Please help with temps on I7 920

Hello,

I have some questions about temps and any help or advice would be very much appreciated. Im running i7 920 on Gigabyte EX-58-UD5. Im planning to OC that bastard but first i want to establish basic temps...and Im not sure which one i should follow. Im also not very clear on what is the difference between CPU temp and Core temp. I assume that the CPU temp is kind of median for all the cores but im not sure about that.

Here are my temps according to different temp softwares - at idle and at full load with Prime95:

The BIOS reading are the same as EasyTune6.

EasyTune6 - came with the MB so i assume it should be pretty reliable:

System - 31C - 31C
CPU - 30C - 43C

SpeedFan 4.37 - i have read about it and it sounds like also reliable software:

Core0 - 22C - 44C
Core1 - 19C - 43C
Core2 - 18C - 41C
Core3 - 20C - 41C

CPUID HW Pro:

Core0 - 37C - 59C
Core1 - 36C - 55C
Core2 - 35C - 57C
Core3 - 35C - 55C

Real Temp - also heard that it is pretty reliable software:

36C - 59C
34C - 57C
35C - 56C
33C - 55C

Core Temp:

36C - 59C
34C - 58C
34C - 56C
35C - 56C

As you can see different softwares show different temps. By the way , when i touch heatsink at idle it is pretty much cold and at full load it is barely warm. I thought that at high temps like 60C the heatsink should be very warm but it is not.
I have Aksa heatsink and i changed stock fan which runs between 500-1500RPM to a different fan which runs 800-2850 RPM. At the full load the fan is running about 2200 RPM.
I tried to OC to 4GHz and then to 3.8GHz but the temps were vert high - about 80C and higher.
My case has 3 fans: front, side and rear. Plus the heatsink fan so the airflow doesnt seem to be an issue.
S, what temps should i look for at stock option and at OC option??

Please, any advice on stock temps and OC temps would be greatly appreciated.
Thank you.

Hey thanx for the input. i agree that Akasa in not very big and also no the best heatsink out there.
I have read an article about OCing with akasa and it seemed pretty good. They got it up to 3.8 and it was stable so i thought i could pull this off as well.
The idea of 4 or higher is totally out of question.

Here is the link to the article:

http://www.pureoverclock.com/revie [...] 699&page=5