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Nvidia Nforce 4 based dual SLI system PSU great link

F

figfiddle

Banned
I have found the ultimate resource for those of us concerned about powering our soon-to-be Nvidia Nforce 4 based dual SLI systems. You will find this information very comforting and realize that we actually have more psu's to choose from than we actually thought we did.


Linky
 
Bookmarked. Thanks!

I didn't realize my 9800xt was such a power-hog (3w less then the x800xt, accordng to pg 4) 😛

and the Miscellaneous Item Power Charts shows the DVD-ROM/RW to be the 2nd biggest consumer - 2x/3x the HD's usage
:shocked:
 
Man the 6800gt is very efficient, huh?
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i am probably aiming for something like that in my next build . . . . 2 Sli'd 6800GTs and an AMD 64 3500+ WILL run on a 360w PS. 😉

of course there is little margin for o/cing, etc. but "even" my budget 480w Thermaltake's 18 amps on the 12v rail will handle this system (and a 'bit' more) 🙂
 
I already purchased the Modstream 520W and I was worried until I read this resource. I thought I made a mistake and would need at least a 600W psu to run one of these dual SLI systems.
 
Originally posted by: apoppin
up for the am crew!
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His power draw numbers for the 6800GT can't possibly be right. NVIDIA quotes them at around 100W max (110W for the 6800U), and he says they only take (3*12 + 5*4) = 56W from the PSU. Power draws scales pretty much linearly with clockspeed, so I can't imagine the GT would pull less than 80-90W at load.

THG power draw numbers

That's a 6800U, not a GT (so it might be a bit lower) -- but it's drawing 85W more (from the wall) at load than a system with a 9600XT. Even factoring their PSU's quoted 69% efficiency into account, that's a 60W difference -- and the 9600XT is probably already pulling 30-40W from the PSU.

Edit:

here's another article

This means the overall power consumption of the GeForce 6800 Ultra must be somewhere between 77.5 Watts, and 123.5 Watts.
Click to expand...

The 6800U pulled 78W just from the molex it was attached to (so that's not taking into account any power coming from the AGP slot itself, which could be up to 46W). Again, the GT might be 10-20% lower, but probably not much more than that.
 
Originally posted by: klah
Originally posted by: Matthias99
Originally posted by: apoppin
up for the am crew!
Click to expand...

His power draw numbers for the 6800GT can't possibly be right. ...
Click to expand...

http://www.xbitlabs.com/articl...ati-vs-nv-power_3.html
http://www.xbitlabs.com/images...wer/6800gt_table-b.gif

Don't forget that the Ultra uses a higher voltage as well.
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Didn't know that, and that does change things quite a bit. If the core voltage on the 6800U is 1.45V as compared to 1.35V on the 6800GT (numbers I saw at xbit), that would add another 15% (1.45^2 / 1.35^2) to the power draw at the same clocks. That might push it down to ~60-70W, and with likely a bit less leakage draw from lower temperatures, 56W is not totally unbelievable.

I stand corrected, but note that the reviewer still recommends a 400+W PSU (at least 20A on the +12V rail) for some headroom when running a 6800GT SLI system. Most ~350W PSUs would be pushed close to their limits powering a high-end CPU and two 6800GTs on their 12V rails (normally rated for 15-18A).
 
Would turning on the PVP with the soon to be released PureVideo enabled drivers make a difference?

I think I'll stick with NV's numbers since power measurement can be very tricky.
 
Originally posted by: figfiddle
What would you say as to the Modstream 520W with the 28A 12V rail being able to power a dual 6800 Ultra system?
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Gravy

 
Originally posted by: figfiddle
You are set for a long time with that ps. Good choice.
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I learned most of what I know from following your threads... I can't wait to get my greedy little hands on a motherboard.
 
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