Will a Asus M5A78L-M/USB3 motherboard bottleneck my rig?

Aware of that, however yes we'll be overclocking his system. I chose an aftermarket cooler for that.

Can you recommend some 990 series chipsets for around the same price? Another 20$ Shouldn't be a problem though.

Thanks for response!

ÉDIT:

Maybe an ASRock 990FX Extreme3?