They both have PCIe 16x graphic card slots- however, the G41 has a PCIe 2.0 slot. The 8GB RAM advantage of the G41 is effectively made moot by the high expense of 4GB DDR2 sticks. The G31 board has the disadvantage of a non-compatible (for OSX) LAN controller. They switched the chip from Realtek to ...

K10Stat is a utility that lets you change voltage settings at different P-states. The Turion II M500 has five of them, and is more undervolt-able than previous, mobile dual-core K8 processors. K10Stat works great at changing voltages, and I've confirmed with CPU-Z that it does work. Haven't done tem...

If you wanted you could do your original idea but turn both fans around and make the back exhaust an intake then build a little duct on the right side of the heatsink leading to the top fan.