A31/p RAM limit?

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sjthinkpader · #1 Post by **sjthinkpader** » Thu Mar 20, 2008 8:59 pm

According to www.lenovo.com, A31/p has 1GB RAM limit.

Overview ThinkPad A31/p

But I have a 1GB plus a 512MB SODIMM in my A31 (2652-D5U)

1.5MB

What gives?

#2 Post by **rkawakami** » Thu Mar 20, 2008 9:09 pm

Most likely what happened is that the specs were written in the day when 1GB modules were not yet offered or the BIOS may not have been able to support them. As the years went by (that page you referenced was last updated July 2005) and technology advanced, nobody bothered or noticed that some information had been obsoleted.

sjthinkpader · #3 Post by **sjthinkpader** » Thu Mar 20, 2008 11:15 pm

Great,

That 1GB SODIMM has 16 chips, which is a lot of capacitive loading. The 512MB is an 8 chip SODIMM. This makes 24 device loads on the address bus. I wonder if the machine will boot with 32 device loads.

#4 Post by **rkawakami** » Thu Mar 20, 2008 11:56 pm

Most of the T23s I use have two 16 chip 512MB modules installed in them. I've never had any problems (boot or operational) related to the use of these "lower density" modules; as opposed to using 8 chip 512MB modules. In fact, since the 600X requires the use of low density 256MB PC100 modules AND it has four chips on board, that's 36 devices. Of course that's no guarantee that the newer chipsets didn't skimp on the bus drivers.

ajkula66 · #5 Post by **ajkula66** » Fri Mar 21, 2008 1:04 pm

It will boot. I've got 2Gb in my "main"rig, and have had many with the same configuration.

cmarti · #6 Post by **cmarti** » Sat Mar 22, 2008 12:51 am

Same here 2 gigs on the A31p

A31/p RAM limit?

A31/p RAM limit?

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