I wonder if the cpu fan is strong enough or if I need a better one?
Will I be able to increase from 3,4 to around 3,8 ghz?
cpu is 32 idle. and around 45-50 during gaming. I have heard amd 965 max operating temp is 60?
cpu fan is automatically running at around 1200rmp
You can try 3.6GHz, at stock voltage usually work. About your temps, I'd not go above 60ºC. If you want more speed, maybe you need a better cooler.
I'm certain you can get 3.8 GHz with your CPU. I have a 945 and I OC'ed it to 3.9 from 3.0. As saint mentioned, you may need a better cooler. I'm using a Titan Fenrir cpu cooler. www.frozencpu.com has some decent pricing with loads of inventory.