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Unfortunately I cheaped out on the motherboard (MSI Z390 Gaming Edge AC, midrange board) 6 years ago when buying the machine, so anything more than 5 GHz is off the table, and even that crashes under heavy load. 4.9 @ 1.295 is my rock-stable overclock/undervolt, and I can't really change that. Good temps under load, though.@X90
Try to test with and without HT.
Overclock your i9-9900k to 5ghz and check temperatures during racing, my i9-9900KS is at 5,2Ghz and have lowered the Voltage .
Use software to divide CPU core for AC only/other processes, affinity/pior/forced shutdown. Process Lasso or Bill2 .
Guess you are on the CSP 2.8, maybe the whole version is crapy.
Try to get the knowledge what every adjustment is doing and not clearly see an improvement then lower/shutdown. Better to go hunting for the real ones as you need every droplet for a constant Frametime.
Some mods introduce strange fluctuations, mostly this behavior can be found in tracks/cars that are converted from other old racegames. Also some additional mods/apps can be interfering with CPU frame times.
Disable your Virusscan (as a test).
All those advices from guys that are using a super duper AMD9800X3D/RTX5090 are not helpful, read the advices from guys who are using low end systems.
Use the OSD tool from CM it give a lot of info on frame time behavior.
Here below a copy/paste from my old post here, old and more Vcard related, but still valid.
Here is my tip on this what’s the best adjustment, because there are so many different hardware it’s for everyone different. My adjustments on a old rig with VR, needs a complete different adjustment then a highend rig & 27” 4k monitor user. Then there is also your personal taste like achieving a stable FPS or in my case get rid of shimmering I do hate.
Read this: tweakguides and lots of info on the guru3D forums guru3D further from my favorites map at: https://stepmodifications.org/wiki/Guide:NVIDIA_Inspector
https://www.pcgamingwiki.com/wiki/Nvidia_Profile_Inspector
I know its about Nividia profile inspector but it’s also contain lots of general info. Because I still think you have to know what you are doing, what the effects are from all those adjustments and is it worth.
Determine what you dislike, as I hate graphical artifacts like shimmer and jaggies. So with the info I have, I’m trying all the specific adjustments on that aspects and see what the effects are.
My test object is btw your (=Racingjoe) ) improved SPA’66 and the Aston Martin Ulster (ACTK site).
I only doing a static test in the pit not a test drive. While in cockpit view I can see all kind of graphical defects that become better/worser, near and at the distance. The AM Ulster is btw a very good car to test as its louvres and front windshield frame are very prone to jaggies.
After finishing that I’m doing a race to check FPS using the CM statistics app.
If being satisfied store your CM pre-selection (video and CSP) settings and make printscreens of your Nvidia settings.
One important thing, if not seeing any improvements from a certain setting I disable this, why using if it only cost you precious FPS. So concentrate on the clear to see improvements setting and skip those maybe setting.
As being a non English speaking person it’s maybe a bit fuzzy writing, sorry for this.
I won't make that mistake next time. But unfortunately any tweaks to the hardware itself is impossible.
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