You should download this little utility called TCaseMax:
http://www.thecoolest.zerobrains.com/forums/viewtopic.php?t=83
It will tell you specific information about the thermal design of your cpu. The software will show TCaseMax and TDP. They are not indicative of how well the cpu will OC but give you an idea of your cpu's design. All of my 146 Opty's (5) were different. e.g.:
CABYE 0540 FPMW...TCaseMax of 63C and a TDP of 61.8 watts...3000 @ 1.475v @ 52C max (the one I kept)
CAB2E 0540 FPMW...TCaseMax of 65C and a TDP of 70 watts...2870 @ 1.375v @ 53C max
CAB2E 0546 UPMW...TCaseMax of 59C and a TDP of 50 watts...2800 @ 1.525v @ 48C max
The CAB2E 0540 ran quite a bit warmer than the rest (+3-5C at max load at same frequencies)) but was super stable at high temp (50C) and required the least volts. I would have felt comfy running that cpu up to 60C. The CAB2E 0546 was the coolest running 146 I had but required the most volts. I am under the belief that at long as the voltage is at or just above stock, OC the cpu to all it will give you and don't worry about the temp as long as you are under 60C. I am more concerned with voltage than temperature, but that's just me....
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