A HEAP of heat problems with Intel’s E8400 microprocessor are being reported on a host of hardware forums.
Users are claiming that the sensor diodes aren’t up to scratch and that’s causing the overclockers to get overheated themselves.
That’s not something Intel is admitting. A response from an Intel techie to a user over at OC Forums claims it has nothing to report on sensor problems but that just seems to be adding fuel to an already crackling blaze.
A search on Saint Google reveals there’s plenty of heated discussion raising people’s temperatures around the world. µ
See Also
Intel
hit by CPU shortages - report
http://www.intel.com/support/processors/sb/cs-001614.htm
Can Intel® processors be overclocked? 

Intel® processors are validated and supported only when they are operated at their factory rated settings. Operating a processor faster than it was designed (overclocking) can cause permanent damage to the processor, and possibly other system components including the motherboard. Other negative results are possible including the inability to boot or calculation errors. Operating a processor outside of specification will likely shorten the life of the processor, and can also void any available processor warranty.