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GTX 580 SLI, will my PSU handle it ? - Page 2

post #11 of 17
tl;dr version:
It's for sure worth a try w/the current unit. The absolute worst-case scenario would be that you would need to drop the OC on the card slightly if you were folding on both gpu and cpu at the same time.

More details:
I would say the only way you'd even get close to 850W is if you:
1) *HEAVILY* overvolted and oc'd both cards, and did the same w/your CPU, and
2) Tried to simultaneously run like Super Pi, and Furmark (with an override on the current protection).

Even then I rather doubt you'd have a flat-out failure/shut down, I think you'd just perhaps get some voltage droop on your 12V+ rail, maybe some additional ripple, which could potentially wear out your components a little faster.

However, folding on both the CPU and GPU would be doing something similar, and hence could potentially put you somewhat close to 850W (again, only if you're heavily OV/OC'd on both GPU's and CPU), so if that is something you regularly do, I'd say it'd be smart to keep an eye on your 12V rail, make sure it isn't causing bad voltage droop (i.e. say dropping to 11.5V or less) and if it does ... you might wanna go a bit bigger.

As long as you're just doing normal stuff i.e. not TRYING to tap out your PSU by maxing usage of CPU and GPU at the same time, you should be totally fine w/the 850W unit ... esp. the Corsair, which is a fine PSU.
Edited by brettjv - 7/17/11 at 10:20am
    
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post #12 of 17
Quote:
Originally Posted by Phantom_Dave View Post
I'd rather be safe than sorry. Also, I didn't say just how many extras I'm getting. Maybe I'm planning on watercooling with 17 fans 8 HDD and 5 optical drives, 8 USB ports being used, and 2 externals, hehe. Plus PSUs can lose up to 20%-30% of their rated power over age.

I'd rather have it and not need it than need it and not have it.
OP would say that if he did. You're not helping. If OP wanted to run 20 HDD and 30 fans he would say so.
post #13 of 17
im running overclocked gtx 480, overclocked 1055t at 1.41v 6 fans, 1 hdd fine.
    
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post #14 of 17
Quote:
Originally Posted by DSF_x View Post
im running overclocked gtx 480, overclocked 1055t at 1.41v 6 fans, 1 hdd fine.
Exactly, and the 480 is way more power hungry than the 580. Case closed.
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post #15 of 17
Look at my Sig rig. You'll be fine...
post #16 of 17
Quote:
Originally Posted by Segovax View Post
OP would say that if he did. You're not helping. If OP wanted to run 20 HDD and 30 fans he would say so.
If you read my first post, I said, "I concur." 850W is plenty for the average PC with SLI GTX580... I explained why "I" went bigger.

You're not helping... and 1000W is not really overkill for this situation if you plan to use the PC for 5 years. What's the price difference between a quality 850W and a quality 1000W? Not much... especially for an enthusiast. SLI GTX580 definitely falls under the enthusiast category.

If you're trying to pinch pennies, then SLI GTX580 is not for you to begin with.
post #17 of 17
Thread Starter 
Awsome, thx guys. Now i feel more secure with my PSU

And i don't plan to do any folding/furmark or to add anymore composants to my PC anytime soon. (don't need more HDD or fans, or WColling etc)

CPU will stay @ 4.00. I might OC the GPUs, but just a little OC.

PS : i'll defenitly keep my HX850. I MIGHT change it in a couple of months just for the fun to have a new toy, but for the moment i don't want/need to.
Edited by Grindhouse - 7/17/11 at 10:28am
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