Re: Acer 8940g 250m GTS downclocking:
That sucks. Be patient and someone should be able to help you. Personally, mobile GPUs are hit and miss for me. Some work great, some do not. My old Mobile ATi 9800Pro was a miracle worker.
Just a suggestion: have you tried lowering details/special effects, and seeing if it runs better? also, have you tried running the games with the laptop actually plugged into the wall?