OK my CPU runs at about 63 degrees C when under 100% load. It's a Pentium 4 Prescott so that's not surprising, and I know a guy who got his Northwood to 90 degrees so I'm not too worried. Anyway, my case has 2 fans in it, one at the side blowing in, and one at the top blowing out. There is a space at the back of the case where I could fit two more fans. Will it make a lot of difference to the CPU temperature if I put some here?