Mixing Ram

[Sinn]

Mobo MSI NF750-G55
AMD Phenom II x4 955 BE
G.Skill DDR3 SDRAM DDR3 1600

Currently in my system I have 4gb G.Skill DDR3 SDRAM DDR3 1600 (PC3 12800) with timing at 99924 defaulted to 1333(model #F3-12800CL9D-4GBNQ) in a MSI NF750-G55 Mobo. I purchased the ram before I realized the board recommended DDR3 1333. The board is running fine defaulted to the 1333.

After I realized the recommendation of 1333, i purchased the correct 4gb G.Skill Ripjaw DDR3 SDRAM DDR3 1333 (PC3 10666) (model #F3-10666CL9D-4GBRL) with the timing at 99924.

Now, my questions is- can I mix & match these two with same voltage and timings and the system run stable?

Thx in advance!

[Tradesman]

Should be okay, may have to raise the tRFC to 195 if the BIOS doesn't pick it up and do it for you.

[Sinn]

I added the Ripjaw DDR3 SDRAM DDR3 1333 (PC3 10666) and booted up without changing anything and had no problems. It ran fine for a couple days so I figured it auto detected, like you said above. Then my system seemed to be unstable and then I started getting blue screen. I check the tRFC and I have three- tRFC1, tRFC2, tFRC3, with the options 90ns, 110ns, 160ns, 300ns, 350ns.

I'm pretty new at this so please forgive me. What should I do?

[GSKILL TECH]

Set those to 160ns. Increase the NB Voltage to 1.30V. Let us know how that goes.

Thank you
GSKILL SUPPORT

[Sinn]

I set them to 160ns, but the NB is set to auto and won't allow me to change it. With the setting at 160ns, the system seems to be completely unstable and won't allow me to bootup. I take the 1333 (PC3 10666) out and everything runs great. What's next?

[GSKILL TECH]

NB Voltage is not locked. Try the + and - buttons.

Thank you
GSKILL SUPPORT