Allendales that are the L2 revision have an 85C Tjuction. They are the E4300, the older E4400,and the Early E2140 and E2160. Allendales that are the M0 revision have a Tjunction of 100C, they are the newer E4400, all E4500s, newer E2140 and 2160s, and all E2180s and above.
For clarifiation, please review the Intel CPU Specs:
Compare the Allendale (L2 and M0) IntelÂ® Coreâ„¢2 Duo Desktop Processor
Compare the (L2 and M0) IntelÂ® PentiumÂ® Dual-Core Desktop Processor
The key is their max temps..