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980 ti Classy. PSU advice.

MrCSW

MrCSW

MrCSW

Associate
Joined
2 Dec 2009
Posts
107
Hi.

Im waiting on my arrival of an EVGA 980ti Classified.
Looking at the specs online its max power draw is 300W.
Which seems quite high to me.

Im also due to upgrade my PSU (corsair hx850-older model)
And was leaning toward an EVGA p2 850w.

If i was eventually to upgrade to SLI 980ti classifieds, which should draw around 600w.
would this be borderline for an 850w psu? should i get the 1000w straight off the bat?.

Regrads
Callum
 
You will pull 550-650W at most. But it's your money (and that's a lot of it). If you feel you need 1000W, which is £35 extra, then be my guest. I wouldn't have an issue going SLI with my setup (P2 850W). I suppose you are also running an angry CPU... But in any case, I would be suprised if you pulled more than 700W all overclocked.
 
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Either way if he's buying a new PSU and has the money for two 980Tis, better to get 1Kw :P
If Corsair Link is even remotely realiable, I'm pulling 500W with just one card.
 
I went for the EVGA p2 1000w platinum.
i believe its a similar unit to that Superflower peahead... But double the warrenty :D
 
Efficiency nosedives when you run near to load also. I use a AX860i Digital with the same DSP as the 1200AXi on a single 980 and will for Pascal. You onlt get 92% Platinum at 50% load i believe on some.


Lower fan noise also, At 430w my PSU is 92% efficient and silent.
 
andybird123 said:
At the wall yes, but PSU ratings are on the PC side so will be 10-20% below that value
Click to expand...

20%?

Sure, if you're using an 80 plus bronze rated psu. They used a platinum psu in that review which has to be at least 94% efficiant at 50% load so the loss is more like 7-8% (given the are at about 65% load, loss might be less, even), not 20%.
 
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james.miller said:
20%?

Sure, if you're using an 80 plus bronze rated psu. They used a platinum psu in that review which has to be at least 94% efficiant at 50% load so the loss is more like 7-8% (given the are at about 65% load, loss might be less, even), not 20%.
Click to expand...

Either way, with 2 classy's at 1532, they were getting 826, even at 8% lossess that is still 760w on the PSU side, an 850W PSU should be able to draw at least 935W from the wall, and even then my [email protected] and SLI@1480 system draws less than 800W on full load, and mines not even platinum

If he wants to he could upgrade his PSU, but strictly speaking he doesn't need to

If Someone needs to ask about the cost difference between an 850 and 1000w psu then I would advise them to not bother getting 980ti SLI and instead wait for Pascal
 
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MrCSW said:
Hi.

Im waiting on my arrival of an EVGA 980ti Classified.
Looking at the specs online its max power draw is 300W.
Which seems quite high to me.

Im also due to upgrade my PSU (corsair hx850-older model)
And was leaning toward an EVGA p2 850w.

If i was eventually to upgrade to SLI 980ti classifieds, which should draw around 600w.
would this be borderline for an 850w psu? should i get the 1000w straight off the bat?.

Regrads
Callum
Click to expand...

Hi Callum

For issues like this in the future you can use the EVGA Power meter as well, this has been proven to be quite accurate in the advise it gives you on your system set up:

http://eu.evga.com/power-meter/

Thanks
Ben
 
Great tool, Thanks Ben.
It tells me i need either 1000w g1, 1000w g2 or 1000w p2.

Would be nice if it gave you a number for the power draw though.

So as long as i don't upgrade my system further i should be safe ;)
 
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