Just bought an AMD Phenom II X4 965 cpu and mounted it on Gigabyte GA-970A-DS3 but the cpu overheats at 50-55°C idle (cpu cooler is stock).
So far i tried: re-mounting cooler(new thermal paste), setting cpu voltage to stock values or lower, getting bios settings to default, bios update.....none of these got any major improvement so i was thinking to buy a good cpu cooler but im not sure if that will drop my temperature by 15-20°C. I also have no rear fan so planning to buy one 120mm too. Waiting for fast replies
The first thing is definitely a case fan. If you don't have the air leaving the case, eventually you're just blowing the same hot air back over the processor. At 125w, the Phenom 965 isn't a processor that was ever meant for minimal cooling situations. There are also many, many better solutions than the stock cooler. Almost any respectable cooler will lower temps -10c from stock, assuming of course there is some airflow through the case. The Xigmatek Gaia is a good 120mm cooler I use, and the Xigmatek Loki is a good 92mm cooler for tighter fit cases. If you want to use the stock clips for the cooler instead of installing it with screws and a new backplate, the Deepcool/Logisys Gammaxx 300 (MC3002GX) is a solid choice as well.
I had the exact same problem with my 965 about a year ago. Even with an OCZ Vanquisher I couldn't keep temps under control, but I bought an Antec kuhler box heat sink, now I'm idling in the low 30s, and topping out at mid 40s. Couldn't be happier.