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700watt enough power for Xfire 6950?

post #1 of 13
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Hey guys so I just ordered 3 acer 21.5 inch monitors for EyeFinity and obviously don't have the power to run the 3 of them on full hd in eyefinity with max settings on most games with playable frame rates (I only like 30+ frames)

So I'm now in the market for a second 6950 but I have concerns about my Powersupply, I will obviously flash my 6970 back to it's original 6950 status but will a Thermaltake Litepower 700watt powersupply cut it? I have checked many different PSU caculators. newegg told me to get a 821watts psu and thermaltakes power caculator suggested I order have 644watts... (check attachments) that's a big fluctuation, so I'm now wanting opinions..
anyone who can back up there answer = +rep

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post #2 of 13
Hmm, I would think that that would be enough.

I run my entire system off a 650w unit. Never had an issue. Everything in the Sig (125w CPU), plus 7 LED fans. I'm sure I still have some headroom left.

I know there not the same cards, but shouldn't be too far off in power draw.

Like others point out, main thing is the quality of your PSU. Mine is pretty decent, and they aren't lying about the max wattage.

Here are the specs:


ModelW0356 / W0355
TypeIntel ATX 12V 2.3 & EPS 12V 2.91
Output Capacity600W / 500W
Max. Output Capacity700W / 600W
ColorSilver
Dimension ( W / H / D )150mm x 84mm x 140mm
PFC (Power Factor Correction)Active PFC
Power Good Signal100-500 msec
Hold Up Time16msec (minimum)@70% load,230Vac/50Hz
Input Current550W: 6A@115Vac, 3A@230Vac
Input Frequency Range47Hz ~ 63 Hz
Input Voltage700W: 10A@115Vac, 5A@230Vac
600W: 8A@115Vac, 5A@230Vac
Operation Temperature10 ℃ to + 25 ℃
Operating Humidity20% to 80%,non-condensing
Storage Temperature-40 ℃ to +70 ℃
Storage Humidity5% to 95%, non-condensing
Cooling System2000±10%R.P.M.
Efficiency70% (min.) at normal AC input voltage and frequency
MTBF100,000 hrs minimum
Safety ApprovalUL, TUV, CE, FCC,BSMI,GOST
PCI-E Connector6Pin x 1, 8Pin x 1
Warranty
2 year
Edited by Biscuits_N_Gravy - 2/11/11 at 6:57pm
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post #3 of 13
6950 in crossfire has a 479 draw on the power supply. You would be fine.
6970 in crossfire has a 596 draw on the power supply. You would be close to max if not at max. In that case I would suggest upping to a 750-800w PSU. (Assuming that the unlocked runs close to the same power consumption)
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post #4 of 13
Yes a quality 700W PSU should handle 2x6950s. Is the TT lp 700W a quality PSU? I don't think so.

So get a better PSU. Seems like the Litepower units are sold across only Aus-NZ.

Can you tell us how much amps the 12v rail supplies.

EDIT: Looks like it has dual 12v rails supplying 30A and 22A. It should do the job, but you'll really have no headroom for OC'ing and further upgrades.
Edited by adizz - 2/11/11 at 6:59pm
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post #5 of 13
12v1 30a
12v2 22a

Good for ~620w


You will probably want to upgrade to a better 700w or even a 750w PSU.
Edited by M0E - 2/11/11 at 7:01pm
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post #6 of 13
Thread Starter 
Quote:
Originally Posted by adizz View Post
Yes a quality 700W PSU should handle 2x6950s. Is the TT lp 700W a quality PSU? No.

So get a better PSU. Seems like the Litepower units are sold across only Aus-NZ.

Can you tell us how much amps the 12v rail supplies.

EDIT: Looks like it has dual 12v rails supplying 30A and 22A. It should do the job, but I'm thinking its just an lower watt unit labelled at 700W.
Is there some kind of device I could buy to check that? 10 bucks over 100 bucks any day.
Well if the capacitors age quickly... it has a 2 year warranty
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post #7 of 13
Haven't heard Litepower for a while. I think it is a FSP unit. It probably pulls 48a, about 570w on 12v. 6950 is a 200w GPU, with CF scale, 2x takes up to 370w. X6 at 3.4G may take 160w depending on the voltage. It may make the cut but it is at edge, probably not when 6950 CF OC.
post #8 of 13
Quote:
Originally Posted by gamingowiz View Post
Is there some kind of device I could buy to check that? 10 bucks over 100 bucks any day.
Well if the capacitors age quickly... it has a 2 year warranty
I found that out for you, the amperage are printed on your PSU. Like I said earlier it will make the cut but it'll not allow any room for OC'ing and further upgrades.
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post #9 of 13
gaming you will be absolutely fine. Now in furmark you might get pretty close to the limit.
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post #10 of 13
Quote:
Originally Posted by tconroy135 View Post
gaming you will be absolutely fine. Now in furmark you might get pretty close to the limit.
Furmark will most likely make it squeal.

OP, remember that a cheap PSU can ruin all the fun. No one wants to RMA all their gear due to a malfunctioning PSU.

I had an Apevia Ice Berg 680w when I first started here. Started to scare me, so I ditched it for something that was more efficient and was built better.
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