Asus b75m-a dont run my memory to 1866mhz

[DrcMax]

hello first of all. my specs are in my sig. i have a crucial ballilstic tracer 2.4gb 1866mhz. and my board is an Asus B75M-A and specs says it can run OC to 1866. am i right? but somehow my pc won't boot up to i was force to downclock my ram so i can boot it up.

so guys am asking why does this happen? specs of my mobo is there but when i try it it won't? is there any solution to run the ram DDR3 2200(O.C.)/2000(O.C.)/1800(O.C.)/1600/1333/1066 as the spec says? how? is it related to my CPU which is a lock I5-3470?

thanks pips

 

[FreshRestart]

First of all the official supported memory by your CPU is 1333-1600 MHz. Running the RAM at frequencies higher than that is not a guarantee since it requires overclocking the memory controller on your processor(CPU/NB frequency I believe) and adjusting voltage which the motherboard might allow, assuming that it does not lock controlling these features.

 

[DrcMax]

so its something to do with CPU as well? as i suspect?

 

[FreshRestart]

Nothing wrong with the CPU. It is simply that it does not officially support the 1866 MHz ram. If you know how to overclock using BCLK, you may be able to get it working at higher than 1866 MHz, some CPU/NB overclocking may help as well. And do not get overworked because of it, you will hardly see any performance gains from running the RAM at 1866 instead of 1600, in fact a RAM module running at 1600 MHz with tighter timing may actually be faster.

 

[DrcMax]

so whats the use of spec published like DDR3 2200(O.C.)/2000(O.C.)/1800(O.C.)/1600/1333/1066 if you cant even "not OC" cuz its already a 1866mhz i just downclock it so it can run 1600mhz to satisfy the MB

 

[Tradesman1]

While the mobo may well support faster DRAM, the key player in running DRAM is the MC (memory controller) of the CPU, generally with Sandyand Ivy Bridge CPUs you need a K model CPU to run 1866 and up as an OC of the CPU may be required, and non-K models aren't really made for OCing. You can generally get a minor OC by raising the BCLK but that also OCs everything else and causes heat buildup

 

[DrcMax]

wow.. thanks that what i really suspects. i just needed confirmation from guys who knows. so lastly. does downclocking the RAM from 1866mhz to 1600mhz also lowering latency or it will be the same cas9? any cons on downclocking?

 

[Tradesman1]

Best way is to set them manually and when time permits play with the timings. Typically if you have say 1866 and it's spec at 10-10-10-30 you can drop them or set manually to 1600 and take each of the first three timings down 1 and the 4th down 2-3 so at 1600 would try 9-9-9-27. Give it a try and if any problems let me know the DRAM model # and I'll help as best I can

 

[DrcMax]

its the 8gb blue orange led of crucial tactical model BLT2KIT4G3D1869DT2TXOB

 

[Tradesman1]

I'd try 1600 8-8-8-24 initially at 1.5