Quote Originally Posted by i_max2k2 View Post
just got the maximus iv extreme-z, and I was wondering if there was anyway to run 2 video cards on x16/x16?, it seems for 3 cards I can do x16/x16/x8 but for 2 cards the manual says x8/x8 which I found kind of weird.
Put them in slots 2 & 4 to run both at 16x, but if you have time, test them in slots 1 & 3 at 8x both. You should get slightly better results.

If you want to run 3 graphic cards at 16x, you should use slots 1, 2 & 4.

Quote Originally Posted by M_T_M View Post
What voltage should be change for overclocking i7 2600k for 5.0ghz+. I have Maximus IV Extreme-Z68? Where in the BIOS, the QPI Voltage
Thanks
Except obvious (vCore) you should try playing with VccSA & VccIO, which are something like QPI/VTT. Many say VccIO is the key, but I would not forget about VccSA. Don't forget DIGI+ VRM section.