I have a Dell 4th gen XPS system running a Pentium 4 650 3.4Ghz CPU. I recently went onto tigerdirect.ca to purchase a new CPU, and picked out the Intel Core 2 Duo E6750. This has a bus speed of 1333Mhz, which I just read may not be compatible with my current mobo even though it's an LGA775 socket. Did I buy the wrong CPU? Can anyone tell me what the best compatible dual-core CPU would be for this system?