Hi there, I am Awang, and I came from Indonesia I just bought a 512mb DDR2 533 (PC2-4200) to add the total RAM on my TC4200, unfortunetaely I just found out that the factory supplied ram (in slot 1) is DDR2-400 (PC2-3200) . . . Since I already bought it, I installed it anyway .. and it seems to works OK . . My question is . . is this gonna be risky for me in the future ? could anyone share experience on having 2 different ram speed on laptop for some time . . I just afraid that even it seem working fine, eventually the hardware is pushing themselves to the limit to accomodate this difference (without my knowledge), and it will break down in the future due to it . . . . An will it void my warranty ? Thy in advance for your kind help . . .