Will a 750w psu be enough for the second GPU in crossfire setup?

[mateenah95]

Current rig:

CPU: FX 8350 Overclocked to 4.4Ghz
CPU Cooler: Cooler Master Hyper 212 Evo
MB: Gigabyte 990FX UD3
RAM: Kingston Hyper Fury 2x4GB 1600Mhz
GPU1: Gigabyte R9 280 Windforce OC 3GB
Case Fans: 2x 200mm 1x 2x120mm
Storage: 1x 128GB SSD 2x 7200RPM 3.5" 1TB Derives

I am currently using the above setup on a 750W EVGA 750W 80+ Bronze PSU. However I want to add a second GPU for crossfire. Most likely it will either be another R9 280 or R9 280x. I want to know if the 750W PSU will be able to handle the second GPU under heavy load or not. Please advice. Thanks.

 

[Dark Lord of Tech]

850W will be needed.

 

[VincentP]

You won't possibly want to run this on a 750W supply.
FX-8350 TDP = 125W
R9 280 TDP = 250W
Allow 40W for other components
Maximum sustained draw 125W + 250W + 250W + 40W = 665W
You want a supply rated at least 70A on the +12V rail to stay under 80% of rated power.
This also isn't allowing for any additional power your CPU may be using due to over clocking.

The EVGA Supernova G2 850 is a great quality supply rated at 70.8A on the +12V rail.
This would probably be fine, but in my opinion is cutting it a little close.
I would choose the EVGA Supernova G2 1000 instead.