AMD Fx. 6350 bottleneck GTX 760 SLI

If you have a good cooler, you can OC the 6350 to 4.5GHz or so and that should minimize any potential bottlenecks.

Some 6350s come with an 8350 style cooler (* copper base and heatpipes, HIGH rpm FAN). Much better than the 6300 series coolers (all alluminum, MEDIUM rpm FAN). I still recommend a good aftermarket cooler though.

Provided your RAM and Board are good (*** You NEED a 990FX board for crossfire or SLI as it is the chipset that can support 2 PCIe GPUs and have BOTH at 16x ***) you should have very good performance.

For reference: The 970 chipset will usually do x16 and x4 with dual GPUs. So your bottleneck on this board will be with the GPU on the 2nd PCIe slot not being fully used. Better to go with a single high end GPU on the 970 boards.

For reference: There are several recent YouTube videos showing the FX 6300 + R9 270 (single GPU) in BF4 on high with good framerates. Your 6350 should be fine as long as you have a 990FX board.