no no no no no...Don't downgrade your memory speed. Even if you chunk in a gig you'll see far less performance (unless you are doing like scientific imagining which has super high texture maps). PC150 is very nice RAM and if you are looking to upgrade there are a few choices. There are PC160 and PC175 versions at
http://ocz.safeshopper.com/?993 and Muskin and Corsair both have pretty good memory. But if your computer is just gonna be used as a general computer (gaming, audio, office stuff, ect) you don't need 1 gig (give it to me,
). I've never used Kingston but i have used OCZstore which is pre-tested and custom built for high performance. Damn, to upgrade from 2 sticks of PC150 will cost a lot of money but i'd go for 384 meg of PC160 (or PC175) if you can afford it.