Ce3in :
And btw,will an XFX Black edition 1050w PSU handle R9 295x2?
no, you want 1400W+, two R9 295X2's have a TDP of 500W each, that is already 1000W, adding the CPU it is already over that, and that isn't even adding the rest.
You want a Corsair AX1500i, 1500W, 80+ Titanium certified. That is what you want for sure.