Help with finding the right memory

I'm trying to speed up a relatively old PC by installing additional memory, but I'm confused on the appropriate amount/type of RAM to install. Any suggestions are greatly appreciated.

Specs

Windows XP

Motherboard
-ASUS Tek Computer Inc
-Model: K8V-MX
-Version: REV1.XX
-2 Memory Slots

CPU
-AMD Sempron 3000+

RAM
-2x256 MB DDR (PC3200) 200 MHz

 

Crucial says it will take up to (2) 1gb sticks of DDR PC3200. You don't have to buy it there but it is a reliable site and the price isn't too bad for DDR memory which is getting more expensive as it becomes less available. That $65.99 is for two modules. You don't have to install in matched pairs so you could get just one module which is probably enough to make give your OS some breathing room if you don't run a lot of memory intensive applications at once.

 

I have only two memory slots on my motherboard, currently with 2 256MB sticks. Would I be better off buying a 1GB stick, and keeping one of the 256MB sticks in, or buying a matching 512GB set? I'm not sure I want to pay for 2 1GB sticks...

 

Here's your mobo and it indicates 2GB max:

http://asus.com/product.aspx?P_ID=dJ2XP7zr8tzeYbLp&content=specifications

Wow thats crazy the cheapest I can find is ~$55:

http://www.newegg.com/Product/Produ...7&bop=And&ActiveSearchResult=True&Order=PRICE

I would be looking for some 2nd hand modules as it is DDR. There would be abundance at forums, PC fairs, etc. You should be able to get it for $20-30.

DDR400 2x1GB would work by "their" specs".