DDR3 speeds


i7 930, ASUS P6X58D, Corsair XMS3 DDR3-12800 1600

I have the CPU overclocked pretty high and in conjunction with that the system does not like higher memory speeds. I have the DRAM voltage set to 1.64, and QPI/DRAM frequency set to 1.35. These are the setting to implement higher speed memory frequencies, or so I understand.

The memory perfers a 6x DRAM multiplier rather than an 8x. This effectively means that when I OC at 4.0+ my memory frequency is around 1200 instead of 1600.

Does this make an effective difference?

At 1200Mhz am I then running the RAM at DDR3-10800?

Also I noticed that there is dual and triple channel DDR3. Am I at triple channel as I have a 3 x 2GB configuration?

My preference is to OC at 4.0+. If I drop the processor down to the 3.6 to the 3.8 range then I can get the 1600Mhz. But it seems like there is more benefit with the higher overclock.

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  1. I don't have much help to give you, but from what I have heard, I would say that the difference between 1200 MHz and 1600 MHz in gaming, as an example, would probably only be around 4 frames per second or so. So in any other real-time app. or otherwise you may not benefit very much from this jump in RAM speed.
  2. Best answer
    1) You want triple channel memory for X58, so you are good to go there...

    2) ^+1... It will have little impact between 1200 & 1600 in real life performance. You'll only see a measurable difference in benchmarks... IMO.
  3. There is something else....

    At the higher DRAM Frequency the CAS is 9,9,9,24 (what the mem is rated at) but at the lower frequency CPUID reports it running at 8,8,8,20.

    So it is running at a lower frequency, but at a faster transfer rate?

    Is it really running at CAS 8 even though it is spec'd at 9?
  4. Yes... As you decrease the RAM speed from what it is stated out, it typically runs at a better/lower CAS level.
  5. Best answer selected by jerryl.
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