I have a MacBook Pro running Windows 7 32 Bit (under BootCamp). It is a 4G machine, and has happily been running for 2 years with 3.5 or so usable RAM. I started noticing the fan and hard drive working harder the last couple days, and today noticed that the usable RAM is now only 2.1G.
I looked at the Resources by Connection memory map in Device Manager, and see that 1.8 GB is being assigned to the GForce 330M card (address 90000000-FEAFFFFF). I can only assume that this was not true before, and was, at the very least, substantially less, since I had 3.5 available.
My question is, how can I tell the GForce to stick to a smaller memory footprint? Since I am on a MacBook, I don't think there is any way to disable/restrict it in the "BIOS", as recommended on some sites. Obviously something was able to enable it to request more RAM. (It may have happened after I got a message from windows last week asking if I wanted to disable Aero because I was getting low on memory -- I was running a lot of Visual Studios at once -- and I said yes, then finished what I was doing and rebooted. But I am not sure if that was when it changed.)