I need help with FPS drops

[Subzerus]

Recently I have bought a new computer with:
MSI twin frozr GTX 770
AMD FX 8350 eightcore 4.0 Ghz
16 GB of RAM DDR3 CL9
And windows 7 ultimate
I have an SSD with windows and a HDD with the other stuff

I've been playing skyrim on ultra, planetside 2 on ultra and watch dogs on high just to test my PC and when I have been playing for a while random FPS drops start happening even with the grafic settings on minimum. Goes from 19 FPS for skyrim, 14 for planetside and 0-5 for watchdogs.
Please I need help, I have the latest nvidia drivers and the latest APU drivers for AMD and I know I shouldn't get random FPS drops with this PC, so I need help, please! (Yes I have a good cooler too if you thought that was it, it's not)

 

[Suztera]

You don't need AMD drivers. You don't have an APU. I would advise you to uninstall every graphic drivers and reinstall the Nvidia only.

 

[Subzerus]

You don't need AMD drivers. You don't have an APU. I would advise you to uninstall every graphic drivers and reinstall the Nvidia only.

Done that, didn't change anything at all though...