Thinkpads Forum

What kind of ram do i need for my thinkpad 600. And is it pc100 or pc66 ram

A TP600 requires PC66 144pin modules.

It is possible to use PC100 ram if it is backwards compatible. Most of the modules I have come across are.

Can it take 256MB modules?

Yes, if it is anything like the 600E, it should be able to use low-density 256MB PC-100 SODIMM ram chips. The computer may need the latest BIOS in order to use those chips though.

The 600E uses the PIIX4E controller, and the 600 uses the PIIX4. It may or may not take 256MB PC100 parts. I'd suggest you buy from a place that will guarantee the parts to work (which isn't likely because IBM and Lenovo say that only 128MB PC66 parts will work), or you take your machine to a local parts shop where you can try the parts on the spot.

I owned two TP600E's before and used 256MB sticks on them. I asked the question because I wanted to know whether the TP600 can do the same. Anyone who actually owns a TP600 who can give a definite answer? And Atlas64, what is the full model number (e.g. 2646-85U) of your TP600? The official specs, such as those issued by IBM/Lenovo, are useless because they were released before the invention of 256MB sticks.

I asked about this a few months back - the response at the time was that the 600 CAN use 256MB modules, but they must be PC66, low density. Something to do with CL2/CL3 (don't recall all the details, though), if memory serves.

I had tried low-density PC133 modules, but didn't have good results. One of these days, I might go looking for the right ones.

Rob

Rob Mayercik wrote:the response at the time was that the 600 CAN use 256MB modules, but they must be PC66, low density.

I've never seen 256MB PC66 modules. They only go up to 128MB.

SOME PC100 256mb Low Density sticks will work, BUT it is very inconsistant. I have tested several 256mb sticks over time, and one stick would work in one, but not another 600, of the SAME model. I believe I tested it on two 45Us, but it was a year and a half ago.

pianowizard wrote:

Rob Mayercik wrote:the response at the time was that the 600 CAN use 256MB modules, but they must be PC66, low density.

I've never seen 256MB PC66 modules. They only go up to 128MB.

Nope, they do exist - saw one for sale on eBay a week or two back.

Just gotta look harder.

Rob Mayercik wrote:Nope, they do exist - saw one for sale on eBay a week or two back.

Misadvertised I guess? Or it could have been 2x128MB. I am pretty sure they don't exist, which is why people always use 256MB PC100 or PC133 on the TP600E.

I have never personally seen a 256mb PC66 ram stick, but according to memorystick.com, they do exist, as made by IBM, too.