Upgrading RAM?

[ZMan2k2]

As some know, I've recently got a new-to-me computer, that I'm looking at doing some upgrading to. I downloaded a program called HWiNFO32, to get some information on the hardware in the system. It tells me that I'm running 1GB of RAM at the moment, which I knew. Now, I'm thinking of moving up to Vista, and I'd like to get some more memory before I do this. Currently, what the HWiNFO32 tells me is that my RAM is "PC3200 DDR2-SDRAM" and I'm running two 512MB chipsets. Now I'm looking at this stuff from Memory Express which is PC2-5300RAM. Would I need to toss the RAM that's in the computer now in order to use that RAM, or can the two types co-exist?

[punky]

depends on ur motherboard, if it support PC2-5300 then u can replace them,
but i doubt that your motherboard support 5300 and 3200.
you'll have to get pc3200 .

[ZMan2k2]

Yeah, I kinda figured it would have something like that. Sigh, looks like I'm continuing the search. Thanks.

[Doh]

I just bought PC 3200 on Ebay fairly reseasonable but with 2 512 sticks you may need to look for 2, 1024 sticks, with a motherboard of that age.