"Firstly, my CPU fan "blows" cold air onto the CPU heatsink, where as my old one "sucked" the hot air out. Does it make much of a difference in which direction the air flows?" That is normal with coolers these days . "Secondly, is it better to view the temperature of your CPU/RAM etc. through the BIOS, or through a program? Is one way more accurate than another?" It’s the same and it’s crap, they use the same sensors en the readout through the BIOS, always it’s an indication of more or less 10oC accuracy... "Lastly, what's considered an average temperature for a CPU? I want to make sure I did a good job with the thermal paste stuff." Who cares, if it doesn’t crash with a 24h burn in test it’s okay ... "Anyway, thanks again for all the help. Hopefully I'll be posting from my own computer soon." Your welcome... ow that wasn’t a question ...