Can you give me pictures of your BIOS setup? If you dont have the right kind of memory configuration to CPU speed it can mean problems. How big is the cache on your intel chip? The problem with the intels is that they have a super long pipeline compared to AMD chips. Someone also said something about the memory controller which is true too. Do you run system stability benchmarks? What are your memory test benchmarks.. Give me some more info then I might be able to help. It most likely has nothing to do with your video settings.. a 1900 should run everything you throw at it. It is mostly likely having something to do with your mobo, processor and or memory. PSU looks like its ok but not for sufficient for the type of system it sounds like you want. Get back at us.