P67 RAM Issue

[ckellog]

Asrock P67 Extreme4 Gen3 MO
Intel i7 2600
CORSAIR CMZ16GX3M4A1600C9 - DDR3 1600 16GB kit (4x4G)
NVIDIA GeForce GT 520 2GB
Windows 7 Professional SP1

System runs stablely when 2 of the 4 DIMM slots are filled. Passes memtest and Windows Memory Diagnostic. When 4 modules installed into all 4 DIMM slots, memtest/Windows Memory Diagnostic fails and constant crashes/BSOD in Windows 7 Professional. Have tested each Memory module individually (and DIMM slots individually) and find no faults only when running with all 4 installed. Have updated drivers for appropriate elements. SDRAMs are all same and purchased as 16G kit. DRAM settings in BIOS are set to default timings/voltage. Running at 1033 will get me to windows but with indicated errors above; running at 1600 will not boot to windows at all. Would like to make use of all 4 DIMM slots. Thanks for any advice.

[wazza300]

Re: P67 RAM Issue

try with 1.08 qpi/vtt or imc voltage and set dram or dram bus voltage to whats printed on your ram,either 1.5v or 1.65v

[ckellog]

Re: P67 RAM Issue

try with 1.08 qpi/vtt or imc voltage and set dram or dram bus voltage to whats printed on your ram,either 1.5v or 1.65v

Modified VTT voltage and verified Ram voltage is as spec but still doesn't pass test.

[wazza300]

Re: P67 RAM Issue

Can test with more qpi/vtt,but no more than 1.2v,test between 1.08-1.2v add two clicks more at a time and test for errors

[onemoar]

Re: P67 RAM Issue

faulty imc maby ? you should't need more voltage to run at sub 1800 speeds

[ckellog]

Re: P67 RAM Issue

Can test with more qpi/vtt,but no more than 1.2v,test between 1.08-1.2v add two clicks more at a time and test for errors

Thanks. Tested from 1.08 to 1.2 with errors all along the way. This is a brand new build with a new processor, mobo & ram. I'm assuming it's something with the memory controller on the i7 but I haven't the slightest clue how to test.