I'm reinstalling a friends (very) old laptop with Windows XP. I recommend he upgrade the 512MB RAM in order to keep both sanity and general well-being.
It's an Dell Inspiron 8600, and the manual (sorry, that's a 3,5MB pdf, but check out page 128 for the specs) says it supports a maximum of 2GB 333MHz DDR SDRAM (PC2700) RAM. However it turns out those modules are impossible to find today.
What other newer types of RAM can I safely use in this machine?