These should be ok. You should check to see if you have DDR1 or DDR2 first because the slots are not the same. Download SiSoftware Sandra Lite XII.SP1 to analyse your system. =)

http://www.softpedia.com/progDownloa...load-5280.html

8600GT 512mb
http://www.newegg.com/Product/Produc...82E16814130290

1GB DDR 400 (PC 3200)
http://www.newegg.com/Product/Produc...82E16820134008