I had the same temperature issue with 16.B04 vs. 16.B03. Q6600 cooled by a Thermalright Ultima-90 at stock speeds and voltages (everything at auto) showed ~50-55C at idle. I checked the heatsink, reapplied thermal grease, and the temperatures didn't change. Flashed to 16.B03, and idle temps were ~30-33C. I left 16.B03 on so I could monitor temperatures more accurately (hopefully) while overclocking and stressing the CPU.