Question Stuttering in games (unsolved)

[Kapiszon]

Hi!
I have stuttering problems with my PC. I thought it was because of my previous monitor, so I've changed it to Samsung Odyssey G5 (1440p, 165Hz, G-Sync Compatible).
But the issue still remains.
Games with major problems:
CS:GO - stuttering (frame drops and var rise), I have 250-300+ fps, but frametime is spiky, sometimes it's unplayable.
Fortnite - totally unplayable, I'm not able to get more than 50-60 fps even on the lowest resolution scaling and settings. Changing to highest settings don't help. Stuttering is terrible.
BFV - same situation as Fortnite.
Games with minor problems:
Valorant/Paladins/Phasmophobia - playable, but stuttering every 20-30 seconds.
Games without problems:
Monster Hunter Rise/Rocket League - these games are working fine without any problems.

I tried a lot of benchmarks, and my score was always in a high percentile.
My friend's PC have the same problems with games like CS:GO or Fortnite.
Specs:

• i9-9900KF
• Corsair Vengeance 16 GB DDR4 3000MHz CL15 (2x8) (in dual-channel and XMP ON)
• RTX 2070 Super Ventus OC
• Samsung 970 Evo 500 GB (system) + Adata SU650 512 GB
• PSU Be quiet! Straight Power 11 650W Plus Gold
• Asus TUF Z390M Pro gaming (motherboard)

What I tried (didn't help):

• default BIOS settings
• Disabling Game Bar
• Disabling Overlays
• system restore
• a lot of Youtube videos about PC optimization (power plan, autostart, debloating etc.)
• Turning off/on G-Sync
• changing settings in Nvidia Control Panel
• older GPU drivers (I have the latest)
• tested temperatures (they're fine)
• tested usage (CPU never hits even a 50%)
• I tried my friend's RAM
• Changed CPU from i5-9600K to i9-9900K (both had these problems)
• Videos with "magic" fixes like registry changing and ram cache cleaning schedule
• In game V-Sync settings and capping frames in value lower by 4 fps
• Running latencymon (values of latency were low)

I really don't know what do to, so I'm open if anybody knows.

 

[Lutfij]

Welcome to the forums, newcomer!

Asus TUF Z390M Pro gaming
What BIOS version are you on for your motherboard?

Be quiet! Straight Power 11 650W Plus Gold
How old is the PSU in your build?

Samsung 970 Evo 500 GB (system) + Adata SU650 512 GB
Which drive are the afflicted games installed on? If they're on the Adata drive, install the game on the Samsung drive. Speaking of SSD's, use Samsung's Magician app to see if your Samsung SSD is pending any firmware updates. Likewise do the same for your Adata drive using SSDToolBox.

older GPU drivers (I have the latest)
Did you use DDU everytime you needed to remove your GPU drivers?

 

[Kapiszon]

Welcome to the forums, newcomer!

Asus TUF Z390M Pro gaming
What BIOS version are you on for your motherboard?
BIOS version is 3006, it's currently the latest one.
Be quiet! Straight Power 11 650W Plus Gold
How old is the PSU in your build?
PSU has 4 years
Samsung 970 Evo 500 GB (system) + Adata SU650 512 GB
Which drive are the afflicted games installed on? If they're on the Adata drive, install the game on the Samsung drive. Speaking of SSD's, use Samsung's Magician app to see if your Samsung SSD is pending any firmware updates. Likewise do the same for your Adata drive using SSDToolBox.
Mostly Samsung Evo, but some are on
older GPU drivers (I have the latest)
Did you use DDU everytime you needed to remove your GPU drivers?

BIOS version is 3006, it's currently the latest one.

PSU has 4 years.

Mostly Samsung Evo, but some games are on the Adata.

I do.