How do I confirm I have PC2700 and not PC2100?

I just bought two PC2700 512MB DDR SDRAM from two different sellers on Ebay. How do I make sure that I have PC2700 and not PC2100 SDRAM? There is no marking on the chip to indicate one way or the other.

---Hello? Tech Support? I think the reractable coffee cup holder on my computer is broken.
5 answers Last reply
More about confirm pc2700 pc2100
  1. try sandra it identifies module speeds and gives other info.


    "A very popular error: having the courage of one's convictions" - Nietzsche
  2. I am assuming you are referring to Sandra Standard by 3b Software. Unfortunately their download site is down. I guess I will have to try later.

    Thanks for the info.


    ---Hello? Tech Support? I think the reractable coffee cup holder on my computer is broken.
  3. Look at the individual DRAM chips on the DIMMS.

    If the last code number ends with "-75" this means 75 ns which corresponds to 133mhz, PC2100.

    If the code is "-6" this translates to 6 ns, 166mhz, PC2700.

    A smaller code number means even faster DRAMS.

    Some PC2700 memory was overclocked. That is, slower rated DRAMs were used. If the speed code is larger than 6 ns then the DRAMS have to be overclocked to reach PC2700 speed, 166 mhz.

    <b>I have so many cookies I now have a FAT problem!</b>
  4. On one DDR chip, the number is ending with -7. I guess that means PC2400?

    The other DDR chip has heatsink glued on, so I can't even see the individual dram.

    Since I am not an overclocker, I am little confused. I thought the over-clocking memory is done on the motherboard and not directly on the memory, no? So when I get hold of Sandra program and if it says they are PC-2700, then it would be OK?

    I just bought ASUS A7V333 motherboard for these ddr's.

    Thanks again for all your help.


    ---Hello? Tech Support? I think the reractable coffee cup holder on my computer is broken.
  5. Quote:
    On one DDR chip, the number is ending with -7. I guess that means PC2400?

    Actually, "-7" means it's 7ns DRAMs, spec'd for 142 mhz operation. Ideally, PC2400 (150mhz) memory would have 6.5 ns DRAMs, good to 153 mhz.
    Quote:
    Since I am not an overclocker, I am little confused. I thought the over-clocking memory is done on the motherboard and not directly on the memory, no? So when I get hold of Sandra program and if it says they are PC-2700, then it would be OK?

    I guess it depends on your definition of overclocking. To me this means running a component, any component, above its recommended or specified speed. For memory, the manufacturer may certify the module as a PC2700 module (166 mhz) but if the individual chips (7 ns) are spec'd to run 142 mhz but the module needs to run 150 to reach its rated speed then I call this "overclocked".

    I hope this makes my meaning a little clearer.

    <b>I have so many cookies I now have a FAT problem!</b>
Ask a new question

Read More

Memory SDRAM