Intel's DX4s are 3.3V Yup. It needs to be the Intel DX4 OverDrive, which is compatible with 5V. It looks a bit different, with writing on the cooler and some electrical components for converting the voltage. Pardon the necrobump - I've tried the Intel OverDrive DX4ODPR100 SZ959 V1.1 but it doesn't …