E8500 OC'd - Are these temp readings right?


Aug 18, 2008
Hey guys just a quick question, Ive overclocked an e8500 to 400FSB, which is 3.8ghz.
To cool it im using a zalman 7700.
My question is what temperatures should i be seeing? Using speedfan, im getting readings in the mid 40's for the two cores while idling, and im getting around 28-29 CPU temperature. When i load up a game, the two cores temps just to the mid 50's.

I am just wondering if these temperatures are normal, and should I be paying attention to the core temperatures or the cpu temperature?

thanks in advance


Aug 18, 2008
i ran a stress test with prime95 and reached temps of 64-65C.
I've read that the max temp for my processor is around the 72 mark.


Intel Master


Your statement shows a common misconception concerning Intel's Thermal Specifications. While I appreciate iluvgillgill's input on these temperature threads, he usually prefers a brief general comment, rather than writing a complete explanation. Allow me to clarify.

There are 2 seperate sets of temperatures for all Core 2 Processors; CPU temperature (Tcase) and Core temperatures (Tjunction). The Thermal Specification shown in Intel's Processor Spec Finder - http://processorfinder.intel.com/details.aspx?sSpec=SLAPK - is for CPU temperature, not Core temperatures, which is an important point that many users don't realize.

The difference between CPU temperature and Core temperatures is 5c at load, which is illustrated below: From my Core 2 Quad and Duo Temperature Guide - http://www.tomshardware.com/forum/221745-29-core-quad-temperature-guide

Section 6: Scale

Scale 1: Duo
E7200: Tcase Max 74c, Stepping M0,TDP 65W, Idle 8W
E4700: Tcase Max 73c, Stepping G0, TDP 65W, Idle 8W
E4x00: Tcase Max 73c, Stepping M0, TDP 65W, Idle 8W
E2xx0: Tcase Max 73c, Stepping M0, TDP 65W, Idle 8W
E8x90: Tcase Max 72c, Stepping C0, TDP 65W, Idle 8W
E8600: Tcase Max 72c, Stepping E0, TDP 65W, Idle 8W
E8x00: Tcase Max 72c, Stepping C0, TDP 65W, Idle 8W
E6x50: Tcase Max 72c, Stepping G0, TDP 65W, Idle 8W
E6540: Tcase Max 72c, Stepping G0, TDP 65W, Idle 8W

--70--/--75--75-- Hot
--65--/--70--70-- Warm
--60--/--65--65-- Safe
--25--/--30--30-- Cool

As you can see, while iluvgillgill's statement is correct with regard to safe Core temperatures, your Zalamn 7700 is classed as a low-end cooler, and really isn't much better than Intel's stock cooler. Check out the following cooler reviews to see for yourself; from my Temp Guide:

Section 14: Recommendations

For information on CPU Coolers, please use the following links:

Additionally, you can calibrate SpeedFan for accurate CPU temperature (Tcase) and Core temperatures (Tjunction) by using Section 9: Calibrations in my Temp Guide.

Hope this helps,

Comp :sol:


Aug 19, 2008
I used those guides to get rid of the e8500 stock heatsink/fan and replace it with a Tuniq Tower 120 w/ Artic Silver 5.

Prior to the transition, the two cores were idle around 50. My last reading was 52/48 with Real Temp. When I would run Orthos to load, the cores would hit into the 90's, and once I saw 100's.

After the transition (transitioned last night), it now runs idle at 37/34. When running Orthos to load, it maxes out in the upper 40's. Definitely better heat dissipation.

I haven't done any overclocking yet. Thanks for the post.