pc help please

[nihjola]

almost every new game i try and download either it wont run or lags and stutters constantly. games like fortnite, overwatch2, rumbleverse, sackboy big adventure. and many many more.
ive tried everything under the sun to fix it mind you this rig is only a month and a half old custom built it from microcenter. (which they basically said nothings wrong with pc cause they all have no clue what they doing over as far as troubleshooting) ive tried so many things xmp enabled, nothings in power saving mode, disabled all overlay things like gamebar and geforce, tried a fresh DDU, all drivers up to date. some games do work (not many but some) which is why this is very strange and literally no one has been able to figure it out. ive also tried different monitors and resolutions still nothing

my pc specs:

• i7-12700k alder lake 3,6ghz
• z690 plus tuf gaming motherboard
• vengeance rgb pro sl 32gb (2 sticks) ram
• rtx 3080 10gb
• lian li galahad 360mm rgb water cooler
• samsung pro ssd 2tb m.2 drive
• corsair 1000 watt 80 plug gold atx
  
  
  
  these are my temps from what i am told by a pc friend of mine temp 5 is a broken sensor because it literally jumps from 0c to 115c to 20c literally every few seconds plus nothing feels hot/warm in the computer
  these are my temps
  gyazo .com/e7ccfbc88fe0c77362810169345839e2
  
  ubm results:
  UserBenchmarks: Game 247%, Desk 117%, Work 271%CPU: Intel Core i7-12700K - 117.9%
  GPU: Nvidia RTX 3080 - 214.7%
  SSD: Samsung 980 Pro NVMe PCIe M.2 2TB - 481.1%
  RAM: Corsair CMH32GX4M2D3600C18 2x16GB - 107.3%
  MBD: Asus TUF GAMING Z690-PLUS WIFI D4