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PSU for 2 x GTX 295 (Quad SLI)

jamrowls said:
i7 @ 4ghz @ 1.4v
BFG GTX 280 OC 2x Sli @ Stock OC

Full load = 861w

So I would say no 850w will not be enough!
Click to expand...

Got some brown-talk going on here.

You're aware that an 850w suplies 850w for the components, which, if it were an 80% efficient PSU would be 80% of the power it's drawing from the wall?

Putting it simply, for an 850w PSU to supply 850w to the components, it would be drawing 1060 from the wall.

So, if it's drawing say 850 from the wall, it's well within its limits anyway as it's only supplying 690 to the components.

I don't get how you've worked out 2 GTX280s and an I7 setup will draw over 850w, that's just complete idocy if you geniunely think that.

GTX295 SLI in an I7 setup doesn't even use 800W so your suposed fact is not actually fact at all.

Care to demonstrait where you came up with those figures?

Mike2801

Your current 850w PSU will be absolutely fine, it's well capable of powering what you want.

Although I think you're crazy for wanting GTX295 SLI, I'd personally get a 4870X2 and or wait for the new cards coming in a few months, save you a lot of money for no noticable difference in performance.

Here's some tests by bit-tech that measure the power draw at the wall for an i7 setup with various graphics setups.

http://www.bit-tech.net/hardware/graphics/2009/01/08/nvidia-geforce-gtx-295-quad-sli-review/16

So remember, assuming your PSU is AT LEAST 80% efficient, which all new ones have to be, you'll be safe to assume that your PSU will suck 1060+w from the wall at peak.

So you'd have over 300w overhead with your current PC for an SLI GTX295 set up, but I wouldn't recommend going for that anyway. :p
 
thevet said:
get a 1300w like mine then you wont have to worry about psu issues for a long time...FUTURE PROOF!!
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Something that seems to be future-proof isn't always a sure thing.

My Enermax Galaxy 1000w seemed totally future proof for anything back in 2006, and while it can cope with practically anything available, I think that 2x 4870X2s or 2x GTX 295s might require more amps than it can provide.
Then again, those are extreme examples.
 
Happy said:
Why would he get a Be Quiet 850W when he has a Corsair 850W. Do you not read threads before posting.

I would be a bit wary, but I imagine it would power it.
Click to expand...

Obviously not this time.

Is this better:
Get a Be quiet PSU (1000W+) if you are wanting to upgrade. However, i would imagine your 850W should be fine.
 
Your current 850w PSU will be absolutely fine, it's well capable of powering what you want.

Although I think you're crazy for wanting GTX295 SLI, I'd personally get a 4870X2 and or wait for the new cards coming in a few months, save you a lot of money for no noticable difference in performance.

Here's some tests by bit-tech that measure the power draw at the wall for an i7 setup with various graphics setups.

http://www.bit-tech.net/hardware/graphics/2009/01/08/nvidia-geforce-gtx-295-quad-sli-review/16

So remember, assuming your PSU is AT LEAST 80% efficient, which all new ones have to be, you'll be safe to assume that your PSU will suck 1060+w from the wall at peak.

So you'd have over 300w overhead with your current PC for an SLI GTX295 set up, but I wouldn't recommend going for that anyway. :p
Click to expand...


Thanks for the post mate. It's nice to get a reply from someone who's genuinly in the know, as there are a lot of contrasting opinions on this thread..

Regarding the GTX 295 SLI advice: I only plan on purchasing and installing a single GTX 295 card with my new build. I wanted to know if the PSU would be suitable for SLI so I could add a second card in the future, if it proved worthwhile.

I totally agree that nearly all today's games bar maybe crysis, will not see any true benefit from running SLI on the GTX 295 (and that's only because I plan to run it on enthusiast settings and at 1920 x 1200 resolution on my DELL 2407 24" Monitor).

I'm quite happy to spend money on a top end rig, but with the price of the card atm combined with my current needs, buying two of them at £400+ is a monumental waste of money and electricity lol!
 
mike2801.lee said:
Thanks for the post mate. It's nice to get a reply from someone who's genuinly in the know, as there are a lot of contrasting opinions on this thread..

Regarding the GTX 295 SLI advice: I only plan on purchasing and installing a single GTX 295 card with my new build. I wanted to know if the PSU would be suitable for SLI so I could add a second card in the future, if it proved worthwhile.

I totally agree that nearly all today's games bar maybe crysis, will not see any true benefit from running SLI on the GTX 295 (and that's only because I plan to run it on enthusiast settings and at 1920 x 1200 resolution on my DELL 2407 24" Monitor).

I'm quite happy to spend money on a top end rig, but with the price of the card atm combined with my current needs, buying two of them at £400+ is a monumental waste of money and electricity lol!
Click to expand...

No problems, happy I could be of some help. :)

The contrasting opinions are simply from people who don't know what they're on about. :p

I've found that people go way overboard when specifying PSUs because of something 'their mate told 'em' :D
 
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