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Can't get Asrock Mem Speed above 153Mhz

Discussion in 'Memory' started by Frank_Rizzo, 19 May 2006.

  1. Frank_Rizzo

    Wise Guy

    Joined: 18 Mar 2003

    Posts: 1,128

    Asrock 939NF4G-SATA2 with 2 x 512Mb Corsair Twinx 2-3-3-6 ram and 3800+ X2 @240Mhz

    What ever I do the ram bus speed is always 2x 153Mhz (306Mhz data rate)

    Have set ram speed to auto, 166,200. Have set CPU bus speed to auto, sync, async but it always forces the ram bus speed to 153 according to Sandra.

    This is the mobo with onbard vga sharing the ram. I know that there is a performance hit with this but surely it should be running at 200Mhz?
     
  2. Minstadave

    Caporegime

    Joined: 8 Jan 2004

    Posts: 29,046

    Location: Rutland

    Try using CPU-Z to confirm the memory speed :)
     
  3. Frank_Rizzo

    Wise Guy

    Joined: 18 Mar 2003

    Posts: 1,128

    Still the same with CPU-Z

    Type: DDR
    Channels: Dual
    Size 1024 MBytes
    Frequency: 153.3 Mhz
    FSB/DRAM CPU/15
    Cas# 2.0
    Ras to Cas: 3
    Ras precharge: 3
    Cycle Time (Tras): 15
    Bank Cycle Time (Trc): 22
    DRAM Idle Timer 256
    Command Rate 2T

    CMX512-3200C2

    What I don't understand also is that CPU-Z timings table shows:

    Freq 200Mhz
    Cas# Latency 3.0
    Ras to Cas 3
    Ras Precharge 3
    TRas 8

    So this is rated as 3-3-3-8 @ 200Mhz and yet the spec of this ram is 2-3-3-6 :confused:
     
  4. Frank_Rizzo

    Wise Guy

    Joined: 18 Mar 2003

    Posts: 1,128

    I reverted the CPU speed to normal and now get proper memory speed so it looks as if the mobo was putting in too high a divider.

    O/C'ing back to 230 FSB and lowering all the mem settings put in a /10 divider = 230 mem bus speed.

    Too bad this mobo is not so flexible on the memory speed option. I guess it's just a matter of trial and error finding the optimum values.