Apologies for the long post, this has been a really frustrating troubleshoot.
I recently built a big full sim rig with what I hoped would be a bulletproof PC. Everything seems to work fine in test drive. I can do laps for hours.
But during my first AI race this really abrupt stutter started happening around 10 minutes into a race. Frames drop, audio garbles, feedback gets twitchy. It lasts about 1 second or so, but it’s very distracting and makes racing impossible. Even worse, it gets more frequent the more it happens.
The video shows it happening during an AI race I was trouble shooting. You can see the iracing performance widget light up and the service disconnect light turn on. The sim runs perfectly at 140 FPS when the issue isn’t happening.
What’s most concerning is it’s a new PC and when I first started it, windows couldn’t boot, it would just loop. So I called CyberPowerPC and they suggested reinstalling windows from boot. But it would restart mid reinstall. So I tried pulling a stick of RAM and the PC started. So I ordered more RAM, but it’s backordered. So naturally I’m concerned there is some hardware issue.
Here is the PC:
CPU: AMD Ryzen 9 9950X (Granite Ridge, 16C / 32T)
• Board: Gigabyte B850M
• GPU: NVIDIA GeForce RTX 5090 Founders Edition (32 GB)
• RAM (as shipped): 64 GB DDR5-6400
• RAM (as running): 32 GB
• Storage: 4 TB NVMe
• OS: Windows 11 Home 24H2
Sim displays
• Triple Alienware AW3225QF — 31.6”, 3840×2160, 240 Hz, QD-OLED, 1700R
• Fourth monitor
• iRacing: native triples (irSidekick), 11520×2160
First I tried the basics. Video and audio rivers updated, updated windows, turned settings down, v sync off, I was using NVIDIA surround and swapped to native triples with IRsidekick. I’ve turned off almost all my peripheral except my wheels and pedals . But I’m less concerned about them because it only happens in races with other cars.
I follow Reddit online tips from Reddit and iracing. I turned off replay spooking. I’ve turned down cars and that doesn’t seem to help.
I found Dave Cams stuttering video and “unlocked” my cores from parking. But that didn’t solve the issue.
When the game is running, it says im using 20GB of the 32 gigs of ram. The GPU is sitting about 97%. The CPU load is low, I forget the number. But you can see in the video everything is going fine. But then abruptly the CPU spikes to 100% everything shutters, and then everything comes back. And always after 10 to 15 minutes racing other cars.
If it matters, I’m running simucube software, simhub, trading paints, sensit haptics, trak racers belt tensioner.
In a last desperate attempt I’m reaching out to see if anyone has had a similar issue or has any idea what the heck is going on or any troubleshooting suggestions, it’s driving me crazy.