Performance tanked after installing (?) 4090!

User Support Hub Install, Performance & Graphics
,
1

I tried to swap my 6900 xt for a 4090. Some results: Kombuster scores: 6900XT > 3724, 62 FPS. 4090 > 897, 14 FPS. Worst of all, MSFS went from approximately 40 FPS TO 5-10 FPS. One other weird thing: system won’t fully boot unless the HDMI port to monitor is active in addition to DP. These and other abnormalities have me completely flummoxed. I don’t know if the GPU is bad or there was an installation problem or some “switch” in Windows is in the wrong position. And I don’t know how to find out. I contacted the seller trying to get technical support but have heard no response yet . Any ideas appreciated.

Oh, and note these confusing User Benchmarks below.

WITH 6900:
UserBenchmarks: Game 215%, Desk 113%, Work 213%
CPU: AMD Ryzen 7 5800X3D - 111.3%
GPU: AMD RX 6900-XT - 197.2%
SSD: WD Black SN750 NVMe PCIe M.2 1TB (2019) - 317.1%
SSD: Adata SU760 512GB - 109.4%
RAM: G.SKILL F4 DDR4 3600 C16 4x8GB - 128%
MBD: Gigabyte GA-B550 AORUS ELITE

FIRST RUN WITH 4090:
UserBenchmarks: Game 341%, Desk 111%, Work 330%
CPU: AMD Ryzen 7 5800X3D - 110.7%
GPU: Nvidia RTX 4090 - 320.5% ALTHOUGH THIS SCORE LOOKS GOOD, IT’S IN THE BOTTOM 10% FOR 4090’S
SSD: WD Black SN750 NVMe PCIe M.2 1TB (2019) - 308%
SSD: Adata SU760 512GB - 110.2%
RAM: G.SKILL F4 DDR4 3600 C16 4x8GB - 125.9%
MBD: Gigabyte GA-B550 AORUS ELITE

2

You must clear your shader cache if changing graphics cards / drivers.

Also you may need to delete and recreate your rolling cache. Otherwise your test is void.

3
  1. Check power supply and connections to gpu. With my 3090, I connected the power cables incorrectly and was dismayed at the poor performance. Once I figured that out using HWiNFO64 (the power draw was waaaaay low under heavy load) and re-cabled it, everything worked great.
  2. Do a complete deletion of all gpu drivers using DDU and do a clean reinstall of the Nvidia drivers only.
4

Thanks for your suggestion. I haven’t responded because my PC was in the shop and I just got it back. I take these are MAFS components? Any suggestions re how to do this appreciation iated.

5

I’m not sure if AMD have a tool to cleanly remove all of their drivers and bloat. But you’d need to do this first. (and reboot)

The shader cache is a Windows area…

The rolling cache is in MSFS….

You then need to create the rolling cache again. Mine is set at 16Gb

Next install the nvidia driver (personslly I avoid Gefirce experience as its jus badly written bloatware)

On my set up I change nothing in the driver and adjust the settings in the sim (remember you’ll need to restart the sim for a lot of settings to take effect)

Good luck