Thats high to me, I'm using an s939 opteron 175 (105w iirc) nt06 (psu fan cooled) in a sg01e and my load temps are 50-55 depending on ambient temps, idle down at 31C (CnQ enabled).Its not that i care about my electricity bill, but more that my current 5200+ is fitted in a Sugo SG03 case and idles around 41-43 and peaks about 60C during benchmarks which to me is about right and acceptable.
I have seen some boards appear to be registering the wrong temps and working on that assumption I wouldn't expect your rig not to go above 60C (allowing a 10C difference to mine). The change of chip might even allow for a better reading of temps.
Personally though I wouldn't bother with changing unless its being overclocked.