i have just updated the newest bios 3402 for p8z68 v pro, but the problem comes up with the ram that i used to getting it run on 1600mhz, but now it just reaches 1333 mhz though i have set up all things in the bios needed. No matter what divider i set up (ex.2113), it still shows only 1333mhz of ram.
thanks for the help.
cpu: i7 2600k
ram: CMT4GX3M2A1600C7 (xmp yes), latency 77720, 1.65v. DDR3 1600 8GB
mobo: p6z68 v pro, chipset z68
original bios: 0402
problem: no ram speed mentioned in the bios (n/a), only the capacity stated 8gb.
the bios didn't work after updated.
1.65v can actually damage the IMC. Intel will not honor the CPU warranty if you use it. You are overclocking the integrated memory controller by using it. Also the ix 2xxx series can have problems with anything lower than cas 8. Only really good chips will run cas 7 with no problems especially 7-7-7-20. That is probably very old DDR3 to have those specs.
Drop the voltage to 1.55v and try DDR3 1600 cas 9-9-9-24 2T. You will see no difference in performance at all.