is a 650W PSU capable of powering 2 gtx 1080ti's?

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sm620

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Oct 18, 2012
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I currently have a 650W PSU, but I'm thinking about buying a second GTX 1080ti, but I have a feeling I need a bigger power supply. the tdp was around 250W for each card, so that would make 500W. My CPU is an i5 4670K. I put my specs into a calculator and it suggested a 700W, but I already have a 650W. I thought they were probably over estimating.
If anyone has any experience with this type of configuration or any ideas on the matter, advice is welcome. I've done a lot of research, but I just don't want to buy another one unless I absolutely have to as my current PSU is only a few months old.
 
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Well you could certainly be right, but his 650 watt PSU might also only be putting out 550w on the 12v rail as well. We don't know, no details in this thread... @OP.

 
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evga's website says max power draw of 250W, but I don't run it at the max 120% TDP, so if that number is referring to the actual maximum then I should be drawing less. I currently have mine running at 90% power target because I was able to leverage temps with an overclock best that way. My card did not benefit at all from more voltage. I don't know how the second one will be on the fine tuning. Also I'm not sure what the mathematical relationship between TDP and power draw is in this case, but less TDP should also mean lower wattage from the PSU.

https://www.evga.com/products/product.aspx?pn=11G-P4-6593-KR
 
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Well, each of those cards is designed to have up to 300W of power available to them with a claimed max power draw of 250W from the EVGA site . So the question becomes do you hook up 1500+ dollars of graphics cards to $110.00 worth of power supply that doesn't actually have two 8 pin and two 6 pin PCIe connectors (that PSU has 3 x 8pin (6+2) PCIE so you'll be converting one molex to a six pin I'd assume)?

It would probably work. I wouldn't personally do it with those margins for error, but I'm not paying for the cards either.
 
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I also have 1 7200 RPM HDD, and 2 SSD's; one 500GB, the other 125GB. I have ccorsair vengence 8GB DDR3 ram(I think the clock speed on that was 2400) As far as the fans go, I have 1 80mm, two 120mm, and one closed loop liquid cooler for the CPU.
I looked online and the maximum for the SSDs and HDD should be around 20W total.
I think the fans might take up around 15W, but I don't know for sure.
The pump probably doesn't use more than 10W.
The internet said about 3W for each RAM stick, but mine is high clock speed, so I'll double that to be safe, so I'll account for 12W
The CPU cshould run at 132W according to https://www.bit-tech.net/reviews/tech/intel-core-i5-4670k-haswell-cpu-review/6/
The GPU at 250W each
So 677 for the maximum power draw, but I don't think my GPU's will pull 250W each because they are not overvolted. It does run at 2000Mhz though, so that increases the current which according to Power=IV would increase the wattage.

Does that seem right? am I missing anything?
 
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Basically the latter PSU is a newer design, gets slightly higher marks but both units are very nice PSU's for the money at play. The latter link is fully modular vs semi modular which might spare you a few extra cables cluttering things as well.
 
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I would not pay $200 for a PSU. And I would not downgrade to a mediocre PSU like the GQ either. The G3 is much, much better than the GQ. I'd rather run the 650 G3 at 100% load than the 1000 GQ at 65%.

If you're planning to get a new PSU, maybe consider something like an RM850x https://www.newegg.com/Product/Product.aspx?Item=N82E16817139141&cm_re=850w_power_supply-_-17-139-141-_-Product

Quality is onpar with the G3 at least. And you don't need 1000W, 850W should be fine. If we assume a high estimate of 300W for each GPU, then we're probably looking at 700W power draw when heav

If you insist on 1000W, get the Corsair RM1000x then.

Edit: Of course, if it's in your best interests you could always just snag a 1000W PSU under $100. Won't be as high quality as the G3 but still could get the job done.
 
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I have a 550W corsair power supply that I"m not using. I replaced it after it got close to 5 years old which was probably 6 months ago. I wonder if I should just use that to power one of the graphics cards then pick a bigger one up on a good sale? The RM1000X Watt one is on sale right now, but I haven't gone with corsair in a while because of the higher DOA rates in the reviews and I had blue screen issues with my last one and the one before had fan a loud fan spinnup sound. it could just be bad luck, but I've been pretty happy with my current EVGA one so far.

I think the 1000W would be better because it give me a little more room for upgrades and the 2 GPU's would sit better on the efficiency curve. Although I think the future architectures will draw less power in the future, I think it would be nice to have such a large power supply. I do a lot of engineering stuff and I don't really know what my hardware will look like within the next 10 years.
 
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Thanks for all the help. As it turns out I won't have to use two PSU's. I found the G3 1000W for $120 dollars, so I'd say thats a pretty good deal. It's cheaper than the others and my first choice.

I'll pick the solution by what would be most beneficial for a visitor to read after reading the title.
 
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