I have the FX 8320 and have it OC'd to 4.0ghz without touching the voltage. Of course, it is possible that the 8320 could reach 4.5, but it is more likely that the 8350 will. It all depends on the luck of the draw with chips. The reason I went with the 8320 over the 8350 is that it was $50 cheaper for the exact same chip with just lower clocks, which I rectified by merely bumping up the multiplier.
The CPU should be able to handle those settings as the FX CPU's do really well in BF4 multi, but if you want guarantee the absolute best you would need to upgrade to an i7.