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670 SLI minimum PSU?

Michael_10

Michael_10

Michael_10

Associate
Joined
15 Jan 2010
Posts
978
Location
Scotland
Hi guys, quick question, currently I run one 670 with a Seasonic G series 550w. Think it would be pushing it to put another one in? It would run beside my 2500k. Just with all the cheap second hand 670's going on the MM it would be a good way to boost my FPS, but it's not going to be worth it if I'm having to upgrade the PSU aswell!
 
Michael_10 said:
Hi guys, quick question, currently I run one 670 with a Seasonic G series 550w. Think it would be pushing it to put another one in? It would run beside my 2500k. Just with all the cheap second hand 670's going on the MM it would be a good way to boost my FPS, but it's not going to be worth it if I'm having to upgrade the PSU aswell!
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I think that's pushing it if your overclocking, 220w + for each GPU 120w for the CPU.

It might just do it but it would be running flatout.
 
When i had sli 670's my power draw in some games reached as high as 550w total system. Id be looking at a quality 750w psu as a safe point. Also with sli the 2500k will be a cpu bottleneck in certain games.
 
Reading about and seeing everyone's comments I thought as much. Annoying as it would have been a cheapish way to boost my FPS! Will probably just have to hold off until the next generation of Nvidia GPU's are out now :(
 
550w is fine :)
You'll be drawing around 500w from the wall, that PSU can take 630ish and still be within spec.

My single 670+3770k overclocked takes 300w from the wall, and a stock 670 uses 150-170w.
 
its a seasonic, they are usually under-rated anyway. Go for it, it will be fine.

I've measured mine at the wall and the most I pull is 500w (Everything overclocked, running full) given that your PSU is probably around 600w you have headroom :)
 
My advice is never use minimum PSU but work out what power you need then add another 100 to 200 watts or it ends in tears.

and use a top brand PSU.
 
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johny dolan said:
My advice is never use minimum PSU but work out what power you need then add another 100 to 200 watts or it ends in tears.

and use a top brand PSU.
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He is using a top brand PSU, and his spec will be well within spec (of the PSU) with some left over. The ripple on that unit @100% load is still very very low, it's the ripple that will kill the cards. The PSU will have OCP built in and when overloaded will shut down without killing the rig.

The negatives of running a PSU at spec would be fan noise. I do agree with your above statment, only when buying the PSU in the first place. That being, half decent and above spec to allow for future upgrades, also has the potential benefit of running 0db.
 
Thanks for all the comments, I really appreciate everyone's views! I have read that my seasonic could maybe go a bit over, and some reviews have proved that, but then it's the problem of running that for a prolonged period of time!

If I see a cheap 670 I might take the risk, from what people are saying it would shut down before any serious damage would happen? If I don't see any cheap 670's I'll probably be inclined to wait for Maxwell and just buy the 870 or whatever they'll name it!
 
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