu's fully loaded.
There's a reason the hx650 comes with 4 pci express connectors, it won't break a sweat.
If you plan to highly overclock everything I'd recommend a high quality 750w, ideally you want to keep the psu under 75 percent load for maximum efficiency. It's not a must though, you certainly don't have to upgrade your power supply.
um because it makes more sense than to push a psu really hard. and my 2500k at 4.4 and slightly oced 660 ti will pull 320 watts at the wall in some games so around 270 real watts. swap my gtx660ti for 2 gtx770 cards and he is easily pulling over 550 peak in demanding games just on stock gpu clocks. so yes it would work but no way I would run that system on a 650 watt psu as I like to have more room to oc or for future gpu upgrades.
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trek554
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 18:25:12
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zenfoldor
Get the AX1200 from corsair or the Seasonic 1000w Platinum. Both excellent PSUs, and both will be very efficient at that load. Remember efficiency(energy savings) isn't reached when you are topping our your PSU, you want roughly half load(is this right?) for maximum efficiency. Plus it is not MUCH more, I think the ax1200 is 230 bucks or something, you end up paying 30 dollars more and have a top tier PSU that is super efficient and nearly future-proof with a 7 year warranty and lower power usage.
now that is bat**** crazy overkill for him. a high quality 750 watt psu is fine and an 850 watt high quality unit would give him lots of breathing room. 230 bucks for a psu in his system is at least 130 bucks completely wasted.
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jmcdermott81
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/28 18:46:08
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Once again.... In a setup with three 770's stock and a slightly overclocked 3770K I pulled around 900-930 watts at full load... Using EVGA NEX 1000 PSU.... Not much room, but doable... OP is fine for now, upgrading in the future may cause problems.
I do not know why some say to add so much....
If you google PSU calculator there are many on the WEB.... OCN, etc... 1200 Watt platinums are nice, but not geared to SLI and Crossfire setups IMO, rather HIGH END ultra 'power' (no pun intended) users.
That being said, PSU's are relatively cheap, but overkill (too much watts) does not HELP, but rather hinder the sytstem. Linus from NCIX has talked about this many times...
Note: I would not run the three 770's on the EVGA 1000 with the 3770K for long as I like to have room to grow, but it does work with tri sli 770's.
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S2000Gan
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/29 00:07:49
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rjohnson11
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/29 00:58:04
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Leave yourself plenty of breathing space. Go for a model like the HX1050 from Corsair. Alternatively go for the EVGA SuperNova 1000.
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spixelspixel
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/29 05:09:56
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jmcdermott81
Once again.... In a setup with three 770's stock and a slightly overclocked 3770K I pulled around 900-930 watts at full load... Using EVGA NEX 1000 PSU.... Not much room, but doable... OP is fine for now, upgrading in the future may cause problems.
I do not know why some say to add so much....
If you google PSU calculator there are many on the WEB.... OCN, etc... 1200 Watt platinums are nice, but not geared to SLI and Crossfire setups IMO, rather HIGH END ultra 'power' (no pun intended) users.
That being said, PSU's are relatively cheap, but overkill (too much watts) does not HELP, but rather hinder the sytstem. Linus from NCIX has talked about this many times...
Note: I would not run the three 770's on the EVGA 1000 with the 3770K for long as I like to have room to grow, but it does work with tri sli 770's.
How did you get that 900w reading? From the wall? If so, then assuming your psu had 90 percent efficiency at that time then only 810 watts is being loaded on the power supply. This is why people often way overestimate the power needed and a fact all review sites fail to mention in their 'power consumption' tests. AC is not = to DC which is how a power supplies capacity is rated
post edited by spixelspixel - 2013/06/29 05:12:40
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S2000Gan
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/29 12:35:35
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rjohnson11
Leave yourself plenty of breathing space. Go for a model like the HX1050 from Corsair. Alternatively go for the EVGA SuperNova 1000.
the HX1050 isn't full modular though right? Looking for a PSU I can sleeve without having to open. As for the SuperNova 1000, it does look like the best option but I would prefer getting the cheaper NEX750 if possible.
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trek554
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/29 13:03:47
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rjohnson11
Leave yourself plenty of breathing space. Go for a model like the HX1050 from Corsair. Alternatively go for the EVGA SuperNova 1000.
SuperNova line is junk and actually failed the hardocp review which I have never seen a psu costing more than 50 bucks do. and again even a high quality 850 watt unit will give him plenty of breathing room.
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S2000Gan
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/29 13:39:40
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trek554
rjohnson11
Leave yourself plenty of breathing space. Go for a model like the HX1050 from Corsair. Alternatively go for the EVGA SuperNova 1000.
SuperNova line is junk and actually failed the hardocp review which I have never seen a psu costing more than 50 bucks do. and again even a high quality 850 watt unit will give him plenty of breathing room.
I only saw the review for the 1500W on hard ocp. Doesn't mean the whole line is bad.
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wmmills
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/29 13:50:10
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S2000Gan
rjohnson11
Leave yourself plenty of breathing space. Go for a model like the HX1050 from Corsair. Alternatively go for the EVGA SuperNova 1000.
the HX1050 isn't full modular though right?
Looking for a PSU I can sleeve without having to open.
As for the SuperNova 1000, it does look like the best option but I would prefer getting the cheaper NEX750 if possible.
checkout Coolermaster new V line. Made by Seasonic and are excellent units. http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=344
MOBO: EVGA x299 Dark, CPU: I9 10900X, RAM: Patriot Viper RGB 3600 32gb, SSD: Samsung 860 EVO 1TB, M2: Samsung 970 EVO+ 1TB, PSU: CoolerMaster M2 1500, CPU HSF: EVGA 240 CLC HSF~ P/P EK Furious Vardar, G-CARD:EVGA RTX3090 FTW3 Ultra Gaming w/Hybrid kit and Noctua IPPC 3000 P/P, CASE: LIAN-LI PC-V2010B w/ Window mod, OS: Windows 10 Pro 64bit, MON: Alienware AW3821DW New EVGA product? Register it NOW with this link: http://www.evga.com/register/default.asp?affiliatecode=4QFQRAMOII Help Our Vets From K-2! [link=https://strongholdfreedom
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S2000Gan
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Re:How many Amps on the 12V rail are needed for 770 Sli?
2013/06/29 17:22:28
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:'( RIP EVGA GPUs :'( 2009(9500 GT) - 2019(RTX 2070)
My Rig: CPU i7-9700K Motherboard Asus Maximus XI Code RAM 32GB G.Skill Trident Z
Graphics Card EVGA GTX 2070 Power Supply Corsair RM850x
Case Fractal Design Define R6 CPU Cooling XSPC Raystorm & 2x 240mm Radiators
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