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[GH-ISSUE #10458] Qwen3 MoE 30b-a3b, poor performance and Low GPU utilization issue #68935
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opened 2026-05-04 15:55:40 -05:00 by GiteaMirror
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Reference: github-starred/ollama#68935
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Originally created by @vYLQs6 on GitHub (Apr 29, 2025).
Original GitHub issue: https://github.com/ollama/ollama/issues/10458
What is the issue?
When running Qwen3-30b-a3b, my 4090 is only running at ~120w, really low utilization and slow speed for a 3B active MoE
AMD 7950x3d, RTX 4090 24gb, 64gb RAM, windows 11
Test results down below:
All default ollama settings.
set OLLAMA_DEBUG=1 && ollama serveollama run qwen3:30b-a3b-q4_K_M --verboseRelevant log output
OS
Windows
GPU
Nvidia
CPU
AMD
Ollama version
0.6.6
@lwh9346 commented on GitHub (Apr 29, 2025):
Same issue on RTX 5090.
@vYLQs6 commented on GitHub (Apr 29, 2025):
For comparison, I'm getting
138.52 tok/secwhen using lmstudio, same prompt & Q4 modelSince both project are based on llama.cpp, I guess there is some bugs in ollama
@INDEX108 commented on GitHub (Apr 29, 2025):
same issue with Qwen3:32b ,poor performance on 2x4090
@bitcandy commented on GitHub (Apr 29, 2025):
same, poor GPU memory utilization issue, but this is not only related to Qwen3:32b, but to other models... It's utilize only 1/2 or 2/3 memory of some GPUs
@merc4derp commented on GitHub (Apr 29, 2025):
It's significantly slower in gpu mode on my 5070ti than on the 3700x in cpu mode. Completely broken atm.
@dpk-it commented on GitHub (Apr 29, 2025):
same issue with 5090
@jfgonsalves commented on GitHub (Apr 29, 2025):
Yes I'm also seeing this behavior. Using Linux with 2x3090.
@tripleS-Dev commented on GitHub (Apr 29, 2025):
Im also around 120w in 5090, but Lm studio is very fast
@Blueman2 commented on GitHub (Apr 29, 2025):
Yep, same issue here on windows with a 5090
@hsz1273327 commented on GitHub (Apr 30, 2025):
same, run in 8700g in ubuntu, poor performance on 780m(9~10t/s) event lower than pure cpu(16t/s)
@bigZos commented on GitHub (Apr 30, 2025):
same issue here with 5090
@MX-Goliath commented on GitHub (May 1, 2025):
Same issue using single 7900 xtx or 7900 xtx + 6950xt. On CPU working just fine
@StailGot commented on GitHub (May 1, 2025):
7900xtx ollama ~33 t/s, llama.cpp rocm ~117t/s
@Lawlietr commented on GitHub (May 2, 2025):
I use 30b-a3b with 3950x + 128GB and rtx 3080 10GB, it only take 7.x tok/sec.
But in my pc2 4650G + 28GB( apu taken 4GB ), got 15.99 tok/sec.
It's really weird.
@kshabanaa commented on GitHub (May 2, 2025):
same issue with an rtx 3090, ollama team pls try to fix it
@cwiggi01 commented on GitHub (May 2, 2025):
Same issue.
@dominae commented on GitHub (May 2, 2025):
Same issues on Debian with AMD Instinct MI60 and on another Debian box with Nvidia A4000
@jmorganca commented on GitHub (May 4, 2025):
Hi all, sorry about the performance issue. It will be fixed in 0.6.8: https://github.com/ollama/ollama/releases/tag/v0.6.8-rc0 a pre-release is ready if you'd like to try it
@kargaranamir commented on GitHub (May 4, 2025):
Hi @jmorganca, Can you point out what the issue was and in which commit or pull request it was solved?
@VideoFX commented on GitHub (May 4, 2025):
only 5-13 t/s here.
v0.6.8-rc0
A4000 (15GB vram)
Ryzen 9 3650x, 64GB DDR4
2048 context length
OLLAMA_NUM_PARALLEL=1
Very slow going. Maybe not enough vram for any more speed?
@Lawlietr commented on GitHub (May 5, 2025):
In my case 0.6.8 in the 4650G pure CPU it's still fast then 3950x + rtx 3080.
Almost achieved a two-fold performance gap
@TungstenWolframite commented on GitHub (May 7, 2025):
Thank you for fixing this issue!
My speeds were slower than LM Studio prior to the fix.
Now it's 3x faster LM Studio :)
@chrisoutwright commented on GitHub (Jun 8, 2025):
same issue with 0.9.0
qwen3:30b-a3b-q4_K_M
about 30-40 t/sec
about 170w on 4090 and 70w on 3090
@maglat commented on GitHub (Aug 7, 2025):
Watching nvidia-smi during the processing, the latest qwen3-30B-a3b just utilize 350W of 550W on my RTX 5090. processing feels slow.
@lukasz-secret-account commented on GitHub (Aug 17, 2025):
Yeah the issue is still alive.
@gengyuchao commented on GitHub (Aug 21, 2025):
Ollama version 0.11.3 has the same issue on RTX 5090.
@maxi1134 commented on GitHub (Oct 12, 2025):
Problem still present in October
Nvidia-SMI does not report anything over 80% usage when running Qwen3 MoE 30b-a3b, but I get to 100% usage when running Qwen 3 4b Q4KM
@YazanGhafir commented on GitHub (Oct 20, 2025):
Same issue on Nvidia A16 cluster and latest Ollama 0.12.6.
@SurealCereal commented on GitHub (Oct 20, 2025):
I am seeing this problem with Ollama 0.12.6 on Docker/Linux, running Qwen3-30B-A3B-Instruct-2507 (Q4_K_M and Q4_K_XL), on an RTX PRO 6000 Server card. Typically it hits max 20% GPU utilization. Similar problem with GPT OSS 120B which reaches 25% GPU utilization. I tried with the following settings:
@emzaedu commented on GitHub (Oct 30, 2025):
Same problem with Ollama 0.12.7 on Windows 11. RTX 5090 max 40-44%. with Qwen3-30B-A3B-Instruct-2507 / Qwen3-VL-30B-A3B-Instruct

@SurealCereal commented on GitHub (Nov 10, 2025):
I am seeing this in 0.12.10. At first
qwen3-vl:30bwas working properly, using close to 100% of the RTX PRO 6000 GPU.Two actions consistently make it slow: Switching to other models and running several queries one after another; eventually it breaks and gets slow. Also waiting many hours seems to do it. Same problem with GPT-OSS 120B.
The models end up being able to use 10-25% of the GPU, hovering around 15-20% mostly. I tried restarting the Ollama container and also re-creating the container but observed no change. Its like something breaks in the docker engine, CUDA or driver. Restarting the Docker service fixes it.