i tried to upgrade myThinkpad 390x (PII 400MHz) with a 256 MB PC133 SO-DIMM module (in the other memoryslot there was a PC100SO-DIMM with 128MB). My 390x boots up and recognizes about 384MB ram. But when it comes to grub (the Linux operating system loader) then it hangs. If I boot my 390x only with the new 256MB PC133 module (after removing the old 128MB PC100 module) then i get even at the boot only a blackscreen.
As i read in the "i440bx chipset RAM module compatibility FAQ" there is the statement "Every PC133 Dimm is backwards compatible to PC100", seen at . But I also heard from someone that it is not possible to run an old i440bx based notebook with PC133(SO)DiMMs. Is it true? If not how can I upgrade my 390x with a 256MB PC133 SO-DIMM module? Do I have to use the 390x own bios hex editor?
Sorry for my bad English.
 http://homepage.hispeed.ch/rscheidegger ... ble._But_I