Memory Upgrade from 1GB to 2GB - but only 512MB recognized!

[flassen]

Hi,

i have a strange phenomenon. I purchased a Kingston KTM-TP3840/1G RAM in addition to the default memory module (Hynix 1GB 2Rx8 PC2-4200S-444-12).

If I insert just one (in either bay - extra or below the keyboard) - 1GB is recognised. If I insert both, the system (BIOS, Windows, Ubuntu) only recognise 512MB. I have swapped them around, to no effect - there are no warning sounds, memtest runs smoothly. I have upgraded to latest BIOS and all.

Any ideas? Thanks a lot in advance + best regards,

Fredrik

[Beaver]

The do not like each other. If possible, try to sell your old memory module and buy the second new one (the same one as you bought already).

[Johan]

First, you really should tell us what type of ThinkPad you have? Since you post here in the T4x forum I guess it is a T40/41/42/43 with a T43 being most likely owing to what you say about "PC4200". People have reported similar troubles before; see the thread What RAM for T42 ? Tried some, but they didn't work . Also, the thread T42 might be of interest. - what variation in RAM specs can you use?.

And, ooh, by the way: Welcome to the forum!

Johan

[Tim M]

A long shot, but do you happen to have trouble hibernating with the RAM installed as well? That said, I do find it more likely that you have a damaged or incompatible stick of RAM.