Every number on this page comes from one machine, a Strix Halo box with 128GB unified memory, under a recorded configuration, with the build hash and the requested flash-attention mode logged from the benchmark's own JSON. Rows are added when a build is worth measuring, not on a fixed schedule. For breadth across many stacks, the community toolbox benchmarks cover more ground; this page trades breadth for controlled depth: pinned builds, same-base comparisons, a context-depth axis, and drift stated instead of smoothed.
Drift note: Deep dense prompt-processing cells vary a few percent day to day on this hardware. Deltas within a run matter more than absolute digits across days.
Configuration legend: cfg-A means amd_iommu=on iommu=pt, used before 2026-07-18. cfg-B means amd_iommu=off, the current production configuration. cfg-C means Fedora 44, kernel 7.1.5, Mesa/RADV 26.1.5, amd_iommu=off, Vulkan only, and production build 10215 with nine curated patches.
Config epoch C opened on 2026-07-31. The reference box moved to Fedora 44, kernel 7.1.5, and Mesa/RADV 26.1.5; ROCm was removed, and production moved to the nine-patch Vulkan build. ROCm rows are historical because the box no longer carries a ROCm stack.
Reference Set v1 is unchanged. cfg-B and cfg-C rows use the same two model files, so they are comparable model-wise even though the platform and production build differ.
Reference Set v1 (July 2026)
Qwen3.6-35B-A3B UD-Q5_K_XL (MoE)
Qwen3.6-27B UD-Q5_K_XL (dense)
The set changes only by explicit version bump. Every bump gets a changelog entry, a full re-baseline, and the old set's table archived on this page.
cfg-C reference results
All cfg-C rows use f16 K/V, batch 2048, ubatch 512, mmap off, prompt length 512, generation length 128, and depths 0 and 32768. Production commit 6d78899ea, build 10215, is base b10206 plus nine curated community patches. The patched provenance is part of every row set and must not be read as stock upstream behavior.
Qwen3.6-35B-A3B UD-Q5_K_XL
| Date | Build | Commit | Backend | Model and quant | FA requested | Config | Depth | pp512 t/s | tg128 t/s |
|---|---|---|---|---|---|---|---|---|---|
| 2026-07-31 | 10215 | 6d78899ea |
Vulkan | Qwen3.6-35B-A3B UD-Q5_K_XL | 1 | cfg-C | 0 | 1194.116 | 56.721 |
| 2026-07-31 | 10215 | 6d78899ea |
Vulkan | Qwen3.6-35B-A3B UD-Q5_K_XL | 1 | cfg-C | 32768 | 761.794 | 47.042 |
| 2026-07-31 | 10215 | 6d78899ea |
Vulkan | Qwen3.6-35B-A3B UD-Q5_K_XL | 0 | cfg-C | 0 | 1172.101 | 56.680 |
| 2026-07-31 | 10215 | 6d78899ea |
Vulkan | Qwen3.6-35B-A3B UD-Q5_K_XL | 0 | cfg-C | 32768 | 510.764 | 41.787 |
Qwen3.6-27B UD-Q5_K_XL
| Date | Build | Commit | Backend | Model and quant | FA requested | Config | Depth | pp512 t/s | tg128 t/s |
|---|---|---|---|---|---|---|---|---|---|
| 2026-07-31 | 10215 | 6d78899ea |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 1 | cfg-C | 0 | 353.908 | 10.345 |
| 2026-07-31 | 10215 | 6d78899ea |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 1 | cfg-C | 32768 | 251.952 | 9.308 |
| 2026-07-31 | 10215 | 6d78899ea |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 0 | cfg-C | 0 | 344.766 | 10.327 |
| 2026-07-31 | 10215 | 6d78899ea |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 0 | cfg-C | 32768 | 182.743 | 7.983 |
What the prefill patch changes
These same-base attribution builds use Qwen3.6-27B UD-Q5_K_XL, f16 K/V, Vulkan, and flash attention on under cfg-C. The community-patched variants are under upstream discussion and do not describe stock upstream behavior.
| Date | Build | Commit | Backend | Model and quant | FA requested | Config | Variant | pp@32k t/s | pp@65k t/s |
|---|---|---|---|---|---|---|---|---|---|
| 2026-07-31 | 10206 | 69e62fc77 |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 1 | cfg-C | Stock upstream b10206 | 94.457 | 29.803 |
| 2026-07-31 | 10214 | 47f93a822 |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 1 | cfg-C | Contiguize removed | 134.537 | 45.095 |
| 2026-07-31 | 10214 | 1e355da72 |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 1 | cfg-C | Hoist removed | 242.170 | 180.738 |
| 2026-07-31 | 10212 | 7ad21320f |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 1 | cfg-C | Stock plus contiguize and prerequisites | 237.354 | 180.390 |
| 2026-07-31 | 10215 | 6d78899ea |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 1 | cfg-C | Full nine-patch production | 251.979 | 198.162 |
The owning change is contiguize strided f16 KV for FA prefill: removing it brings the dense cliff back, while adding it with its prerequisites removes the collapse.
Generation is unaffected, staying within 0.09% across all five binaries.
On the collapsing path, repeated deep dense cells scatter by 5 to 10%. On the fixed path, the same cells reproduce within about 0.3%. Repeat deep dense runs before comparing small deltas.
Archive: earlier configurations
All rows use batch 2048, ubatch 512, mmap off, prompt length 512, generation length 128, and depths 0 and 32768.
Qwen3.6-35B-A3B UD-Q5_K_XL
| Date | Build | Commit | Backend | Model and quant | FA requested | Config | Depth | pp512 t/s | tg128 t/s |
|---|---|---|---|---|---|---|---|---|---|
| 2026-07-23 | 9870 | 2d973636e |
ROCm | Qwen3.6-35B-A3B UD-Q5_K_XL | 1 | cfg-B | 0 | 1089.106 | 49.313 |
| 2026-07-23 | 9870 | 2d973636e |
ROCm | Qwen3.6-35B-A3B UD-Q5_K_XL | 1 | cfg-B | 32768 | 608.617 | 42.831 |
| 2026-07-18 | 9870 | 2d973636e |
Vulkan | Qwen3.6-35B-A3B UD-Q5_K_XL | 0 | cfg-B | 0 | 1046.945 | 56.597 |
| 2026-07-18 | 9870 | 2d973636e |
Vulkan | Qwen3.6-35B-A3B UD-Q5_K_XL | 0 | cfg-B | 32768 | 483.272 | 41.578 |
| 2026-07-18 | 9870 | 2d973636e |
Vulkan | Qwen3.6-35B-A3B UD-Q5_K_XL | 1 | cfg-B | 0 | 1076.145 | 56.780 |
| 2026-07-18 | 9870 | 2d973636e |
Vulkan | Qwen3.6-35B-A3B UD-Q5_K_XL | 1 | cfg-B | 32768 | 685.943 | 46.992 |
Qwen3.6-27B UD-Q5_K_XL
| Date | Build | Commit | Backend | Model and quant | FA requested | Config | Depth | pp512 t/s | tg128 t/s |
|---|---|---|---|---|---|---|---|---|---|
| 2026-07-23 | 9870 | 2d973636e |
ROCm | Qwen3.6-27B UD-Q5_K_XL | 1 | cfg-B | 0 | 375.528 | 9.977 |
| 2026-07-23 | 9870 | 2d973636e |
ROCm | Qwen3.6-27B UD-Q5_K_XL | 1 | cfg-B | 32768 | 223.078 | 9.101 |
| 2026-07-18 | 9870 | 2d973636e |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 0 | cfg-B | 0 | 342.351 | 10.362 |
| 2026-07-18 | 9870 | 2d973636e |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 0 | cfg-B | 32768 | 181.652 | 8.001 |
| 2026-07-18 | 9870 | 2d973636e |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 1 | cfg-B | 0 | 350.971 | 10.381 |
| 2026-07-18 | 9870 | 2d973636e |
Vulkan | Qwen3.6-27B UD-Q5_K_XL | 1 | cfg-B | 32768 | 97.042 | 9.336 |
Changelog
2026-08-05: production moved to build 10283 (b7b85da9), the full strix-halo-vulkan branch tip. The cfg-C tables below stay as measured on build 10215; a cfg-D reference set follows once it is re-baselined.
2026-07-31: Added cfg-C (Fedora 44, Mesa 26.1.5, production build 10215 with nine curated patches); earlier cfg-A and cfg-B tables moved to the archive section; added the dense prefill patch attribution table.
2026-07-23: page created, initial data from tuning series parts 1-2 and the KV verification