I just learned something new:
I have an HP laptop - model# DV9810US. It has 3gigs of RAM installed as purchased, (has an AMD 2.0gig, 64 bit CPU in it as well), with the ability to accomodate up to 4 gigs. Weds., I was browsing computer products at Staples, on Rte 235, and noticed a 2gig RAM chip on sale for $79.99, so , heck, I went for it. I figured if I wanted to add new software, I would need the extra RAM, on board.
It was the right chip for my machine - DDR2, 667mhz, 200 pin connection.
I installed it, very easily, in about 15 minutes. Re-installed the battery, plugged in the power cord, and turned it on. I went to System Information, and found that while it did recognize the RAM addition - to 4gigs - but it was only utilising 3gigs!
WTF!!
Seems(after talking to an HP techie) that my Vista Home Premium software package - 32bit system, will only recognize somewhere around 3.25gigs of the RAM I that I had just newly installed. I would have to upgrade to a Vista 64 bit software program, for my laptop to fully utilise the entire 4gigs of RAM!
Yeah, I'm going to run right back out there, and purchase a new Vista software program, in the 64 bit version!
Not today!