Fx 8150

Depends on room temp. and case temp.

Idle temp of of 40c isn't bad. Load temps are what matters.

65c on load

Are you overclocked? 65c is average.

no only on stock cooler

Temps aren't that bad, but with an aftermarket cooler, you'll be able to overclock and stay at your current temps.

i mean can make it more cooler and silent my fan with stock cooler

You can try lock down voltages a bit, running the lowest voltage needed at stock clocks. That may help lower it a bit but unfortunately the stock cooler is only enough, not spectacular.