Entire amount of memory not recognized

By delynn10 ยท 6 replies
Apr 1, 2007
  1. I have a Compaq Presario2100US laptop (Win XP, Serv. Pack 2) 1.6MHZ. It had 1 stick of PC2100 256MB memory. I ran a scan on the crucial website that showed a max allowable amount of memory of 1GB. I purchased a stick of PC2700 512MB of memory and installed in the open slot. The computer only read the new memory as 256MB. I tried taking out the old memory, but that didn't help. I also looked in the bios, but there isn't a memory setting that can be adjusted.

    Any ideas?

  2. kitty500cat

    kitty500cat TS Evangelist Posts: 2,154   +6

    Hello and welcome to TechSpot. :)

    Depending on how long ago you bought your new memory, you may be able to RMA it for a new stick. It could also have to do with the fact that you have two different speeds of RAM.

    Regards :)
  3. joked u 2

    joked u 2 TS Rookie Posts: 128

    look on the side pf the memory module. look the the numbers 256 or 512 on the sticker. sometimes it will be part of a bigger longer jumble of numbers and letters. you may have got jipped out of the 512 stick
  4. delynn10

    delynn10 TS Rookie Topic Starter

    Everything looks in order. It was definitely a 512MB module with a crucial label bought from tigerdirect.
  5. captaincranky

    captaincranky TechSpot Addict Posts: 13,020   +2,548

    Compacs, they're infamous

    Compac computers are nororius for requiring "branded" memory modules. Some mother boards will compensate for different speed RAM. (I'm tyiping this on such a machine (Intel 915GAG Mobo). I can't hurt to try the 512 in the 256's original slot by itself . Can't hurt and it will tell you if the BIOS is capable of recognizing and/or downclocking the PC2700 DIMM.
  6. delynn10

    delynn10 TS Rookie Topic Starter

    I already tried that, but didn't have any luck. Sounds like I wasted some $ buying the 512MB module.
  7. Tedster

    Tedster Techspot old timer..... Posts: 6,002   +15

    read the installing ram guide in the guides forum
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