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*OFFICIAL*GTX 295 Thread! - Page 16

post #151 of 799
Quote:
Originally Posted by ljason8eg View Post
46A at 12V is 552W. My whole system doesn't draw that with one card. 850w is fine for quad SLI.
I saw you all were talking about power required for Quad SLI. Well let me tell you 850W may or may not cut it. Probably not. It all depends on your 12V rails. You need a min of 650w PSU with 46amps on the 12v rails. Here is a link below from EVGA.

http://www.evga.com/products/moreinf...017-P3-1291-AR


I am currently using a Kingwin Mach 1 1000W with six 12v rails. Totaling out to 150amps on the 12v rails. Hope this helps.

http://www.tigerdirect.com/applicati...917&CatId=2535

Specifications
Wattage: 1000-Watt

Special Features: SLI Certified, Modular, 80PLUS

Fan: 150 mm

+3.3V: 24 A

+5V: 30 A

+12V 1: 20 A

+12V 2: 20 A

+12V 3: 20 A

+12V 4: 35 A

+12V 5: 35 A

+12V 6: 20 A

-12V: 0.5 A

+5VSB: 5.0 A

20+4-Pin Connector: 1

4-Pin P4: 1

4-Pin/8-Pin EPS Connector: 1

6-Pin PCI-Express Connector: 2

6-Pin/8-Pin PCI-Express Connector: 2

4-Pin Floppy Connector: 1

4-Pin Peripheral Connector: 8

SATA Power Connector: 8
post #152 of 799
Quote:
Originally Posted by Tweex View Post
I saw you all were talking about power required for Quad SLI. Well let me tell you 850W may or may not cut it. Probably not. It all depends on your 12V rails. You need a min of 650w PSU with 46amps on the 12v rails. Here is a link below from EVGA.

http://www.evga.com/products/moreinf...017-P3-1291-AR


I am currently using a Kingwin Mach 1 1000W with six 12v rails. Totaling out to 150amps on the 12v rails. Hope this helps.

http://www.tigerdirect.com/applicati...917&CatId=2535
You do not have 150A on the 12v rail as that would mean you have 1800w output on the 12v rails alone, which isn't correct. You don't just add up all the 12v rails.

The EVGA requirement is overstated by 100w easy according to what my wattage readings from the wall are. My 750w PSU would cut it a bit close in quad SLI, an 850w would have zero problems unless you were running a ton of high power draw fans at full blast.
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post #153 of 799
I guess I worded it wrong. Didn't mean 150amps total on the rails. Sry my mistake. All I am trying to say is 850W may cut it at stock speed but if you overclock those 2 cards you may have some issues. I would honestly have to say 1000W min for SLI 295 but this is my own opinion.

P.S. According to my math , correct me if I'm wrong...if EVGA did overstate by lets say 100W that still puts it at 550W which comes out to be 1100W total. Now you aren't going to use all of that yes but 850W leaves no head room IMHO.
Edited by Tweex - 4/14/09 at 10:17am
post #154 of 799
Quote:
Originally Posted by Tweex View Post
I guess I worded it wrong. Didn't mean 150amps total on the rails. Sry my mistake. All I am trying to say is 850W may cut it at stock speed but if you overclock those 2 cards you may have some issues. I would honestly have to say 1000W min for SLI 295 but this is my own opinion.

P.S. According to my math , correct me if I'm wrong...if EVGA did overstate by lets say 100W that still puts it at 550W which comes out to be 1100W total. Now you aren't going to use all of that yes but 850W leaves no head room IMHO.
There's really not an opinion to the matter, it's a black and white issue. I just fired up linpack and furmark at the same time (which is way more power draw than you'll ever get in games/folding), with my card overclocked and overvolted to 1188mv just to increase power consumption. It drew 690w from the wall. I'll assume the PSU is 80% efficient, so that would be 552w that the PSU is sending to the components. 850w would clearly work even in this extreme test.

EVGA's numbers are for the whole system, not just the card. It doesn't double with 2 cards. Have you ever checked your power consumption at the wall to see what you're really using?
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post #155 of 799
No as long as the lights come on there is enough power. Ty for explaining it. Rep +1
post #156 of 799
Quote:
Originally Posted by Tweex View Post
No as long as the lights come on there is enough power. Ty for explaining it. Rep +1
Lol no problem

I'd just hate to see someone buy a new PSU that doesn't need to. And yes, it's fun when you draw too much power and trip the breaker
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post #157 of 799
Thread Starter 
Still debating if I want to mess with W/C or not. Yesterday, I tested my 295 with the same clock's as always 675/1500/1210 100% stable, with 70% fan speed. With a Antec Spot Cool blowing on the back of the PCB on HIGH setting.

It dropped my temps from 3-4c with just the spot cool. In GTAIV, it also dropped the temps from about 2-4c on LOAD.

SO the spot cool helped, and helped drain out the noise of the 295's fan, but I also added a fan on HIGH, but It not as loud strange, but a fact.

I'm debating between W/C or not.. if I go w/c, it be 295 loop only, as my TRUE does a dam fine job by its self. Debating between koolance, with the nice block as you can see your coolant inside, or the HEATKILLER block, which I've heard many good things about. Hmm.......
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post #158 of 799
Quote:
Originally Posted by ipod4ever View Post
Those are some good temps, I have a hard time keeping mine below 70c at 700/1500/1100. and 75 fan

What are your ambient room temps?
I'm going to assume you mean the temperature in my room, if so I'd say cold like winter cold except not negative Celsius Lol.
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post #159 of 799
690-1487-1101
Screenshot
post #160 of 799
Thread Starter 
Quote:
Originally Posted by gnolnats View Post
690-1487-1101
Screenshot
Added mate!
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