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What is with the heat from M0 stepping CPUs?

  • CPUs
  • Heat
  • Cooling
  • Overclocking
Last response: in Overclocking
January 18, 2008 4:42:19 PM

I been everywhere looking for an answer to this, what is the difference between the other duos and quads stepping compared with the M0 steppings? What is with this heat they release? My E4500 is only at 1.36v and its at 68c Tcase and 81c cores... I seen quads with 1.4v+ generate less heat than this... Iam using the Zalman CNPS9700 NT ambients are 23c. Its not my cooler almost everyone is having heat problems with M0 steppings and the only thing thats fixing it is water cooling which I don't have $ for, nor do I want it. This cooler is a monster as it is. I lapped the CPU and cooler for a 2c drop but temps are still sky rocketing... if I exceed 1.4v Tcase flies off the chat at 81c+.

More about : heat stepping cpus

January 18, 2008 5:01:53 PM

what is temp difference between the idle and load?
can you post the core temp pic?
January 18, 2008 5:25:28 PM


Tcase: 35c
Core 1: 49c
Core 2: 48c


Tcase: 68c ~ 70c
Core 1: 82c
Core 2: 82c

CoreTemp 0.96 and SpeedFan 4.34 beta 37 give the same temps. I do not use CoreTemp 0.96.1 because the tj max is reduced back to 85c for M0 steppings which is incorrect. I am posting from a different machine but thats what the temps are, if you still want a screenshot I will post later. CPU is at 333x10 = 3.33Ghz 1.36v idle/load all other volts stock. TIM is AS5 and I reseated about 15 times not a single degree change.
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January 18, 2008 6:53:24 PM

I havn't heard anything about the M0 stpeeing having issues but its not something I've been looking for. My advise:

1. Check the HSF is seated correctly.
2. Use core temp its more accurate than speed fan.
3. If none of the above have cleared things up RMA the cpu. The temperature diode might be malfunctioning in the cpu (unlikely). Or the cpu is just plane buggererd. Get you money back or exchange for another or different non-M0 stepping cpu.
January 21, 2008 11:06:52 PM

the delta temp is way too much, few more questions:
so does cpu fan speed stay same between idle and load?
what will happen if you took out the side panel?

January 22, 2008 4:02:22 AM

The delta temp is way too high which usually means bad seating of the HSF.