I had an A4000 at one time. I'd have to say yes, that the 040 CPU has some kind of thermal throttle. It had a heat problem. The case would get hot. Hotter than I though it should be. After about a half hour to an hour, depending on the ambient temp, I noticed that it would slow down. Especially on hot summer days when it would come to a complete hault. After I install a 80CF/M case fan, the CPU had a HSF, I had no more heat problems. The case always felt cool after that.
