My Gpu won't run on my games until I alt+tab

[Piepi]

So I just built this new system off of items from PCpartpicker. It is my first time building or even using a pc so I had some trouble at first but finally got it running. Whenever I go to launch a game the FPS counter is always above 150 frames, but after 3-5 minutes my gpu stops using its power on the game, and starts forcing the load onto my cpu giving me consistent 70-80 FPS but it is extremely choppy, however, when the game is in windowed mode and I alt tab it quickly jumps up to normal FPS and my gpu begins running the game again according to task manager. I have uninstalled GeForce experience, turned off Xbox overlays, disabled G-sync(In Nvidia control panel), Changed optimization and prioritized my games in graphics settings,and reinstalled my drivers multiple times. Nothing I have tried so far has helped. I don't know if its worth mentioning, but I also have a, from what I've gathered, "faulty" stick of ram that is hardware reserved in my system. None of my games require more than a gigabyte worth of ram so I don't know if it's something to worry about. 

Here are the Items I bought: https://pcpartpicker.com/list/QTZgD2

 

 

[Turtle Rig]

35 minutes ago, Piepi said:

So I just built this new system off of items from PCpartpicker. It is my first time building or even using a pc so I had some trouble at first but finally got it running. Whenever I go to launch a game the FPS counter is always above 150 frames, but after 3-5 minutes my gpu stops using its power on the game, and starts forcing the load onto my cpu giving me consistent 70-80 FPS but it is extremely choppy, however, when the game is in windowed mode and I alt tab it quickly jumps up to normal FPS and my gpu begins running the game again according to task manager. I have uninstalled GeForce experience, turned off Xbox overlays, disabled G-sync(In Nvidia control panel), Changed optimization and prioritized my games in graphics settings,and reinstalled my drivers multiple times. Nothing I have tried so far has helped. I don't know if its worth mentioning, but I also have a, from what I've gathered, "faulty" stick of ram that is hardware reserved in my system. None of my games require more than a gigabyte worth of ram so I don't know if it's something to worry about. 

Here are the Items I bought: https://pcpartpicker.com/list/QTZgD2

 

 

Well firstly 47c on idle is a tad bit too much.  Also 8GB is pretty much a bottleneck as you cant have a huge cache that extra 8GB stick would help thing.  As for alt tabbing for game to work is fishy.  I would just run a DDU on it in safe mode and clean and restart and back into normal mode install the latest WHQL drivers that just came out.  Then let us know what happens.

[Piepi]

I just got 16 gigabytes of ddr4 3000 MHZ corsair lpx ram and I still have the same issue where my gpu will only work when I tab out of the game. I have ran ddu before and nothing changed, I also previously did a complete wipe of my system to make sure I didn't install the default windows graphics drivers. This is what it looks like via task manager in the images down below, the fps meter is on the right of the image. I followed your instructions and it still isn't working, got any other ideas?