I have an old HP Pavilion 512n that had two sticks of 128mb ram and I just put in the max of two 256mb sticks of ram but the bios doesnt recognize them? It still reads both sticks of 128mb and windows xp only reports 256 total ram. I disabled quick boot so it could do the memory scan and it still reads as two 128mb sticks? The bios is the latest version. So is there anything I am missing? Every other computer I have upgraded the ram in automatically recognized it and I had no problems at all. The computer posts and runs fine, it just doesnt recognize the full amount of ram. And all of the ram is known to be good. I have tried put every stick in each slot in every combination possible so whats the deal?


Here is what the ram says on the sticker on the sticks

The old ram
128mb, SDR DIMM, G
barcode
16ZGS STK 4306185


Newer ram
256mb, SDR DIMM, H
barcode
32WHS PO 117282.3



[Edited on May 25, 2009 at 8:31 PM. Reason : ram specs]

5/25/2009 8:07:02 PM

also the bios displays 256 total at 100mhz (128 and 128)

all 4 of the sticks I have are 133mhz including the ones it came with from the factory.

5/25/2009 8:47:21 PM

It appears that the RAM you're trying to use isn't compatible with the motherboard.

5/25/2009 9:14:40 PM

i dont see why not, i mean it post and runs fine. The only problem is the computer still thinks it is the old ram. it is sdram 133mhz 168 pin. thats what this computer takes.

5/25/2009 11:30:10 PM

Are they SIMM's or DIMM's?

[Edited on May 26, 2009 at 12:18 AM. Reason : not that it has anything to do with anything.]

5/26/2009 12:17:41 AM

Quote :

"The old ram 128mb, SDR DIMM, G barcode 16ZGS STK 4306185 Newer ram 256mb, SDR DIMM, H barcode 32WHS PO 117282.3"

5/26/2009 1:45:29 AM

man i don't know nothin bout nothin son.

5/26/2009 8:29:00 AM

This could be an issue with the number or size of banks on the module. Some older boards only support 2- or 4- bank modules with a maximum bank size, while some newer modules are single bank or exceed that bank size and may be detected as smaller than they are or not at all.

5/26/2009 9:23:21 AM