My mobo was MSI 865PE Neo2. I also bought the Geil dual channel 512MB DDR500 (PC4000)at the same time. I did not know the mobo recommend use only DDR400 (DDR433, DDR466, DDR500 and DDR533 are recommend for OC spec only). I installed it, and now I wondering that is there any problem to my mobo or my RAM when I don't want to OC it? I'm planing to upgrade my RAM to 1G. What should I do? Still buy DDR500 or change to DDR400?My mobo only recgnize at 400Mz. What happend to another 100Mz? Please help!