I have just assembled a Supermicro C226 board with an E3-1275v3 and absolutely everything works perfectly... as long as I don't install the P4600 drivers. I used both the manufacturer supplied driver and the latest download from Intel. As soon as the system boots to the desktop, it restarts- infinitely. If I delete the driver and set the display to the standard VGA at 1920X1080, everything works great. Could this be an issue with the graphics engine within the CPU?