Stephen, I have two Acer Extensa 4420's Laptops, AMD 64's 32bit Intel Core2 Duo 1.9GHz with 2GB memory, they both get Hot, so we purchased a Laptop plastic tray that raises the rear end and also since the fan is on the right rear we moved the Laptop off centered to allow the fan to flow better. I also just recently installed a new 500Gb HDD to replace the orginial installed 160GB and during the process the sucker got even hotter, so I left off the plastic plate that covers the HDD and the fan for air flow, after using EASEUS Partition Master 9.0.0 Home Edition to move everything to the newer drive I found that the newer 500Gb HDD when installed in the Laptop, a WD product, ran cooler.
Hope this helps, I know its not PLCOS conversation, sorry.