The golden rules should be:
- unless you are overclocking, don't buy anything above PC3200
- unless you are too cheap to spend extra $5-10, there is no reason to settle for PC2100 or PC2700 so get PC3200
- unless you know what ram latencies are, buy the cheaper, reliable PC3200 from a reputable brand and retailer
- in the time of rising/high ram prices, buying More ram is better than buying Faster or Low latency ram
go to Newegg.com
Go to Memory
Advanced Search...on the left - Select 184 Dim
size 2x512mb
speed PC3200
Price $140 - $160
ahhh...random pick Mushkin Enhanced PC3200 2x512mb - $148
Checkout.
If you arent gaming or doing a lot of other intense stuff, 512mb is enough.
Memory Guide
Basically if you listed your system specs, we'd be more helpful and telling us what you need the ram for?