256 DDR or 512 SD?

Hello folks I am new here and I am in need of some assistance. Here we go.

I have an MSI motherboard here that is serving as a "Backtrack" PC.
It accepts either SD or DDR and using parts I have here, my options are 512 SD ram, or 256 DDR.

Which will be faster?

The CPU is an Athlon XP and I am guessing that using SD (@133mhz) would lower the CPU's clock speed because the bus speed would be hindered, correct?

Any insight would be appreciated.
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  1. Is it 512mb SD ram or 256mb DDR?

    Then I would go with 256 DDR.
  2. 256 vs 512 ?
    I would choose 512SD RAM...Both are slow but 256MB will be too less.
    At least 512MB will be sufficient for basic tasks.
  3. all DDR memory is SDRAM anyway (the actual technical term for DDR RAM is DDR SDRAM)... so go for the 256MB DDR, it will be a lot faster ;) but i would install windows 2000 for it to perform its best
  4. Thanks for the replies folks. The actual installed OS on this PC is XP. I just run backtrack from CD when needed, however, the performance in Windows XP is not my concern, it is what will work best for Backtrack.

    So, judging by the responses here and my own testing, I am going with the DDR and I will throw the SD back in the my stockpile.
  5. I doubt running slower memory will lower the CPU's clock speed. As far as I know those things are decoupled. Slower memory will just report to the CPU less often, but the CPU should be hitting it's onboard cache memory most of the time.

    Off the top of my I'd expect the DDR ram to give the system an overall performance boost of around 10%. However if it ever tries to use more the 256megs it'll start using the harddisk which is about 1000 times slower than ram.

    So with the 256 of ddr your best case is a little faster, whereas with 512megs of sdram your worst case is several orders of magnitude faster.

    You just need to find out how much memory backtrack requires, if it's ever over 256megs go with the 512megs of sdram.
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