I'm in the process of updating my four year old system. This will include a new Motherboard, CPU, Memory, Video, and HD (if I need to a new power supply). Here is a list of what I'm planning on running CPU: P4, 3.0Ghz, 800Mhz FSB, 1MB L2 cache, HT tec. Memory: 184 pin, 512k, Non-ECC, RDRAM PC-800 Video: nVIDIA GeForce 6600/300MHz, 128MB, PCI-Express x16 HD: 80GB, IDE ULTRA ATA133 The problem I run into is trying to find a motherborad that will run this all. I can find plenty of DDR2 boards, however they have the problem of only running the memory at 400Mhz clock speed. This is unacceptable for me as I want to get the entire system to run at the best clock speed, and I see this as 800Mhz with RDRAM. As a side note overclocking is not an option for me because I don't have enough time or motivation to learn it and do it right. So if anyone can point me in the direction of the motherboard I need or clear up any misconceptions I have about DDR2 please help me.