What version of RealTemp are you trying to use and where did you download it from?

Try one of these versions and let me know if either of them work.

RealTemp 3.70
http://www.techpowerup.com/downloads...eal-temp-3-70/

RealTemp T|I Edition
http://www.overclock.net/t/1330144/realtemp-t-i-edition

In theory, either of these versions should work with the new Haswell processors.

I plan to release an updated version once I get some feedback from someone that owns a Haswell CPU.