4 sticks of DDR2 800MHz memory only going at 667MHz

Discussion in 'PC Hardware' started by bojack13, Oct 25, 2014.

  1. bojack13

    bojack13 MDL Novice

    Mar 26, 2014
    Please help. I have 4 sticks of DDR2 800MHz memory that are only running at 667MHz.

    No you did not just time travel back to 2007, yes I know I have an ancient PC.

    2 sticks of OCZ 1GB 6400
    2 sticks of PYN 2GB 6400

    Please Note: I've tried each pair separately and each pair by themselves will run at 800MHz.

    EVGA Nvidia 680i mobo (122-CK-NF68)
    Intel Core 2 duo 2.4 CPU
    Geforce 285 GTX
    Windows 8.1 64-bit

    All default settings, no overclocking, updated mobo BIOS

    I've checked the mobo's manual and I'm sure I have the placement right (generic brand at 0 & 2, OCZ at 1 &3, tried OCZ on 0 & 2 as well) and I am seeing 6GB of memory during bootup and in Windows. As I said I've tried each pair individually and they will run at 800MHz if it's just the 2GB OCZ pair or just the 4GB generic brand pair.

    I noticed that if I go into BIOS and change the FSB Memory Clock Mode from 'Auto' to 'Linked' I can change the FSB speed, which changes the memory speed. If I change the FSB from 1066 to 1280 the memory speed changes to 800MHz. This changes my CPU speed as well though from 2400 to 2880. Would these be major changes and would I be pushing my system? Never overclocked anything before. Also, I'm not sure why I'd have to do this to get 800MHz when each pair individually got this speed by default.

    If I can't fix this then which is better: 4GB @ 800MHz or 6GB @ 667MHz? I'll be using this computer for gaming. It actually can run games from within the past year at decent settings.

    Any help would be greatly appreciated. Thanks for reading.
  2. EFA11

    EFA11 Avatar Guru

    Oct 7, 2010
    run the 6gb at 667mhz. More ram for games is a plus, the 800 vs 667 difference on that system is negligible. Unless you are a tweaker who plays benchmarking games instead of real games, I doubt you will notice anything.