Is this Thermal Throttling? New to Stress Testing

[Blackapino]

I just installed a New GPU a installed it a few weeks ago. I'm Trying to understand what Thermal Throttling is as I've never Do a Stress Test Before and still Learning even though this is my Second Build, But I'm Trying too understand all of this and I'm asking because a few nights ago while Playing COD my PC just Shut down. So I let it sit for a Bit and then rebooted and then played some COD again, it seemed to be playing fine after that so I didn't give it a second thought, then it happened again Yesterday twice, I did some Digging and it seems there are 3 likely issues and How to Solve them. 1. Possible overheating .2 Bad PSU and 3. Bad Ram. So around 3-4am I took my AIO apart to wipe off the Thermal Paste as I didn't do this when I installed the Ryzen 7 only did it on the CPU, I wiped off ALL thermal Paste both CPU and AIO installed it back together again tried some COD again for about 15mins and it seems Fine, so I tried CINEBENCH for the first time to see if I could understand these random shut offs. This is the result of that Test, so I'm wanting to understand is this a normal reading or is there something I need to change? more Air Flow? better thermal Paste? Just Want to understand so then if this happens again I'll Have a Bit more knowledge to Go on. So IS this Thermal throttling?

My Built
CPU: AMD Ryzen 7 7700X 4.5 GHz 8-Core Processor
CPU Cooler: Corsair iCUE H115i RGB Pro XT 63 CFM Liquid CPU Cooler
Motherboard: Asus ROG STRIX B650-A GAMING WIFI ATX AM5 Motherboard
Memory: G.Skill Ripjaws S5 32 GB (2 x 16 GB) DDR5-6000 CL30 Memory
Storage: Samsung 870 Evo 1 TB 2.5" Solid State Drive
Video Card: XFX Speedster MERC 310 Radeon RX 7900 XT 20 GB Video Card
Case: Corsair 4000D Airflow ATX Mid Tower Case
Power Supply: Segotep GP700G 700 W 80+ Gold Certified ATX Power Supply
Operating System: Microsoft Windows 10 Home OEM - DVD 64-bit

 

[Martin]

Those temperatures are too high for such a cooler and result in thermal throttling.
So either improperly applied thermal paste, cooler retention or air flow problem.

 

[Blackapino]

Those temperatures are too high for such a cooler and result in thermal throttling.
So either improperly applied thermal paste, cooler retention or air flow problem.

I reapplied the thermal Paste so I'm goin too look at my Fans but Not sure what you mean by Cooler Retention

 

[Zach]

I reapplied the thermal Paste so I'm goin too look at my Fans but Not sure what you mean by Cooler Retention

There can be a lot going wrong for such a temperature.
Ryzen 7000series have max operating temp at 90C. You should stop stressing your PC until you find what's going on or you might damage your CPU permanently.

@Martin means the block mount retention mechanism on the CPU socket. You might not install it correctly. Something might be loose.
Check also your fan speed and pump speed.
Your AIO should be able to handle with ease 150W of heat and keep the CPU under 90C.

Temporarily you can go into BIOS and set max CPU temperature at 80~85C until you find what's going on. With a temp limit from BIOS, the CPU will regulate its clocks and voltage in such way so it never passes the selected temp. You might loose some boost, but it will be until you find the solution.