Novice memory question ....

[rdrbill]

I want to upgrade the memory in my 660E (55U). Can virtually any PC100 128MB SODIMM be used as long as its non-buffered and non-ECC ?

Thanks - Bill

[Laptop_wizard]

First off, I think you mean a "600E" right?

Second, Yes any "brand" will work if that's what your asking .

[pianowizard]

I agree, the 600E is less picky about 128MB sticks than 256MB ones. If you want to use 256MB modules, you need to make sure it has a total of 16 chips, which makes it low density.

[pianowizard]

Wow, I just noticed that two wizards have responded to this thread!

[rdrbill]

Yes, 600E is what I meant. I noticed that some manufacturers of memory modules specifically offer a "01K1150" memory which tends to be more expensive than the general purpose 128MB modules they offer. So I was wondering if there was anything special about the memory used in the Thinkpads or was it "industry-standard" 144-pin SODIMMS. Thanks.

BTW- does anyone know if IBM ever put the "tactile feedback" Trackpoint stick in production?

[rdrbill]

Another question for the wizzards... One mentioned using 256MB modules. Is there a physical limit of 288MB on the DRAM interface? (32MB + 256MB) or can it actually support more memory ? Thanks again.

[tfflivemb2]

Most 600Es accept up to 544mb ram (256mb X2, plus 32mb onboard). The exception might be the 55x and A5x series. They even have a different BIOS than the remaining 600E models.

The 55U that I have seems to be limited to the 288mb limit. When I place a 256mb low density stick in by itself, it will still only registers half the stick. For the record, I have even tested the ram chip in a different system and it registered 100%.