PSU in regards to Dual graphic cards:

[Rjsurp]

Hello,
I wanted to double check my calculations for what I would need for a PSU to run my Pc with the following:

Asus Sabertooth x58 mobo(i can provide further specs if needed)
6 gigs RAM
1 LG Blue-Ray/DVD/
2 Western Digital Velociraptor (300GB ea). Raided; stripped or 0
1 Nvidia GTX580 (for main Graphics card)
1 Nvidia GTX560 ti (just for physx calculations)
1 Cooler Master V8 heatsync
3 140mm fans

What do you suggest for PSU rating, I am thinking at least 800-1000?

 

[tlmck]

Any good quality 850 watt or better unit of at least Bronze or even Gold rated from Antec, Seasonic, Corsair, XFX, or Silverstone, would work fine. Just stay away from the low end Corsairs(builder series) if they even make that high of wattage. XFX are pretty good deals right now as they are trying to build up their name. I have cracked one open and it looks like pretty good stuff.

You could go up to 1000 watts if you wanted with no worries. Modern certified PSU's are made to be efficient at all load levels.

Don't know what your shopping options are, but here are some examples from Newegg. http://www.newegg.com/Product/ProductList.aspx?Submit=Property&N=100009250&IsNodeId=1&Description=power%20supply&Manufactory=1697%2C2031%2C1516%2C1669%2C1459&PropertyCodeValue=1314%3A58429%2C4097%3A43843%2C4097%3A43845&bop=And&Order=PRICE&PageSize=20

 

[esrever]

750 should be enough.
could get away with less as the 560 will not be very loaded

 

[Rjsurp]

Any good quality 850 watt or better unit of at least Bronze or even Gold rated from Antec, Seasonic, Corsair, XFX, or Silverstone, would work fine. Just stay away from the low end Corsairs(builder series) if they even make that high of wattage. XFX are pretty good deals right now as they are trying to build up their name. I have cracked one open and it looks like pretty good stuff.

You could go up to 1000 watts if you wanted with no worries. Modern certified PSU's are made to be efficient at all load levels.

Don't know what your shopping options are, but here are some examples from Newegg. http://www.newegg.com/Product/ProductList.aspx?Submit=Property&N=100009250&IsNodeId=1&Description=power%20supply&Manufactory=1697%2C2031%2C1516%2C1669%2C1459&PropertyCodeValue=1314%3A58429%2C4097%3A43843%2C4097%3A43845&bop=And&Order=PRICE&PageSize=20

Excellent! I thank for your help this was perfect!
Cheers~

 

[Rjsurp]

750 should be enough.
could get away with less as the 560 will not be very loaded

Really!
I was thinking that it might, but going to the 800 watt or better would be a "better safe then sorry" type of decision!
Thanks for your response I'd like it if I didn't have to spend anymore money as I am already running the system with a 750 watt!
~Sweet!

 

[JackNaylorPE]

The 560 Ti is a huge waste for PhysX....a $50 GT 220 will do just fine......

Id suggest two 560 Ti's (40% more performance than the single 580 and they handle the PhysX load just fine.....son is upstairs playing Batman Arkham City at 1920 x 1080 on a 120Hz monitor w/ 3D glasses and PhysX using two of these OC'd to 980 Hz (formerly 1020, lowered to keep temps under 80C with fans on lowest setting).

http://www.pureoverclock.com/review.php?id=1201&page=17

And I use 850 watters for twin 560 / 579 / 69xx builds and with OC'd GPUs and CPU's the load climbs quite a bit

446 watts at 1017 Mhz up from 382 stock

The card draws 192 watts all by itself......so figure 512 watts just for the two cards when OC'd.

You could probably get by w/ 750 watter....but w/ the miniscule price difference between PSU's at these size ranges, Id arther heave the headroom for voltage stability.

750 watt XFX Core Edition $90 (9.5 jonnyguru performance rating)
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207015

850 watt XFX Core Edition $90 (9.5 jonnyguru performance rating)
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207011

750 Watt Corsair AX $170
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139016

850 Watt Corsair AX $190
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139015

 

[Rjsurp]

Yeah, I already have both the Gtx 580 that replaced the 560 ti as the main graphics card, now I just have the 560 ti sitting in a box, so I thought what the hell I might as well use for something! I would never spend that much on a card just for Physx, however you wouldn't want too much of a degradation between the cards only because of bottlenecking, (albeit physx won't demand that much).
I figured minimum PSU 800-850, but I was always told to leave headroom when upgrading, so that is why I figured between 850-1000 watts should do me.

~Thanks for your response, I appreciate it
Cheers!