Ok so I have a client wanting to buy one of my rigs and then I'll keep the other one. However, I'm not sure which board I should sell and which to keep since they're both badass boards. Mind you both of these boards are basically NIB. Here's my choices: AsRock z68 Extreme 4 Gen 3 and the AsRock z77 Extreme 6. When looking at the boards, there doesn't seem to be a whole helluva lot of difference between the two. Now if I understand it correctly, the "Gen 3" z68 boards added native support for PCIe 3.0, USB 3.0 and SATA 6GB/s. However, one thing to keep in mind is that I have two unlocked 6950's and for some reason the unlocked BIOS doesn't work on the z77 chipset. This is a known issue that doesn't seem to affect the z68 chipset.