A 4000+ desktop processor is 2.6 GHz 62 watts
The MT-40 is 2.2 Ghz 25 watts
Both have a 1 MB Cache
Another thing you didn't ask about, but is worth mentioning is that the new ML-44 is a 2.4 Ghz 1 MB cache chip that uses 35 watts of power, possibly a closer match, but is very pricey and hard to find.
The ML-42 is 2.4 GHz with 512 kb cache (but performance wise very close to the ML-44 because the cache on a Turion or Athlon does not have a humoungus impact on performance, due to the onboard memory controller). The ML-42 is a cost effective way to add the clock cycles back to your gaming beast and still not hold a gun to the head of your battery.
I think your cost in battery performance is not worth the couple clocks you're picking up with the more power hungry Athlon Mobile over either of the Turion family ML or MT. I mean, it is a notebook, it probably has a big role in your life aside from gaming, namely mobility, and to work on the go you don't always have power available.
Gaming and web surfing would be my main use on this laptop. In that order.
Mobility is what im wanting. I would most likely never have to use the battery if i didnt want too.
But if the performance difference was so unoticeable id just buy the mt40. In case one day the battery life actually started being somthing i needed.
Anyways thks for the info ive already gotten. And thks in advance for any future info on this matter.
btw here some of the games i would be playing. Dark Age of Camelot, World of War craft , Vanguard when its released. MMORPG (pVp ofcourse)