hd radeon 78x0 - PSU

[thiagofmelo10]

I own a Corsair CX-500w PSU, I know for a single 7850 is Enough, but if I go Crossfire 7850 can my PSU maintain? on AMD site says reccomended 600w for Crossfire.
Some Power Supply Calculator says its enough, others says its not.
I have connected a 2 SATA (1 hdd and 1 dvd driver) and 3 fans in my case total (including cpu)

Asrock z77 MB, 4x4ddr3 RAM and i5-3570k processor

 

[lehtv]

If you don't overclock anything it's OK. The +12V is rated for 384W, your system would use around 300W with CPU and both GPUs fully stressed at stock clocks and volts.

I would not bother though. For 1080p, a single overclocked 7850 is good enough, and I'd rather OC the i5-3570K properly as well to minimize bottlenecking in more cpu-heavy scenarios.

 

[thiagofmelo10]

I plan to do around 10% OC at most, what about 7870's?
in Techpowerup it was 144w MAX usage on 7870

 

[jacktesterson]

I ran 2 x 7850's overclocked with a 2500k at 4.5 GHz off a OCZ ZT 550w PSU, no issues at all.

The ZT 550 can do all 550w (45a) on the 12v though.

Personally I wouldn't do it on a CX 500. Not comfortable enough for me.