GTX295 Which PSU?

[ChocoLab]

Building a new core i7 system with a Zotac GTX295 and want the option to add another GTX295 down the track when necassery, my question is how much power will I need to run 2 GTX295's? Is the following PSU sufficient?

http://www.newegg.com/Product/Product.aspx?Item=N82E16817371012

Thanks in advance

 

[Twoboxer]

More than sufficient, and its been reviewed as a fairly competent psu:
http://www.xbitlabs.com/articles/coolers/display/10-1kw-psu-roundup_17.html#sect0
although as you read it there are some glitches that may steer you toward the Corsair HX1000 instead.
http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/6951-corsair-hx1000w-power-supply-review-11.html

According to nVidia, max power consumption for a 295 is 289W
http://www.nvidia.com/object/product_geforce_gtx_295_us.html
. . . times 2 is 580W . . . plus 200W-300W for the rest of the system equals 780W-880W so I guess 1000W is not totally absurd for this specific configuration.

But running quad-sli (2x295) may well be. Take a look at some 2x295 benchmarks and you may find its something you wouldn't do, depending on your screen resolution.

 

[ill b ben]

It will b enough.

although id go for a corsair 850 tx wich would still grant you the option of a second 295 down the road

 

[delluser1]

although id go for a corsair 850 tx wich would still grant you the option of a second 295 down the road

Are you saying it couldn't be done with the 1000 watt Antec ?

 

[ill b ben]

Are you saying it couldn't be done with the 1000 watt Antec ?

Euhm.. no

imo a 1000 watt psu is a waste even for such setups, thats why id rather go for the corsair 850tx

 

[ChocoLab]

Decided just to run a 850W PSU and stick with the 1 GTX295, any recommendations on the best 850W from the list below?


Antec 850W TruePower Quattro ATX & EPS 12V Power Supply, Modular Cables, Four 12V Rails, 80Plus Cert

Corsair TX-850 ATX Power Supply 140mm fan

Thermaltake Tough Power 850W Q-FAN PSU


Cheers

 

[Twoboxer]

Comparing these reviews:

http://www.hardwaresecrets.com/article/555/10

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=126

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=147

I'd buy the Corsair. As usual

 

[ChocoLab]

Cheers for the help, actually made a mistake on the corsair I meant the HX-850 Modular

 

[darkvine]

850 watts is enough for 2 GTX 295's though 900 if you play to do a ton of overclocking. A 1000 watts is more like 3 GTX 285's in tri-sli and a 9800 GT for phyX.

 

[Twoboxer]

Cheers for the help, actually made a mistake on the corsair I meant the HX-850 Modular

Same-same, maybe even better lol:

http://www.hardwaresecrets.com/article/741/10

 

[m4rmite]

just for info for you regarding power draw
i have a e8500 @ 4.275ghz 2x2gig ocz ram gigabyte ep45-ud3lr mobo and a palit gtx 295 @ 676/1457/1132
3 sata II hdd 1 dvd drive 1x super flower fan controller cooler master cosmos s case with 6 x 120mm fans and teh case has a 200( or 220) mm fan, and a ocz vendetta 2 cpu cooler
when i run my rig on folding at home 100% on the cpu and both gpu cores it pulls 400w ( 395-405) consistently.
i bought a hiper bronze 1000w psu in case i ever went sli etc in the future ( would need new board) and looking at the power draw could have >>probably<< run the system on my ocz 600 watt psu that i already had
anyhow if the gtx 295 pulls a max of 289w on top of a my system it would be 689w approx..
a 850w would be a close call for sli if you work on the 80% efficiency theory but for a single gtx 295 you will be ok...always check the ampage kicked out on the psu just to make sure

oh the power draw also includes a 22" lcd monitor which obviously doesnt get powered by the psu

 

[obsidian86]

2 gx295s use 698 watts at full load at normal clocks

 

[delluser1]

2 gx295s use 698 watts at full load at normal clocks

Where do you come up with these numbers ?

 

[obsidian86]

it was done on a review my friend did for a local pc magazine comparing crossfire an sli setups

 

[delluser1]

it was done on a review my friend did for a local pc magazine comparing crossfire an sli setups

So the system you're friend used drew 698 watts from the wall.
Tom's did a review of the 295 in SLI, thier system only drew 596 watts from the wall.
Niether let's us know how much power the cards used.
Xbit labs does test the power that the card itself uses.
http://www.xbitlabs.com/articles/video/display/evga-geforce-gtx295_7.html#sect0

SLI
http://www.xbitlabs.com/articles/video/display/gf-gtx295-sli_5.html#sect0