That 1050W PSU is 500W too large for a single 7950, and 4-500 watts too large for dual-7950s. Get a 650W Seasonic Platinum, or 750W if youreally feel the need to be overkill, instead.
The Z77 Sabertooth is a sexy board, but very overpriced. At that price, you're better off getting an Intel 3820 and an X79 board. I'd get the Gigabyte UP4 X79, paired with the 3820. X79 is much more powerful than Z77.
The timings on that memory are pretty terrible. I would get a 2x8GB kit of G.SKILL Sniper 1866mHz CL9 memory. Same price, better timings; essentially, it's faster in every way.
Other than that, it looks pretty good.
750 watts is enough to power dual 7950s? Sorry, I'm still a little bit new to the custom PC scene.
Also, why is X79 more powerful? I'm not doubting that at all, but I just do not know the reason. Is it because the buses on the mobo are faster?
I do really like that RAM. Good choice
Same with what Bren said. 1050 is just over kill.
On the website it states that for the GPU you are getting the, Sappire Flex 7950 is that the
- System Requirements: Minimum of a 500 Watt power supply.
- I would suggest with what Bren also said, that a 650W will be fine for a single card, plus would give you abit of expandability. If you really wanto to make sure you have enough and a lot more for expandability a 750W would do.
If you can spend about $50 more, I would make these changes:
SeaSonic X750 Gold:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151087&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
Intel Core i5 3570K:
http://www.newegg.com/Product/Product.aspx?Item=N82E16819116504
Samsung 840 Series 120GB SSD (keep the hard drive too):
http://www.amazon.com/dp/B009NHAF06/?tag=pcpapi-20
XFX Radeon HD 7970:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150586&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
This build is much more suited for gaming, and you should still be able to run virtual machines without difficulty. Not to mention that the SSD will give you a very significant speed boost. The PSU would also allow you to add another 7970 later on if you wanted.