Hi everyone!
I'm having a serious issue after recently upgrading my GPU from an RTX 3050 to an RTX 5060. I suspect my CPU might be bottlenecking the GPU, but I'd like to get a proper diagnosis before buying a new processor.
My PC specs
- GPU: Gigabyte GeForce RTX 5060 WINDFORCE MAX OC 8G
- CPU: AMD Ryzen 5 4500 (6 cores / 12 threads)
- Motherboard: ASUS Prime A520M-K
- RAM: 32 GB DDR4-3200 MHz, dual-channel
- Storage: HP EX900 Plus 1 TB NVMe M.2 SSD
- PSU: UNYKAch Courage 750 W, non-modular
- Case: UNYKAch Courage (exact model unconfirmed)
- OS: Windows 11 26H2
The problem
In many games, I experience frequent FPS drops. For example, the game runs at 60 FPS, drops to around 52–58 FPS for a moment, and then immediately returns to 60.
I cap my FPS at 60 because my display is 60 Hz, and I'm happy with that. I've also tested without an FPS cap and with V-Sync disabled. The same drops still happen: for example, going from 130 to 110 FPS at the same moments when the capped FPS drops occur.
What I've already tried
- Reinstalling GPU drivers using DDU.
- Downgrading to an older NVIDIA driver to rule out a driver issue.
- Letting games finish shader compilation.
- Changing NVIDIA shader cache settings.
- Updating the chipset drivers.
- Testing different resolutions and graphics settings.
None of these has solved the problem.
Why I suspect a CPU bottleneck
- Similar performance at different resolutions and graphics settings
In many games, I get almost the same FPS at 1080p and 1440p, and changing from low to ultra settings often makes little difference, unless the GPU reaches 100% utilization.
- Cyberpunk 2077 performance
In Cyberpunk 2077, I get approximately:
- 70 FPS while standing still.
- 60 FPS while moving the camera.
- 53 FPS while walking around.
Crowd density also has a significant impact: I get around 35 FPS with high crowd density and around 50 FPS with low crowd density.
During these tests, CPU utilization is roughly 70%, while GPU utilization is often 40% or lower.
Also, a wierd thing is that in the in-game built simulation says I should be getting 90 fps.
- Uneven CPU thread utilization
In CPU-demanding games, I've noticed that one CPU thread is often much more heavily utilized than the others. This sometimes coincides with FPS drops while GPU utilization remains relatively low.
I understand that overall CPU utilization can be misleading because a game may be limited by one or a few threads without using all the CPU's resources.
My question
Does this sound like a CPU bottleneck caused by the Ryzen 5 4500, or could something else explain these recurring FPS drops?
I'm considering upgrading to a Ryzen 5 5600, but I don't want to spend money on a new CPU if the problem is actually caused by something else.
What would you recommend checking to identify the actual cause? I'd especially appreciate advice on distinguishing a CPU bottleneck from frame-time issues, background processes, or other possible causes.
Thanks in advance!