RAM Not Running Correctly

goobawhoba · Jul 11, 2015

I just bought new RAM and installed it in my computer, 8GB of DDR3 1866Mhz. I went into BIOS and it says that it is running at 1600Mhz? I know my board can support it because it says 1866(O.C.) http://www.msi.com/product/mb/760GM-P34-FX.html#hero-specification This is my board, MSI 760GMA-P34 (FX) and I have an AMD Phenom II X4 840 2.6Ghz processor. Any help would be greatly appreciated! Thanks!

Rogue Leader · Jul 11, 2015

Two questions, 1 is are you replacing old memory or adding to it? 2, did you look in the OC genie section you may need to enable it through the bios, this is assuming the 1866mhz memory is the only memory in there

goobawhoba · Jul 11, 2015

Rogue Leader :

Hi thanks for responding! I am replacing old RAM and it is one single card. And I where exactly is OC Genie?

Tradesman1 · Jul 11, 2015

While the mobo may support 1866, the determining factor is the MC (memory controller) of your CPU, with the X$ 840 it's base for DRAM is 1333 so will prob reuire a healy OC of the CPU as well as additional voltage to DRAM and MC, may also reuire loosening of the timings for the DRAM

goobawhoba · Jul 11, 2015

Tradesman1 :

Ok that makes more sense now. I did try to manually increase the RAM speeds in BIOS and I had 5 choices Auto, 1:2, 1:2.66, 1:3.33, 1:4, I chose 1:4 which put the RAM speed to 1600 Mhz, now I did not see an issue with this but it bricked my computer on restart so I am currently wiping the CMOS and I will leave it alone and not mess with it anymore for fears of damage. But did this happen because my processor could not handle/support this clock speed?

Rogue Leader · Jul 11, 2015

WHen you're in your BIOS theres a menu called Cell Menu, in there theres overclocking options, and theres a memory section there. the board doesn't support 1866 on autodetect you need to go in there and set it to 1866.

EDIT ok I was slow on the reply, yes the MC of your CPU may not be able to handle the speed

goobawhoba · Jul 11, 2015

Rogue Leader :

Yeah since I am in the process of building an expensive computer I am going to hold off on buying a new CPU but I am thankful for the help, I never knew a CPU had restrictions on RAM.

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