Draguni :
I have Cooler Master Silencio 550 ATX. I haven't bought any extra fans. Only fans I have are the ones in the case (one on the front, one on the bottom and one on the back)
Well your CPU temps aren't going to drop much because you're using the stock fan. The fans on 970 don't direct heat out the back but in the case itself. That means you'll want good air flow from the front to the back of the case. The fan on the bottom doesn't count. It's the fan for the PSU which should be facing down to draw in air and exhaust out the back.
Options:
1. Clean out the dust filter in the front of the case and possible add another 120 mm fan for intake.
2. Install a new aftermarket CPU cooler if those temps are bothering.
If all else fails, a new better airflow case. But I don't think that's necessary. Again, your temps are a little warm but not terrible.