Qwen 3 30B A3B needs ~18.9 GB VRAM. RX 7800 XT 16GB has 16.0 GB. With Q3_K_S quantization, expect ~36 tok/s.
Operating mode
Interactive favors responsiveness, while light API and scale-out lean harder on serving readiness. The fit stays the same, but the recommendation lens changes.
Current mode
Balanced
Balanced for general local use. Keeps the ranking neutral across personal and serving workflows.
Select quantization to explore
6.6 GB over capacity — needs offload or smaller quantization
Fit status
Too heavy
Decode
21.3 tok/s
TTFT
9103 ms
Safe context
4K
Memory
22.6 GB / 16.0 GB
Offload
30%
It fits through host-memory offload, and offload is the main reason performance drops.
CPU or host-memory offload is active
About 20% of the working set spills out of accelerator memory, which usually hurts latency and sustained decode throughput.
Very little memory headroom
You can run the model, but there is not much room left for longer context, bigger batches, extra apps, or future model updates.
Remove offload with more accelerator memory
Prioritize a GPU or unified-memory tier that fits the whole model natively. Removing offload usually helps more than small compute gains.
Buy headroom, not only minimum fit
A slightly larger memory tier gives you safer context growth and makes the recommendation more future-proof.
Increase host RAM if you keep offloading
This setup may need roughly 2.3 GB of extra host RAM just for the offloaded portion, before OS and other tools.
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | F | Too heavy | 22.8 tok/s | 4632 ms | 4K |
| Coding | F | Too heavy | 21.3 tok/s | 9103 ms | 4K |
| Agentic Coding | F | Too heavy | 18.6 tok/s | 15115 ms | 4K |
| Reasoning | F | Too heavy | 21.3 tok/s | 10758 ms | 4K |
| RAG | F | Too heavy | 18.6 tok/s | 18893 ms | 4K |
How Qwen 3 30B A3B (30.5B params) fits at each quantization level on RX 7800 XT 16GB (16.0 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 11.9 GB | Low | F0 |
Q3_K_S | 3 | 14.9 GB | Low | F0 |
NVFP4 | 4 | 17.1 GB | Medium | F0 |
Q4_K_M | 4 | 18.6 GB | Medium | F0 |
Q5_K_M | 5 | 22.0 GB | High | F0 |
Q6_K | 6 | 25.0 GB | High | F0 |
Q8_0 | 8 | 32.6 GB | Very High | F0 |
F16 | 16 | 62.5 GB | Maximum | F0 |
Copy-paste commands to run Qwen 3 30B A3B on your machine.
Run
ollama run qwen3:30b-a3bOpções de upgrade
Makes the model fit on the accelerator instead of staying completely out of reach.
Raises estimated decode speed by about 91%.
~$899 MSRP
Makes the model fit on the accelerator instead of staying completely out of reach.
Removes host-memory offload, which is usually the single biggest latency and throughput win.
~$999 MSRP
Makes the model fit on the accelerator instead of staying completely out of reach.
Removes host-memory offload, which is usually the single biggest latency and throughput win.
~$1,899 MSRP
Yes, RX 7800 XT 16GB can run Qwen 3 30B A3B at Q3_K_S quantization (Very compromised (needs ~2.3 GB host RAM)). The recommended Q4_K_M requires 22.6 GB which exceeds available memory, but at Q3_K_S it needs only 18.9 GB. Expected decode speed: 35.7 tok/s.
Qwen 3 30B A3B (30.5B parameters) requires approximately 22.6 GB at Q4_K_M quantization. On RX 7800 XT 16GB, it fits at Q3_K_S using 18.9 GB.
The recommended quantization is Q4_K_M, but on RX 7800 XT 16GB the best fitting quantization is Q3_K_S, which uses 18.9 GB.
On RX 7800 XT 16GB, Qwen 3 30B A3B achieves approximately 35.7 tokens per second decode speed with a time-to-first-token of 5418ms using Q3_K_S quantization.
For coding workloads, Qwen 3 30B A3B on RX 7800 XT 16GB receives a F grade with 21.3 tok/s and 4K context.
On RX 7800 XT 16GB, Qwen 3 30B A3B can safely use up to 4K tokens of context at Q3_K_S quantization. The model's official context limit is 131K, but available memory constrains the safe maximum.
Remove offload with more accelerator memory. Prioritize a GPU or unified-memory tier that fits the whole model natively. Removing offload usually helps more than small compute gains.
Paste this snippet into any page to show a live fit card.
<iframe src="https://willitrunai.com/embed/qwen-3-30b-a3b-on-rx-7800-xt-16gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>
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