7970 Crossfire 750W ?

[JacksonM]

Just looking for recommendation or opinions,

I have a Corsair CX750M and I wish to Crossfire 2 x Asus 7970 Matrix Platinum's and I am wondering will this power supply pull off the job. Seen a video with guy using Corsair GS800 power supply to power these cards but is that extra 50 watts needed ? I have nothing overclocked, Here is that video http://www.youtube.com/watch?v=LIeRXohGn10

Further Specs:
Asus Rampage IV Extreme
I7 4820k
H100 Water Cooler
1x Asus 7970 Matrix Platinum
8GB GSKILL 1600mhz
Creative Fatal1ty Champion series Sound Card
1x 120gb SSD
1x 1000GB 7200rpm HDD

 

[i7Baby]

Its recommended to use 800W for xfire 7970's. And a good quality power supply per http://www.tomshardware.com/answers/id-1804779/power-supply-unit-tier-list.html

eg Seasonic M12II 850W, Antec HCG 850M, Corsair AX860

 

[JacksonM]

Its recommended to use 800W for xfire 7970's. And a good quality power supply per http://www.tomshardware.com/answers/id-1804779/power-supply-unit-tier-list.html

eg Seasonic M12II 850W, Antec HCG 850M, Corsair AX860

So I guess you mean its time for me to upgrade PSU if I wanted to Crossfire then yes ? What if i got a different type of 7970 not necessarily the matrix platinum , but What about the new Asus R9 280 Strix for example ?

 

[i7Baby]

You'd still need 800W for 280x in xfire. The brand of 7970 doesn't matter. And the CX is not a high quality power supply anyway.

 

[JacksonM]

You'd still need 800W for 280x in xfire. The brand of 7970 doesn't matter. And the CX is not a high quality power supply anyway.

mhmm well I guess I will have to look into one of those PSU you listed above ,thank you for telling me, I was extremely curious how that guy was pulling them off a 800 watt , Thanks anyways admire the help

 

[ish416]

The most I have ever seen my system pull was 736W according to my kill-a-watt during absolute worst case scenario testing. It has an FX8350 @ 5.2Ghz liquid cooled, 2x R9 290s overclocked and liquid cooled (running 3x1080p @ 144hz), 1 SSD, 3 HDD, 1 DVD, Soundblaster ZX, three small water pumps, a fan controller and 9 Noctua case/radiator fans.

I would think that with nothing being overclocked, your system should be able to run with a good bit of headroom with just a 750W PSU.

 

[i7Baby]

A good one though.