Yi 1.5 9B needs ~9.5 GB VRAM. RX 6800 16GB has 16.0 GB. With Q4_K_M quantization, expect ~56 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
Fit status
Runs well
Decode
55.8 tok/s
TTFT
3471 ms
Safe context
4K
Memory
9.5 GB / 16.0 GB
This setup is broadly balanced for this model.
No major red flags
This recommendation has enough memory headroom and acceptable estimated speed for the selected workload.
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | B | Runs well | 55.8 tok/s | 1893 ms | 4K |
| Coding | B | Runs well | 55.8 tok/s | 3471 ms | 4K |
| Agentic Coding | B | Runs well | 55.8 tok/s | 5048 ms | 4K |
| Reasoning | B | Runs well | 55.8 tok/s | 4102 ms | 4K |
| RAG | B | Runs well | 55.8 tok/s | 6310 ms | 4K |
Inference speed
Estimated decode speed (tokens/sec) for Yi 1.5 9B at Q4_K_M across popular GPUs and Apple Silicon, using the fastest local runtime per device. Fastest is RTX 5090 32GB at ~126 tok/s. Speed is memory-bandwidth bound, so cards that fit the whole model in VRAM run far faster than ones that offload to system RAM.
| GPU / Mac | Memory | Quant | Speed (tok/s) | Fits? |
|---|---|---|---|---|
 RTX 5090 32GB | 32 GB | Q4_K_M | 126.0 | Fits |
| RTX 4090 24GB | 24 GB | Q4_K_M | 126.0 | Fits |
| RTX 3090 24GB | 24 GB | Q4_K_M | 126.0 | Fits |
RX 7900 XTX 24GB | 24 GB | Q4_K_M | 126.0 | Fits |
| RTX 4080 Super 16GB | 16 GB | Q4_K_M | 121.0 | Fits |
Mac Studio M3 Ultra 256GB | 256 GB | Q4_K_M | 110.3 | Fits |
Mac Studio M2 Ultra 128GB | 128 GB | Q4_K_M | 91.9 | Fits |
Mac Studio M1 Ultra 128GB | 128 GB | Q4_K_M | 87.2 | Fits |
| RTX 4070 12GB | 12 GB | Q4_K_M | 74.9 | Fits |
MacBook Pro M4 Max 128GB | 128 GB | Q4_K_M | 74.3 | Fits |
MacBook Pro M4 Max 64GB | 64 GB | Q4_K_M | 74.3 | Fits |
MacBook Pro M3 Max 64GB | 64 GB | Q4_K_M | 47.5 | Fits |
| RTX 3060 12GB | 12 GB | Q4_K_M | 47.1 | Fits |
MacBook Pro M1 Max 64GB | 64 GB | Q4_K_M | 43.6 | Fits |
MacBook Pro M4 Pro 48GB | 48 GB | Q4_K_M | 38.3 | Fits |
| RTX 4060 8GB | 8 GB | Q4_K_M | 23.3 | Heavy offload |
Estimates for single-stream decoding at Q4_K_M; real tokens/sec varies with prompt length, context, batch size, and runtime build. Prompt processing (prefill) is faster than the decode figures shown here.
How Yi 1.5 9B (9B params) fits at each quantization level on RX 6800 16GB (16.0 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 3.5 GB | Low | C52 |
Q3_K_S | 3 | 4.4 GB | Low | C53 |
NVFP4 | 4 | 5.0 GB | Medium | C53 |
Q4_K_M | 4 | 5.5 GB | Medium | C54 |
Q5_K_M | 5 | 6.5 GB | High | C55 |
Q6_K | 6 | 7.4 GB | High | B56 |
Q8_0Best for your GPU | 8 | 9.6 GB | Very High | B56 |
F16 | 16 | 18.5 GB | Maximum | F0 |
Copy-paste commands to run Yi 1.5 9B on your machine.
Run
lms load Yi-1.5-9B-Chat && lms server startYes, RX 6800 16GB can run Yi 1.5 9B with a B grade (Runs well). Expected decode speed: 55.8 tok/s.
Yi 1.5 9B (9B parameters) requires approximately 9.5 GB of memory with Q4_K_M quantization.
The recommended quantization for Yi 1.5 9B is Q4_K_M, which balances quality and memory efficiency.
On RX 6800 16GB, Yi 1.5 9B achieves approximately 55.8 tokens per second decode speed with a time-to-first-token of 3471ms using Q4_K_M quantization.
For coding workloads, Yi 1.5 9B on RX 6800 16GB receives a B grade with 55.8 tok/s and 4K context.
On RX 6800 16GB, Yi 1.5 9B can safely use up to 4K tokens of context. The model's official context limit is 4K, but available memory constrains the safe maximum.
Paste this snippet into any page to show a live fit card.
<iframe src="https://willitrunai.com/embed/yi-1.5-9b-on-rx-6800-16gb" 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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