Overclocking e6700

I have an e6700 with a tuniq tower and an antec 900 case. It is overclocked to 3.5ghz with 1.4312 volts.
I was wondering why TAT (Thermal Analysis Tool) heats up my CPU 10 degrees celsius higher then anything, which is also using 100% of my CPU.
Also when running TAT my temps get up to about 63, I mean anything else that uses 100% ex System Tool while benchmarking the cpu by calculating digits of Pi uses 100% but only gets the CPU up to about 50 celsius!(according to Nvidia monitor my system temp is 27 so i use that for ambient, speed fan does not work with my motherboard;says temps are -65 for system and 0 for ambient), is this safe? Is this normal for a Tuniq tower? My friend has a near identical pc but has an e6600 with similar overclock but only to 3.2 because of the 9x mutiplier and his CPU runs full load in TAT at about 45-50. I have tried remounting my heat sink 3 times with no difference am using arctic silver, but I am new and this is my first ever build.

Thanks Mondoman, That is what I thought TAT might be doing but needed someone with knowledge to reply, so you are sure that although my load temps are "Fine" but do you think that they are normal, considering my system?

THE_MACHINE, the following is from the Core 2 Quad and Duo Temperature Guide: http://www.tomshardware.com/forum/ [...] ture-guide


Section 6: Scale

Scale 6: Duo
E6x00: Tcase Max 60c, B2 Stepping, Tjunction Max 85c, Vcore Default 1.3525, TDP 65w, Delta 15c

-Tcase/Tjunction-
--60--/--75--75-- Hot
--55--/--70--70-- Warm
--50--/--65--65-- Safe
--25--/--40--40-- Cool


Section 8: Tools

Note 4: The software utility (TAT) Thermal Analysis Tool at maximum settings will simulate 100% Thermal Load, which would equal Prime95 at 114% Workload ~5c hotter. This provides the most extreme testing available for CPU and system cooling efficiency. Since TAT is coded to measure Notebook temps, it identifies a C2D as Pentium M. As Notebooks have no Integrated Heat Spreader, thermal scaling differs from desktop CPU`s, so TAT indicates ~ 2c lower, and depending on Variables, temps may be Offset by more than 15c. It is therefore recommended that TAT be used for extreme thermal testing only, and temps regarded as unreliable.


If you'd like more detailed information, then please read the Guide in it's entirety.

Comp

Your PS should be plenty (although it's not quite clear whether you are running 2 8800gts cards or just 1). How long have you run Orthos, and which parameter did you use (blend, small FFT, etc)? Remember that games majorly stress the GPU, which Orthos doesn't, so be sure to monitor the GPU temps on each video board. It would also be a good idea to monitor some sort of case interior temp or "system" temp to make sure the case ventilation is sufficient (positioning and airflow direction of case fans matters, not just the number).