Transcend 150x 4GB. It works, but it rarely uses more than a gigabyte. You
can check this in the reliability and performance monitor. If you are
thinking about getting a 4 gig card, I would try plugging in a 2GB card and
seeing how much it uses. I have used this same computer with 2 GB of ram
instead of 1 and it rarely uses *any* of the drive as readyboost in that
case. Microsoft could be changing the way this works later, but right now
it doesn't help. In short, get more ram. Readyboost only helps *right now*
(it may help in the future) if you have less than a gig of ram available.
The only exception to this rule is when when multiple Virtual PCs are taking
up the ram, then 2 GB of ram are not enough and readyboost cache begins to
be used. Make sure you remember: the computer first uses system ram and
then uses the flash drive.
Ben