When i have 2x2 gb installed. Why is this? Is 3.25gb good enough? thanks
If you are using a 32 bit version of Windows, you are limited to a max of 4 GBs, out of these 4 some are reserved for the memory on your video card as long with other resources of your PC, my guess is you have a video card with 512 MB of memory.
To get full use of your memory, you will need a 64 bit version of Windows.