I know very little bout computer, but I'm trying to build a new PC. I'm planning to have the following hardwares (and I'm finding all the numbers very confusing): 1)Intel Quad 6600 Processor (supplier suggested the Intel Xeon Quad x3210/2.13MHz); 2)Intel Dx38BT Motherboard; 3)Kingston HyperX KHX9600D2K2/2G DDR2 1200 RAM (supplier suggested Kingston KVR1333D3/N9K2/2G DDR3/1333 Mhz); 4)Nvidia N9600GT T201G 1024MB Graphics Card; 5)Western Digital WE Caviar SE16 320GB x2 HDD. Confusion: 1) Processor: can anyone tell me please, I thought Intel Xeon is a server processor, what's the difference? 2) I looked up Intel website on the kind of RAM the motherboard supports, and I don't see DDR3. And I don't even know the difference between DDR2 and DDR3! Can anyone tell/ help me with the choice of processor and RAM please? Somehow, i have a feeling that the dealer is not being very honest.