The GIGABYTE X99-UD4P was a touch less power hungry than the ASUS X99-Deluxe. While sitting idle, the ASUS X99-Deluxe never dropped below 80 Watts at the wall, the GIGABYTE X99-UD4P dropped down to only 67 Watts and stayed there for the time I watched the meter. To put a load on the CPU, I fired up the latest version of AIDA64 and ran the system stability test. The system stability test puts a load on the CPU and is also great for checking the stability of an overclock. With the Intel Core i7-5960X loaded up, the GIGABYTE X99-UD4P was pulling only 180 Watts at the wall, 9 Watts less than the ASUS X99-Deluxe running the same test. To take a look at the power draw while gaming, I fired up Futuremark 3DMark Firestrike, while that was running the peak power draw on the GIGABYTE X99-UD4H was 252 Watts, the ASUS X99-Deluxe was 11 Watts higher at 263 Watts at the wall.