r9 295x2 questions

Solution
The i7 4790k will push that card in any game. The i5 4690k will also, both turbo to ~4Ghz. The 4790k boosts to an insane 4.4Ghz. Any modern CPU (any high end i5 or i7 in the 3 or 4 series) will not bottleneck badly, but games like BF4 and Planetside 2 hammer the CPU so you might want to overclock.

TL;DR The 4690k or 4790k will do the job well.
That PSU should power it, but I am not 100% sure. The CPU would bottleneck pretty badly, you would need to overclock it. A 4.0Ghz Haswell CPU is about the same as a 4.8Ghz Nehalem CPU if I am correct. I would upgrade the CPU if you can.
 
The i7 4790k will push that card in any game. The i5 4690k will also, both turbo to ~4Ghz. The 4790k boosts to an insane 4.4Ghz. Any modern CPU (any high end i5 or i7 in the 3 or 4 series) will not bottleneck badly, but games like BF4 and Planetside 2 hammer the CPU so you might want to overclock.

TL;DR The 4690k or 4790k will do the job well.
 
Solution