Another 670 user here (the Gigabyte windforce model). I downloaded the files Aleemz0z linked below and they seem to be working fine.
I am using iStat pro as an interface, and prior to installing the files below, I only could see HDD temperature. Now I can see the following:
HDD
CPU A
CPU B
CPU Heatsink
GPU
Northbridge
Not that I mean to highjack the thread, but why am I recieving info for a CPU "A" and also a "B"? I only have the one 3770k, so I'm assuming it must be some other component related to the CPU...but what?
As far as the topic at hand goes, I think the GPU temperature displayed is accurate. I'm at 34 Celsius as I type this, and I'm only running Safari, so that seems to make sense. Running LuxMark, it floated in the mid-fifties, which, again, seems to be accurate.