A i5 3570k will bottleneck depending on games those two 7950s only if you game al low resolution.
@ 1080p or higher resolution or ultra maximum graphics settings no way a 3570k can bottleneck your 7950s
Even if some days it does you can always overclock the CPU make it run faster.
No worries, Enjoy
You need to change the psu to something better like a TX750 CX750 or XFX750 watt.
It can power but not reliable for long run, Coolermaster psus are not the best to be honest