Yi 1.5 6B Chat needs ~6.1 GB VRAM. RX 590 8GB has 8.0 GB. With Q4_K_M quantization, expect ~30 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
30.1 tok/s
TTFT
6437 ms
Safe context
60K
Memory
6.1 GB / 8.0 GB
This setup is broadly balanced for this model.
Older PCIe generation
PCIe 3.0 is workable, but it compounds the penalty when you offload heavily or try to scale across multiple cards.
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | C | Runs well | 30.1 tok/s | 3511 ms | 60K |
| Coding | C | Runs well | 30.1 tok/s | 6437 ms | 60K |
| Agentic Coding | C | Tight fit | 30.1 tok/s | 9363 ms | 60K |
| Reasoning | C | Runs well | 30.1 tok/s | 7607 ms | 60K |
| RAG | C | Tight fit | 30.1 tok/s | 11703 ms | 60K |
Inference speed
Estimated decode speed (tokens/sec) for Yi 1.5 6B Chat at Q4_K_M across popular GPUs and Apple Silicon, using the fastest local runtime per device. Fastest is RTX 5090 32GB at ~114 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 | 114.0 | Fits |
| RTX 4090 24GB | 24 GB | Q4_K_M | 84.0 | Fits |
| RTX 4080 Super 16GB | 16 GB | Q4_K_M | 84.0 | Fits |
| RTX 3090 24GB | 24 GB | Q4_K_M | 84.0 | Fits |
| RTX 4070 12GB | 12 GB | Q4_K_M | 84.0 | Fits |
RX 7900 XTX 24GB | 24 GB | Q4_K_M | 84.0 | Fits |
MacBook Pro M4 Max 128GB | 128 GB | Q4_K_M | 84.0 | Fits |
Mac Studio M3 Ultra 256GB | 256 GB | Q4_K_M | 84.0 | Fits |
Mac Studio M2 Ultra 128GB | 128 GB | Q4_K_M | 84.0 | Fits |
Mac Studio M1 Ultra 128GB | 128 GB | Q4_K_M | 84.0 | Fits |
MacBook Pro M4 Max 64GB | 64 GB | Q4_K_M | 84.0 | Fits |
MacBook Pro M3 Max 64GB | 64 GB | Q4_K_M | 65.6 | Fits |
| RTX 3060 12GB | 12 GB | Q4_K_M | 64.9 | Fits |
MacBook Pro M1 Max 64GB | 64 GB | Q4_K_M | 60.1 | Fits |
| RTX 4060 8GB | 8 GB | Q4_K_M | 54.3 | Fits |
MacBook Pro M4 Pro 48GB | 48 GB | Q4_K_M | 52.8 | Fits |
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 6B Chat (6B params) fits at each quantization level on RX 590 8GB (8.0 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 2.3 GB | Low | C52 |
Q3_K_S | 3 | 2.9 GB | Low | C53 |
NVFP4 | 4 | 3.4 GB | Medium | C53 |
Q4_K_M | 4 | 3.7 GB | Medium | C53 |
Q5_K_M | 5 | 4.3 GB | High | C53 |
Q6_KBest for your GPU | 6 | 4.9 GB | High | C53 |
Q8_0 | 8 | 6.4 GB | Very High | F0 |
F16 | 16 | 12.3 GB | Maximum | F0 |
Copy-paste commands to run Yi 1.5 6B Chat on your machine.
Run
lms load hf-bartowski--yi-1-5-6b-chat-gguf && lms server startUpgrade options
Intel Arc B570 10GBBudget pickRaises estimated decode speed by about 86%.
Adds memory headroom for longer context windows and future model growth.
~$219 MSRP
RTX 5070 12GBBest valueRaises estimated decode speed by about 279%.
Adds memory headroom for longer context windows and future model growth.
~$549 MSRP
Yes, RX 590 8GB can run Yi 1.5 6B Chat with a C grade (Runs well). Expected decode speed: 30.1 tok/s.
Yi 1.5 6B Chat (6B parameters) requires approximately 6.1 GB of memory with Q4_K_M quantization.
The recommended quantization for Yi 1.5 6B Chat is Q4_K_M, which balances quality and memory efficiency.
On RX 590 8GB, Yi 1.5 6B Chat achieves approximately 30.1 tokens per second decode speed with a time-to-first-token of 6437ms using Q4_K_M quantization.
For coding workloads, Yi 1.5 6B Chat on RX 590 8GB receives a C grade with 30.1 tok/s and 60K context.
On RX 590 8GB, Yi 1.5 6B Chat can safely use up to 60K tokens of context. The model's official context limit is —, 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/hf-bartowski--yi-1-5-6b-chat-gguf-on-rx-590-8gb" 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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