I want to try building a PC. I want to buy a motherboard, CPU and RAM on eBay. I already have pretty much everything else. I'm having trouble telling which chips are compatible with which motherboards. Is there a good database of the specs for various models? Basically, I need to know for a given motherboard a list of supported CPUs, maximum RAM, and RAM type. I've been Googling the various names, but often can't find any information at all.