Why
Runs a 27B dense model on 4x Intel Arc Pro B70 (32 GB each) with vLLM tensor parallelism. INT4 fits comfortably and runs faster than BF16 on this hardware.
Load with vLLM
vllm serve devan-carlin/Qwen3.8-27B-int4-AutoRound \
--quantization auto-round \
--tensor-parallel-size 4 \
--max-model-len 262144 \
--kv-cache-dtype fp8 \
--enable-prefix-caching \
--gpu-memory-utilization 0.85 \
--trust-remote-code
Note: loading mixed symmetric/asymmetric INT4 checkpoints on the XPU/ARK path requires the qzeros guard fix (see the vLLM PR referenced below). Without it, symmetric layers crash with a copy_() shape mismatch during weight loading.
Benchmark (4x Intel Arc Pro B70, TP=4, max_tokens=16384)
Table with columns: Model, Gen speed, Notes| Model | Gen speed | Notes |
|---|
| INT4 (this repo) | 47.8 tok/s | 18 GB |
| Qwen3.8-27B BF16 | 30.2 tok/s | ~52 GB |
- 58% faster than BF16
- Quality parity on math, logic, algorithm, and code prompts (identical final answers)
- INT4 reasons more verbosely (more completion tokens), so on very long outputs it can hit a fixed
max_tokens cap earlier — raise the cap if needed
Quantization details
- Method: AutoRound (Intel)
- Bits: 4, group size: 128, symmetric packing
mtp.fc kept in BF16; MTP layers quantized to INT4 (model stays MTP-capable)
License
Apache-2.0 (same as the base model).
Quantized and benchmarked by devan-carlin on 4x Intel Arc Pro B70 (XPU).