Tyleryac
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I will be "Stepping Up" to 2x 1080 Ti to put in SLI. Would my current Corsair AX 760i PSU suffice in a 7700K machine? Or should I pick up something else?
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comrade
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Re: 1080 TI SLI PSU
2017/03/15 07:48:18
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Use the EVGA calculator that tells you what power supply you need. I think the calculator is a bit conservative, but I think you're probably going to want something a bit more than 760 watts. The 1080 series cards seem to use less power than the 980's. I had two of the 980 SC's in SLI and with an Intel 5930K and quite a few other items in my computer, I had a watt/amp meter on the PS plug and with an overclock on both the cards and the CPU, I did see it pull a bit more than 900 watts on rare occasions.
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TRClark911
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Re: 1080 TI SLI PSU
2017/03/15 07:53:57
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500 watts for the pair of cards?
Gonna single card for now.
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Cool GTX
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Re: 1080 TI SLI PSU
2017/03/15 08:25:40
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+1 what comrade posted Go here to check EVGA power meter http://www.evga.com/power-meter/ The hypothetical build I entered: 2 1080 Ti, Z170 MB, OC the CPU, 2- SSD & 2 mechanical HD = 1000W is recommended What is your current build you are stepping up from ? How many watts are you pulling with your current config ? My rule of thumb ---> I like to make sure the total possible load does not exceed 80% of the PSU rating Several items of your build are not known to us MB ? How many: mechanical drives SSD OC of CPU Water pump ? Fans Other cards
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karmadecoy
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Re: 1080 TI SLI PSU
2017/03/15 08:40:52
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I am getting my 2 stepped up 1080ti tomorrow. I have i7 4790k 3ssd 1hdd and that calculator told me that I should go with 850 watt PSU, which luckily I already have.
i7 - 4790 k @ 4.7GHz 32GB DDR3 @ 1903 Nvidia GTX 1080 TI FE SLI 
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Tyleryac
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Re: 1080 TI SLI PSU
2017/03/15 09:11:46
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Here's what I will be assembling.
7700K
32GB Ram
2x 1080Ti FE
1TB Samsung 960 EVO SSD
6 Corsair ML Fans
I went though EVGA's tool, and it came up with a 1000W
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strato79
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Re: 1080 TI SLI PSU
2017/03/15 09:14:42
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Depending on your CPU and GPU overclocks, you will definitely need a bigger PSU. My 5960x at just 4.0 Ghz and two 780 Ti's heavily OC'ed would overload my 1250w Seasonic. That's only when using LinX to load 15 threads and pushing Both GPU's With EVGA OC scanner so a little unrealistic normal scenario but I wanted to make sure I had the power if needed. I used a Kill-A-Watt meter and it would hit just over 1275 watts. But I have a LOT of fans(16) and water cooling and have 8 HDD's and a SSD and lots of small stuff that draws power like LED strips and stuff so I'm not the average user. I had to use my other 800w Seasonic to power just my second GPU or it would randomly restart on me. I'm not sure the difference in two 780 Ti's and two 1080 Ti's on power draw but I wouldn't go with anything less than 1000w depending on how high your OC's and how Many HDD's, fans and if you are water cooling or anything else that will draw power. Edit: I bought a 1080 FTW and loaded it up With OC scanner and the same 15 threads on My CPU, same computer/components and it would hit around 690-700w. I'm waiting on my 1080 Ti from step up and it should be here by next Wednesday so I'll have a better idea of what it will take to run 2 of them then. If you haven't bought a PSU by then I'll update what my system draws. That will give you a worst case scenario since I have a much more power hungry CPU and a lot more peripherals. If you buy before then, I'd most definitely go with 1000+.
post edited by strato79 - 2017/03/15 09:53:26
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Pathway
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Re: 1080 TI SLI PSU
2017/03/15 09:56:59
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My rig havent pulled out over 600W yet :)
im not overclocking much tho, only when benching
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bcavnaugh
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Re: 1080 TI SLI PSU
2017/03/15 10:07:50
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Running my 2 Cards @ Full Speed takes 700-720 Watts.
Max Peek was 745 Watts. I have a EVGA 1200P2 PSU.
I would go no lower than a 1000Watt PSU, myself that is.
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GTXMan
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Re: 1080 TI SLI PSU
2017/03/15 10:14:39
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I'm surprised. I used the power meter with 1080Ti, 7700k overclocked, Z270, 3 SSDs, 0 mechanical drives and 600w was the result on the low end.
But mine is going to be on water. I was originally gonna go for an EVGA 750w but then got a little paranoid and now planning on 850w. I think I'll stick with that as I may go SLI in the future though. It's like a $30 difference anyway.
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Pathway
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Re: 1080 TI SLI PSU
2017/03/15 10:56:13
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I finally got some use for my AX1200i but im surprised my rig doesnt need more juice
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bcavnaugh
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Re: 1080 TI SLI PSU
2017/03/15 11:32:22
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GTXMan
I'm surprised. I used the power meter with 1080Ti, 7700k overclocked, Z270, 3 SSDs, 0 mechanical drives and 600w was the result on the low end.
But mine is going to be on water. I was originally gonna go for an EVGA 750w but then got a little paranoid and now planning on 850w. I think I'll stick with that as I may go SLI in the future though. It's like a $30 difference anyway.
If you mean under water using a Custom Water Loop or Hybrid? Hybrid SLI an 850 would work but I would not overclock the GPUs very high. If a Custom Water Loop and you are going with SLI then I would not overclock the GPUs at all. You may want to think about a 1000Watt PSU for SLI Setup with a Custom Water Loop.
post edited by bcavnaugh - 2017/03/15 11:34:23
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Sajin
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Re: 1080 TI SLI PSU
2017/03/15 12:02:22
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GTXMan
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Re: 1080 TI SLI PSU
2017/03/16 08:40:37
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bcavnaugh
GTXMan
I'm surprised. I used the power meter with 1080Ti, 7700k overclocked, Z270, 3 SSDs, 0 mechanical drives and 600w was the result on the low end.
But mine is going to be on water. I was originally gonna go for an EVGA 750w but then got a little paranoid and now planning on 850w. I think I'll stick with that as I may go SLI in the future though. It's like a $30 difference anyway.
If you mean under water using a Custom Water Loop or Hybrid?
Hybrid SLI an 850 would work but I would not overclock the GPUs very high.
If a Custom Water Loop and you are going with SLI then I would not overclock the GPUs at all.
You may want to think about a 1000Watt PSU for SLI Setup with a Custom Water Loop.
No, right now it's just a custom loop with one 1080Ti (and CPU) being cooled. That's where I was saying I was originally going to just get the G3 750 and was surprised that Power Meter included the 600w as an option at all, as that seems low. But you're right, for dual SLI on water I'd probably step up to 1k. Having said that, unless the whole SLI experience gets a lot better at some point in the near future, I'll continue to have a single-card setup. Anyway, the 850 G3 is $109 on Newegg right now after $10 mail-in rebate, and the 750 is $108 with no rebate, so it's a no-brainer.
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armharm
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Re: 1080 TI SLI PSU
2018/02/05 20:02:14
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I am planning on running dual 1080 ti's in SLI on a 850w. Would it be possible to squeeze in an additional 1050 ti in there? maybe two 1050 ti's?
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HeavyHemi
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Re: 1080 TI SLI PSU
2018/02/05 23:15:41
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Folks, size your PSU so your maximum load is 80% or less of the continuous rating for the +12v. PSU's run most efficient between 40-75% of their max rating. A bit too big is far better than a bit too small. Spend the few $$ for a slightly oversized PSU. Quieter, cooler and longer lasting. armharm
I am planning on running dual 1080 ti's in SLI on a 850w. Would it be possible to squeeze in an additional 1050 ti in there? maybe two 1050 ti's?
We have no idea what the rest of your system is. Why are you desiring to risk over a $1000 dollars in GPU's?
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AHowes
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Re: 1080 TI SLI PSU
2018/02/06 07:59:16
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HeavyHemi
Folks, size your PSU so your maximum load is 80% or less of the continuous rating for the +12v. PSU's run most efficient between 40-75% of their max rating. A bit too big is far better than a bit too small. Spend the few $$ for a slightly oversized PSU. Quieter, cooler and longer lasting.
armharm
I am planning on running dual 1080 ti's in SLI on a 850w. Would it be possible to squeeze in an additional 1050 ti in there? maybe two 1050 ti's?
We have no idea what the rest of your system is. Why are you desiring to risk over a $1000 dollars in GPU's?
Be like over $2500 in gpu' s in today's world hehe. 1200watt plus I'd say.
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bcavnaugh
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Re: 1080 TI SLI PSU
2018/02/06 09:33:51
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armharm
I am planning on running dual 1080 ti's in SLI on a 850w. Would it be possible to squeeze in an additional 1050 ti in there? maybe two 1050 ti's?
Go No less than 1000 Watts for a TI SLI Setup + 1050 Ti or 1200 Watts for a 1080 Ti Duel Setup with Duel 1050 Ti Setup or Better 1300 Watts for your Four Graphics Cards
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AHowes
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Re: 1080 TI SLI PSU
2018/02/06 09:46:11
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I've metered the psu from the wall at over 500watts peakon load for my whole system with just a single 1080ti overclocked. Guessing another 250+ watts with another 1080ti.
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rusTORK
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Re: 1080 TI SLI PSU
2019/08/05 09:08:23
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Damn, EVGA Power Meter is so simple and fast. Just few clicks and i got recommended PSU - 850W.
I spend so much time in OuterVision and they don't even have my CPU. They have got wrong numbers for GPU memory and at the end they offered me 1200W PSU!
Here is config:
CPU: Intel Core i7-9800X (3.8@4.5 GHz, 165W TDP);
Cooler: Phanteks PH-14TCPE (3x140mm Fans);
MoBo: EVGA X299 Dark
RAM: 4x 8Gb DDR4-3600 (currently i have only 2x 8Gb)
GPU: 2x EVGA GeForce GTX 1080 Ti SC2 Gaming;
SSD: Samsung 970 Pro (512Gb, M.2);
HDD: SATA, 2TB or so with 7200 RPM (will get it later)
Case Fans: 3x120mm Fans
Basicly i was focused on 850W for 1x GPU just because i want to buy second GPU later (when price will drop). Second hande of course, so i have to invest in better PSU now to be able to use second GPU later.
But 1200W... really? I think i may need such CPU if everything will be overclocked (CPU and both GPU). And probably cooled by LN2.
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Cool GTX
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Re: 1080 TI SLI PSU
2019/08/05 09:38:21
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Also you should to check Amps for 12V & Number of power connectors you need to use in your Build I believe your i7-9800X can pull much more that the 165W TDP when you OC My SLI EVGA 1080 Ti FTW3 rig can pull over 700W under a heavy GPU load & I am not OC my CPU --> it is on a custom loop Good Guide if you have not seen it for the X299 Dark https://xdevs.com/guide/e299ocg/
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rusTORK
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Re: 1080 TI SLI PSU
2019/08/05 09:49:54
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Cool GTX
Also you should to check Amps for 12V & Number of power connectors you need to use in your Build
Yeah, i saw few Seasonic PSUs and there enought PCIe connectors (two per card). Cool GTX
I believe your i7-9800X can pull much more that the 165W TDP when you OC
I saw only one review and there was 243W. Cool GTX
My SLI EVGA 1080 Ti FTW3 rig can pull over 700W under a heavy GPU load
It's "stock" (100% power target) or OC? I saw TechPowerUp review of EVGA GTX 1080 Ti SC2 and one card pull 272W. NVIDIA's TDP is 250W, so +10% - 275W. Two cards probably will be 550W (stock). 250W for CPU and 2x 275W for GPU = 800W. Cool GTX
Good Guide if you have not seen it for the X299 Dark https://xdevs.com/guide/e299ocg/
This guide have more info then i can absorb. :) TiN is very smart man.
post edited by rusTORK - 2019/08/05 10:03:30
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Cool GTX
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Re: 1080 TI SLI PSU
2019/08/05 10:04:11
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I'm OC on the GPUs 
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HeavyHemi
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Re: 1080 TI SLI PSU
2019/08/05 12:49:19
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rusTORK
Cool GTX
Also you should to check Amps for 12V & Number of power connectors you need to use in your Build
Yeah, i saw few Seasonic PSUs and there enought PCIe connectors (two per card).
Cool GTX
I believe your i7-9800X can pull much more that the 165W TDP when you OC
I saw only one review and there was 243W.
Cool GTX
My SLI EVGA 1080 Ti FTW3 rig can pull over 700W under a heavy GPU load
It's "stock" (100% power target) or OC? I saw TechPowerUp review of EVGA GTX 1080 Ti SC2 and one card pull 272W. NVIDIA's TDP is 250W, so +10% - 275W. Two cards probably will be 550W (stock).
250W for CPU and 2x 275W for GPU = 800W.
Cool GTX
Good Guide if you have not seen it for the X299 Dark https://xdevs.com/guide/e299ocg/
This guide have more info then i can absorb. :) TiN is very smart man.
You've already pointed out that 850 watts is undersized for your application. "250W for CPU and 2x 275W for GPU = 800W." You should size your PSU so that under MAXIMUM LOAD, you do not exceed 80% of the continuous capacity of the PSU. A PSU is most efficient between 50 and 80% of its load capacity. You should be shooting for a solid 1000 watt unit.
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aka_STEVE_b
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Re: 1080 TI SLI PSU
2019/08/07 07:50:34
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Yeah, I try to give myself at least a 15% cushion above what is actually needed ?
..and this thread was necro'd from over a year & 1/2 ago ....
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HeavyHemi
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Re: 1080 TI SLI PSU
2019/08/07 12:24:17
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aka_STEVE_b
Yeah, I try to give myself at least a 15% cushion above what is actually needed ?
..and this thread was necro'd from over a year & 1/2 ago ....
Well of course. As I just stated a PSU runs most efficiently between 50-80% of its rated capacity. There's no reason at all to skirt the edge for power delivery, none. Runs cooler, more efficient. Of course you can go overboard. I find it easiest to use that simple rule of thumb, your maximum calculated load, plus 20%.
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