05-02-2012 04:42 PM - edited 05-02-2012 04:54 PM
Hello and welcome,
A quick search of the board turns up this thread: T400 Max installable memory?
I'm certain a T400 can support 8G of ram, because that's what I'm running in mine. Haven't found a clear answer re 16G.
 If you run a 32-bit OS, you won't get much more than 3.5G of usable RAM, no matter how much you install.
This is the RAM I'm using: Crucial 8GB (2 x 4GB) 204-Pin DDR3 SO-DIMM DDR3 1066 (PC3 8500) Laptop Memory Model CT2KIT51264BC106...
There have been several reports of incompatibility problems between ThinkPads and Corsair memory, although some user's report no problems. It's probably a good idea to stick with Crucial or one of the other major brands.
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09-20-2012 04:08 PM