Hi, looking at the ASUS M4A78 Plus AM3/AM2+/AM2 AMD 770 ATX AMD Motherboard, I noticed the when in Crossfire the 2 slots being used run at PCIE 2.0 X4. Normally these run at least at 8x, and on better boards at the standard 16x. Most of the time 16x is overkill correct? 8x is probably more than adequate in most scenarios, but 4x seems a little sketchy. Anyone have experience or data that would say crossfire @ 4X is not enough bandwidth for video cards? or what card model would the cutoff occur at? Thanks!