So I went out and bought another stick of 1gb ram. Its kingston ddr2 value something. Now that I have it installed im getting random CTD's with games and a few lockups. I noticed the sticker on the old samsung ram says pc5400 and the kingston stick I just installed says 5300. Both of these sticks are listed as compatible with my motherboard in the manual under the 667 column.
Could this be causing my woes? What else should I look at?