4 x F3-12800CL7D-4GBRM on MSI P55-GD65

[stefan84]

Hello G.Skill-Team,

i am using two of the modules in my computer without any problems for over one year now. A couple of weeks ago I bought two of them again to have 8Gb in my computer but my computer always freezes in windows 7 x64. I tried Memtest86+ (V 4.20) and a second after it starts it finds dozens of errors.

The retailer changed the two new modules, because I thought they were broken. But even with the new ones I still get the same freezes. I also sent the mainboard back to MSI, thinking the mainboard is broken. They gave me a brand new one and I still won't get all four modules to work.

I also tried different timings in the bios, but I am not sure how to configurate them properly. Here are my settings:

Ch1 and Ch2
1T/2T Memory Timing 2
CAS (CL) 9
tRCD 9
tRP 9
tRAS 24
tRFC 79
tWR 10
tWTR 5
tRRD 4
tRTD 5
tFAW 20
B2B-Cas Delay 0

What do you think of the settings?

Thank you for your help!
stefan

[GSKILL TECH]

They should be this:

Ch1 and Ch2
1T/2T Memory Timing 2
CAS (CL) 7
tRCD 8
tRP 7
tRAS 24
tRFC 88
tWR 12
tWTR 5
tRRD 4
tRTD 5
tFAW 20
B2B-Cas Delay 0

If still unstable, raise IMC Voltage to see if that can stabilize full slots.

Thank you
GSKILL TECH

[stefan84]

Thank your for your fast respond,

unfortunately it is still not working. I tried it in 1333mhz mode and in 1666mhz mode and I still get freezes in windows and dozens of errors in memtest86+.

I am not sure about what you mean by raising the IMC Voltage. The Bios has no option with this name. But there is an option called "DRAM Voltage" and I put it manually on 1.601V, because the auto-mode chose 1.5...do you think I should raise it even higher? How much would you raise it?

There are also other voltages that can be changed.
DDR_VREF_CA_A (V) is automatically set on 0.850V
DDR_VREF_CA_B (V) is automatically set on 0.850V
DDR_VREF_DA_A (V) is automatically set on 0.850V
DDR_VREF_DA_B (V) is automatically set on 0.850V


I still found some "Advance Timing"-options that are all set automatically by the bios
tdrRDTRd 6
tddRdTRd 7
tsrRdTWr 11
tdrRdtWr 11
tddRdtWr 11
tsrWrTRd 15
tdrWrTRd 4
tddWrTRd 4
tdrWrTWr 7
tddWrTWr 7
tsrRdTRd 4
tsrWrTWr 4
These values can be changed for ch1 and ch2.

Thank you for your patience!
stefan

[GSKILL TECH]

IMC Voltage is CPU VTT Voltage in your BIOS. Raise that a couple notches to see if that works better.

Thank you
GSKILL TECH