I got the UD5H for the better sound chip and better cooling. Currently have the 3570k @ 4.5 with no problems and 16gb Samsung 1.35v 11-11-11-30 1600mhz ram overclocked @ 1.5v 9-10-10-28 and 2133 mhz. Could I have achieved these clocks/timings with the UD3H and saved $30? Maybe, but for what it's...