1. Would 256MB PC133 in the 2nd slot work? or should I bite the bullet and get 2 x 256MB PC133?
Generally, you should not mix different speed modules. Some systems are able to figure out what you have installed and adjust itself to the slowest one. However in this case, I do not believe this is true for the T20. I think the system is locked into using a specific timing. What is important when using PC133 modules is that you use ones marked CL2
and not CL3
. This has to do with what is called the "CAS Latency" of the memory access. Lower numbers are faster parts. Your current PC100 module should be CL2. Whatever else you install should also be CL2. As to the amount of memory, I would say the more the better. Depending upon the operating system you are running and the number of processes executing in the background, 384MB may not be enough. I know for some demanding programs, 512MB is a minimum amount. Your call.Edit Jan '08: Note, please disregard my comments about sticking with CL2. The T21 and T22 systems can use CL3. I'm assuming that with the same chipset, that the T20 would as well. Ray
2. I think the Crucial chips are SDRAM [?] whereas what I have I think is SDR. Same difference? Does it matter?
Same thing: SDRAM = SDR = Synchronous Dynamic RAM, not to be confused with DDR (Double Data Rate).
3. From previous threads 512MB seems to be the max for memory but according to the Crucial scan I have "max 1024MB". I assumed 512 max meant total in both slots or am I missing something?
The T2x series can handle two 512MB modules for a system total of 1024MB. This is what I am running in a T23 at the moment.
4. Should I update the BIOS before? after? inserting new memory? Current BIOS is IBM 1YET43WW [1.07]
Shouldn't matter when the BIOS update occurs, but yours is way old. Current level for the T20 is 61WW [1.22] June 2004.
If I should update, could someone advise where?
Go to the site at:
http://www-307.ibm.com/pc/support/site. ... MOE-3VAM8Y
for a list of all current BIOS updates.