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850 watt PSU good enough?
- Thread starter polonyc2
- Start date
- Joined
- Apr 25, 2001
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- 15,712
That PSU will be more than enough for your rig.
Ahem I assume anandtech's measurements are based on DC power from the wall, so assume at least 10% less power on the actual psu. Second the realistic load on a game shows 620w. I'd guess realistically, you'll never go over about 560-570w even with dual sli GTX 580's. This is exactly why I think most people massively overkill on psus.
Anands numbers as hybry said are for SLI. So you won't be drawing that much.
The difference between their 580 sli and 580 config is 325 at max load. The 260 is 336 at max load. Add that up and you get 661 watts at the plug. THe HX850 is 80plus. so 80% of 850 = 680.
Seems to me you'd be cutting it pretty close. Not sure if all my half-assed math is correct, but I'd be concerned if it was my system/wallet.
Running a card as a dedicated physx card isn't much different than running SLI, you just might be able to run a slightly lower power draw card.
The difference between their 580 sli and 580 config is 325 at max load. The 260 is 336 at max load. Add that up and you get 661 watts at the plug. THe HX850 is 80plus. so 80% of 850 = 680.
Seems to me you'd be cutting it pretty close. Not sure if all my half-assed math is correct, but I'd be concerned if it was my system/wallet.
Running a card as a dedicated physx card isn't much different than running SLI, you just might be able to run a slightly lower power draw card.
Dangman
Ninja Editor SuperMod
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- Dec 15, 2005
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No. 80PLus or PSU efficiency has NOTHING to do with the PSU's output capability:
The Corsair 850TX can provide up to 850W of power. Since it's 80Plus rated, that means that it draws at max 1050W from the wall.
Actually since it's 80plus silver, it should draw a maximum of 1000w at full load. Of course I think you can overload it a bit safely too, most high quality psus handle overload just fine for momentary periods, another reason I think people overkill on psus. It's like the seasonic 400w fanless, that thing could easily run 600-700w loads if there is enough cooling, but since it's fanless, it's rated far lower.
didn't think of it that way but I think you're right...the PSU is detecting 2 video cards and has no way of differentiating between SLI and PhysX card...so in reality I would be running SLI and would have to have a power supply that can handle it
with all the back and forth I'm still confused as to whether or not I should get a 1000 watt PSU or just keep the 850
Dangman
Ninja Editor SuperMod
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You'll be fine with the 850W PSU. Just don't OC the GPUs.
My bad, forgot to take in account that was power draw from the wall.
Still as Danny said, you should be fine as long as you do not overclock. I would go as far as to say you will be fine as long you keep it all at stock votages, so can still do a mild overclock.
Still as Danny said, you should be fine as long as you do not overclock. I would go as far as to say you will be fine as long you keep it all at stock votages, so can still do a mild overclock.
laithmeister
Weaksauce
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- Oct 9, 2010
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- 74
Plenty.