[kwlug-disc] Matching memory?

[unsolicited]

I hope to purchase a new laptop soon. It has 2 memory slots, one of 
which comes with 2GB.

What do I need to know / do to match the 2GB to ensure double data 
rate / maximize memory speed?

I have kubuntu on a USB stick, so will be able to fire it up and poke 
however needed to identify whatever can be.

Yes, SDRAM 2GB 800MHz, but wait states, etc.?