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Whats the recommended PSU watts for 2x 6990 xfire cards

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October 19, 2011 7:13:36 AM

Im about to get 3x 6990 cards at a super cheap price that i cannot refuse, its pretty much a bargain.
I have currently using antec 1250w psu quatto.

Will this be enuf to run 3x xfire?
a c 104 ) Power supply
October 19, 2011 7:32:57 AM

You can't run a 6990 in three way, only in 'normal' crossfire on a board that supports quad crossfiring,
buy three if its a deal, then sell one on or keep as a spare in case of disaster :p 
and no, that psu wont handle three in any case, 750w psu is recommended for one card alone
Moto
a b ) Power supply
October 19, 2011 7:55:07 AM

It would be cutting it close, very and unconfortably close.

I hope you have a great case. That Xfire will blaze like the sun!
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October 19, 2011 8:41:16 AM

yeah i have an hafx case. Damn here i thought 1250w psu would be enuf for 3x 6990.
But it seems moto said you cannot do 3way xfire???
im pretty much getting 1x 6990 for 200 bucks per card. such a bargin from a good friend :) 
October 19, 2011 9:21:00 AM

Yes you cant run 3x6990, as 4x GPU is the max that we can go, so you can only run 2x6990 (which is basically 2x 2x6970's)...

Wattage wise a 1250 should run them, although you will be cutting it fairly close (depending on the rest of your system)..

if you give more details as to what cpu, motherboard, drives etc then we can give a more precise answer if the 1250Watt PSU will suffice...

regards
a b ) Power supply
October 19, 2011 9:32:58 AM

Sorry I was looking at the Title of the post. (2X instead of 3x).

yes it wont work, and the 2x would be pushing it. As for your case.

You are still gonna have heating issues.
October 19, 2011 10:01:13 AM

i got amd 955 be (OC to 4ghz)
msi k9a2 cd mb
dd2 4gb ram
1250 antec quattro psu
hafx case
corsair h100
3x sata hdd + dvd drive

i might have to chg mb/cpu to avoid bottleneck, but thats no issue can be sorted out easily. AMD 955 is still a wonderfull CPU once overclocked in my opinion, and dd2 is appearently not much of a speed difference to ddr3 conversion.
a b ) Power supply
October 19, 2011 10:03:31 AM

I think you gonna be ok with the PSU. Are you gonna overclock or something?
October 19, 2011 10:31:36 AM

i will just oc my cpu. Theres no need to OC the 6990 thats just silly its fast enuf as it is lol
October 19, 2011 10:44:55 AM

Heh, do u really need 2? 1 of those is pretty awesome, u planning to run games in 2500x1600 maxed out?!? otherwise it's a total overkill, not to mention your CPU might bottleneck the card.
a b ) Power supply
October 19, 2011 11:46:34 AM

st4rkill3r said:
Heh, do u really need 2? 1 of those is pretty awesome, u planning to run games in 2500x1600 maxed out?!? otherwise it's a total overkill, not to mention your CPU might bottleneck the card.


Since he is getting it anyway, the possibity of a bottleneck doesn't matter as it will still run as much as teh CPU can handle no matter what he decides.

But keep in mind, most games are only limited by the GPU, so its not really relevant to say that CPU would bottleneck.
October 19, 2011 11:46:40 AM

in reality i would prob just get one, but since im getting them at such cheap price why not 2 and xfire :) 

October 19, 2011 11:47:56 AM

Okay I went onto one of those PSU calculator sites, I overclocked the cpu put 2 6990's in 5 drives a couple of fans a dvd and a few other goodies...

at full system load 1210 Watts which is really close to your 1250W ceiling...
That being said, I would say get another PSU that is 1400 Watts or something thereabout... Or just use one of the 6990's and ship the other 2 to my address (I'll test them for you :D )

regards
a b ) Power supply
October 19, 2011 12:13:07 PM

I will do one better than dork_police :

I will even pay for the shipping!!!
October 19, 2011 12:17:57 PM

well, can you blame me for trying :D ?

anyway hope that i pointed you in the right direction - or helped in any way.




P.S. I will always welcome a 6990 that is stranded on my doorstep :) 

enjoy mate
a b ) Power supply
October 19, 2011 1:12:04 PM

evilgummybear said:
Im about to get 3x 6990 cards at a super cheap price that i cannot refuse, its pretty much a bargain.
I have currently using antec 1250w psu quatto.

Will this be enuf to run 3x xfire?



You can accurately and objectively determine the PSU requirements in watts and 12v rail amps. for this or a future build from the link below. It's easy and accurate. Give it a try and then you'll be able to help yourself and other PC enthusiasts in the future.

http://www.tomshardware.com/forum/314712-28-please-read...

IT'S BETTER TO TEACH A PERSON HOW TO FISH THAN GIVE THEM A FISH FOR DINNER !
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