My stock Core 2 Duo E6700 runs at about 55 degrees Celsius when idle using a crappy coolermaster. I haven't ran any games on it yet, but I plan to. Also, I'm using an Antec 300 case, so is that temperature fine, or is it too hot, and I should get a new fan.
you are asking how to improve chill of the cpu get good airflow case i would get thermaltake element s or g then get thermaltake frio but first check the cpu cooler compatibilty with your motherboard socket i think your mobo socket is LGA 775 or you can check cooler master v8 cooler
Run the games. Check the temps. Then decide what you want to do.
yeah exactly dont run games download everyst system stability check start the benchmark for 5 minutes and check how far your cpu temps will reach if it doesnt reach danger level then your set because this software will load your cores 100% this is the perfect way to check your cpu load and temps but really 55 C is high temp my stock i7 cooler runs my cpu cores to 37-41 C idle and im from kuwait very hot weather country just like i told you earlier get good airflow case and new heat sink fan and good thermal paste then your set
if you needed any further help you can contact me by private messaging