You should be good. I mean, something will always "bottleneck" something. That word is just stupid, imho... I mean the only relevant use for it is for very obvious issues with component balence... for instance if someone was running a 4870x2 on an old Athlon X2 CPU... now that would be a bottleneck. Now sure, one part of your system (either the CPU or GPUs, but likely the CPU) is probably "slower" than the other, but not to the extent where you'd really call it a legitimate bottleneck. That word is just thrown around all the time these days, and it's stupid.