Prime 95 is not the app to be running on your pc. We already know it's too hot. Prime 95 will stress the system more than regular gaming, hence it will get hotter. No need to do it, don't go there. All you might succeed in doing is heating up so much the system shuts down. Great discovery.
If you were to follow my suggestions, something would change. Switching off 4 cores in the bios will reduce the cpu temperature. But it won't particularly impact gaming performance on a game that only uses 2 cores and 2 threads. You will have 4 cores available, 2 for windows and 2 for the game.
Nothing more can be done. This effort is only to try to reduce temps without spending any money. The mobo is too limited for overclocking, not that it would do much anyway, & the odds are that your psu isn't suited to overclocking either.
8gb of ram is also quite limited that means windows will have to page out to the slow hdd which is another system bottleneck. Freeing up some resources with a windows tuneup to reduce background processes will mean it has to page out to the hdd less.
None of it may be enough to boost the system to reach 60fps on far cry 4. You should be able to play at a lower resolution of say, 1024x1048 or 1024x768, all sub hd and not very pretty, but short of spending on upgrades there isn't anything else to be done.
You felt it should be able to run far cry 4 but it could much be the case that the system doesn't feel like it. You are already running into thermal trouble running an octa core cpu on a board not suited f'rit. Far Cry 3 by the way, is pretty heavy for an fx, so 4 with an upgraded engine and more effects, is probably actually heavier.
The line should be drawn there really. You can try a tune up and get your system doing the best it can and that will simply inform you of the need to improve it if you want to run titles like far cry 4.
User benchmark will give a clearer picture of what's going on than Prime 95. Fyi, an entry level ryzen will exceed the performance of an overclocked fx, by a significant amount, without even being overclocked. Here's a list of the
cpu-z bench scores for some common cpus.
No need to buy a 6300 cpu. Just switch off 2 cores in the bios, of your existing CPU, and it will in effect be a 6300. Switching off 4 cores will really flatten your temps. That's the only free way to do it you have available right now.
The sole purpose of switching off some of the cores is to see if removing the thermal throttling will help the frame rates any. That's all.
*I would argue that first tuning up your pc is a necessary step before deciding whether to upgrade the core (cpu ram &mobo) or the gpu.
*Before upgrading gpu you still need to address the thermal throttling of the octa core cpu on the board that isn't suited f'rit, by turning off some of the cores in the bios.
*Upgrading to an ssd will improve system performance.
*Upgrading your cpu, mem, board, gpu and hdd to an ssd together, will run a wider variety of games without any nonsense.
*You're current build is overall quite weak. Obviously if you want more then you'll have to buy more. You should be able to find something to numb your mind from the pain.