Currently, my system is running 32bit vista on 1GB RAM, 64bit dual core 2.8GHz, GForce 7300LE The pc is using 50% on idle. Will buying extra RAM improve the speed of the computer? If you fill a computer up with as much RAM as possible, will the computer use all the RAM you have installed? If so, how much RAM do computers use? I have four RAM slots in my MoBo, does this mean its dual channel? I have heard that the maximum RAM 32Bit can handle is 4Gb, then 8Gb for 64bit. is that correct? If so, is it best to get two 2Gb sticks? Do these only work in dual channel? If the time comes where everyone upgrades to 64bit, I won't have to replace 1Gig sticks to get over 4Gig of RAM, I could just stick some more 2Gig sticks.