Will a corsair 750TX handle 2 AMD 7950s?

Absolutely.  All that would really be needed to power a system that has two 7950s in it would be a quality 550 to 650W power supply.

Quote:

Originally Posted by Nvidia-Brownies 

Take a look at the TDP for one single 7950, and then double it for two. Then, take a look at the 12V Rail(s) Amperage. How to calculate wattage on a 12V rail:
12V * (X) Amout of Amps = How many watts the 12V rails carry. So, If I had a 40A Rail, I would do 12*40 = 480. I have 480W's on that rail.
That should help. You're welcome.

The 2nd card in either Crossfire or SLI usually pulls roughly half the amount of power that it would pull when maxed out by itself in a system.

I found a professional review that measured the total system power consumption at the wall outlet with two 7950s in Crossfire under full load, and their system pulled 450W at the wall outlet.  Now, that's mostly the video cards, so I'll add 200W in order to figure in the power draw of the rest of the system which brings the total to 650W.  However, the PSU is not 100% efficient, so I'll assume that it's 85% efficient which would result in a 550W power draw from the PSU at the extreme most.  That is, it's unrealistically high.

http://www.legitreviews.com/article/1853/10/

Quote:

Originally Posted by Nvidia-Brownies 


Well yes, but you should have head-room for capacitor aging, and future upgrades. Gotta think ahead nowadays, twocables!

I am already taking capacitor aging into consideration.

Regarding future upgrades, all I'm doing is telling him much headroom he has.  After all, he already owns the TX750.

So, you're not telling me anything that I don't already know, but I thank you for your concern.

Final edit:  Not only that, but capacitor aging is MUCH less of a concern with enthusiast-class PSUs like the TX750.  These kind of PSUs are MUCH tougher than you think and they last much longer than you think.  Besides, he's just asking a simple question, and so I'm providing a simple answer.

Quote:

Originally Posted by Negma 

Thanks for the response guys! I never really understood what power my PSU should have, and from the unanimous response that a 750Watt PSU can power two almost high end GPUs begs that question of why the heck would anyone buy 1000Watt or 1200Watt PSUs in the first place? Is it for people that wish to go quad SLI/Crossfire with a bajillion ton of other stuff in their rig?

I think that it's because they are making up for a lack of knowledge.  They'd rather spend money instead of time.  The time would be spent learning that they could just get a nice 550W or 650W power supply.