I have a Pentium4 2.8ghz processer, 512mb PC2700 DDR SDRAM 184-pin at 333 speed. It supports 1gb Ram or two 512 cards (I still have one DIMM slot open). the computer is a HP pavilion a712n. I got this info from the hp site.
Here's the thread:
http://h10025.www1.hp.com/ewfrf/wc/g...reg_R1002_USEN
My computer is still stock.