So, a few days ago I installed a 2700x in an ASUS Crosshair VII Hero. CPU temp in the BIOS was always around 32-33C (It's a completely new build). Today it's been around 40-42C the whole day (stuck at 42C now). Temperature in the house hasn't changed, and, besides, it's winter here. CPU is watercooled with a Corsair H150i and I have additional fans and good airflow.
I had it overclocked to 4200 MHz, and even then the temp was lower. Now it's back at stock frequency but still higher temp.
Any idea why that might be?