virtual memory is the space on your harddrive that your computer uses once the physical memory has run out. so if you have 512mb ram, and you're using 634mb, the extra 122mb is coming off your harddrive. it's slower than the physical memory, and you have to have enough space alloted on the hdd for it. when you run out of the alloted space, you run out of virtual memory.
as far as agp goes, that's a pretty good card. i think there are only 1-2 cards faster for that platform. you're lucky you got one, it's pretty hard to find good agp cards these days.
as someone said, you'll definetly get more performance out of it, as long as your rig is fast enough to keep up with it. if you're using a 1.2ghz celeron and 256mb ram with that card, it's like throwing a ferrari motor into a pinto. ya it's fast, but you're not gonna be able to take advantage of it. well, ferrari is being generous, i'll call it a 6cyl mustang enging :)
edit: overclocking is making a component run faster than what it was originally intended to. your core clock is 420mhz, and your memory clock is 800mhz (effective, 400x2). you see where it says (400mhz standard) by your core clock? that means that the standard clock for that chip is 400mhz, and it's already been factory overclocked (oc'd) to 420mhz by the 3rd party manufacturer. a modest 20mhz overclock. if you have adequate cooling, the proper software, and the balls for it, you can push the core and the memory to it's limit.
Last edited by SacredTbag : 03-28-2007 at 08:33 AM.
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