Corsair TX650w and 6950 Crossfire

[patapat]

My current setup:
Case Antec Three Hundred Illusion Black Steel
Mobo Gigabyte Z68XP-UD3 LGA 1155 Intel Z68
CPU Intel Core i5-2500K Processor 3.3GHz
RAM G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333
GPU AMD Radeon 6970 2GB reference card
PSU CORSAIR Enthusiast Series TX650 V2 650W ATX12V 80 PLUS BRONZE
SSD Crucial M4 64gb
HDD Seagate Barracuda 7200.12 1 TB 7200RPM

I'm thinking about switching to a 6950 crossfire and trying to unlock to 6970. I'm wondering if my 650w psu will be sufficient. I've read some forum posts and it seems like the consensus is that a quality 650w psu can support a 6950 CF, but without much headroom to OC the CPU and GPU.

I used this site: http://extreme.outervision.com/PSUEngine to calculate the wattage got about 510w.

I'd appreciate it if anyone can comment on this specific setup and let me know if if the 650w will cut it. Ideally, I'd get a 750w psu, but I just want to know how the 650w will handle it. Thanks!

 

[rolli59]

It does only have two PCIe connectors but it will power them, here is a few cards compared total system power http://www.anandtech.com/show/4239/nvidias-geforce-gtx-590-duking-it-out-for-the-single-card-king/16

 

[patapat]

Right, I'll grab adapters for that. I'm fairly confident it'll run fine with stock clocks. How do you think it'll fair with CPU and GPU OC? Not worth the risk?

 

[rolli59]

If you overclock on std voltage you should be fine, with that GPU power you hardly have to overclock the cards.

 

[patapat]

Best answer selected by patapat.

 

[vexun11]

I am running 2 5830's with that same TX650W Corsair psu and everything runs fine except when I overclock my CPU I get bluescreen upon boot if I try to go past a small mild overclock, and even with the mild overclock my 3dmark 2011 scores are lower then at stock clocks, back when I only had 1 5830 I could overclock my cpu up to 4.2ghz, now I have to leave it at stock clocks, do the 5830's use more power then 6950's?

 

[patapat]

Looks like the 5830s are quite power hungry.

http://www.anandtech.com/show/2947/12

The 6950 comes in lower.

http://www.anandtech.com/show/4137/amds-gtx-560-ti-counteroffensive-radeon-hd-6950-1gb-xfxs-radeon-hd-6870-black-edition/6

I ended up getting a 750w psu so I have no problems.