Overclocking issue with a Z68A-G43 MB and 4*2 GB DDR3 Gskill memory kits

Question

Hi,
On my old MB, I overclocked my I5 2500k CPU to 4.2 Ghz , It was running with 4*2GB DDR3 modules and everything was stable since several months.
I use the same components on my new Z68A-G43 MB but I don't manage to start my PC in the same conditions.
The PC runs well in normal mode (not OC ) with the 4x2GB DDR3 modules
The PC runs well when overclocked to 4.2 Ghz (and it is very stable) with 2*2 GB GSkill DDR3 (1600 MHz CAS 7, reference - F3-12800CL7 2GBECO) modules placed in DIMM 1 & 3
But, when overclocked, the PC refuses to boot with 4*2GB DDR3 modules, after adding 2x2 GB GSkill DDR3 (1600 MHz CAS 8 , F3- reference - 12800CL8 2GBRM ) modules placed in DIMM 2 & 4
Same problem with 2x2 GB KINGSTON DDR3 (1600 MHz CAS 9, reference 99005403 - 125.A01LF ) modules placed in DIMM 2 & 4
I tried the most of the recommended settings in the overclocking forum: OC genie enabled or not , XMP enabled or not , timings manually set according to information given by CPUZ , decreasing the frequency of the DDR3 to 1333 Mhz...
In summary, my PC refuses to boot due to a memory issue (3 beeps at launch) when I put 4*2GB of DDR3 with a 4.2 Ghz OC (whereas it was running fine for months on my old motherboard P67A- GD65 ).
The PC runs fine with 4*2GB of DDR3 without OC or with only 2*2GB of DDR3 with a 4.2 Ghz OC.
Do you have any idea how to solve this problem ?
thank you for your advice

Answer 1

Yes. Get a factory matched and tested together RAM kit. Corsair work well on this series mainboard. That or try to increase the DRAM V. to 1.65v's, loosen the timings for all sticks to 9 9 9 24, CR 2. Good luck!