T-Bird and Duron temps are never accurate. My T-bird 1.1Ghz on a KT7 is 33C idle 48C load. It all depends on were the probe is connected. Newer A7V has the probe under the socket, but it doesn't touch the CPU like the KT7. My friend's T-Bird 900 shows 50C idle. I don't think any MB measure AMD temps properly. If your system is crashing, then it's too hot.
About the week and oc-ability, it's still the luck of the draw. Certain weeks can give you a higher percentage of getting lucky, but there will still be a bad week 37 or bad week 40. I have 4 durons, 2 week 27, 2 week 37. 1 week 27 hit 950 the other only 850. Both my week 37 hit a gig (I bought them guaranteed). Week 37 is supposed to be a good week but I just made sure by buying it guaranteed.
I'm running a Duron 1.05Ghz on A7V older revision, with the thermal probe. So the temp depends on where I placed the probe. The closer I get it to the CPU the more "accurate". But it still never measures the core temperature. My temps read 42C idle 49C load. Does it really matter as long as all my apps and programs are working fine? To me, no.