If I had to guess, I would say that his Prime95 temp is the one that's off. 53C at full load in Prime95 is either a low-speed chip, a really good CPU cooler, or an incorrect temp. I could make a better guess if I knew what his build details are, particularly what CPU and CPU cooler he's using, whether he's overclocking or not, and if he is OCing what his OC values are.