The 1 mm pads are 7 W/mK pads (Rise Ultra Soft: 13012), while the 3 mm pads on the back are 3 W/mK pads. However, the 3 mm pads for the backplate have no impact on cooling performance. They only serve to create counterpressure to prevent the PCB from bending too much due to the mounting pressure of the cooler. We don’t use thermal putty on the GPU coolers.