Ok I understand that z68 = Sandy Bridge motherboard. z77 = Ivy Bridge motherboard. now h77 usually has only 2 dimms and 1 PCI-E 16x. Also they usually have no 5.1/7.1 audio and less USB 3.0 ports and no esata ports. Now is that only the difference? Someone told me that the motherboards have less features like Intel Clear HD video and Intel Smart Cache. But I thought those had to do with the CPU? Some CPUs have those features locked? thank you.