Qwen3.8-27B on 1 DGX Spark

SGLang DSpark on one DGX Spark, C1

Qwen3.8-27B on 1 DGX Spark. One-node C1 slice of a community Spark report: SGLang image digest febfb971, sparkrun 0.3.4, RadixArk NVFP4 weights, and a separate RadixArk DSpark drafter. Two-node and four-node results in the same report are not this pin.

The catalog VRAM estimate for this checkpoint is on the Qwen3.8-27B VRAM page.

Community component placement

Copies text for another assistant or a person to review. Nothing is deployed.

This is not a fit and not a finished deployment. Source reported; not reproduced by this site.

Hardware matches this pin. 1 nodes. TP 1. EP unknown.

Weight revision is unresolved.

As-pinned recipe.

  • nvfp4-manifest: Apache-2.0 on the current RadixArk NVFP4 manifest card. Commercial use unknown. Current card only. The timed weight revision is unknown.
  • dspark: other. Commercial use unknown. The DSpark manifest license field is other. It does not inherit Apache-2.0 from the NVFP4 card or the base model.
  • The same report lists 51.8 tok/s at two nodes and 77.3 tok/s at four nodes. Those are different topologies. Four nodes are not four times one node.
  • TP2 times data-parallel 2 at C32 was 16.8 tok/s per user in that report, against 11.0 for TP4. Two pairs are not this one-node pin and are not a TP4 group.
  • Weight and drafter revisions for the timed run were not printed.

Do not add these rows together. Main weights overlap subcomponents. CPU and a unified pool are one residence, not extra capacity.

Placements are not applied to the calculator memory verdict.

Logical checkpoint

File ledger. Not a per-rank residence.

NVFP4 weights

File ledger.

21921697280 bytes (20.416 GiB). cluster total, not one rank.

UMA

GPU and CPU share this pool.

Dense backbone

Shared UMA pool. Resident matmul.

File size unknown.

External DSpark

Shared UMA pool. Resident matmul.

3714723322 bytes (3.460 GiB). cluster total, not one rank.

KV cache

Shared UMA pool. Attention cache.

File size unknown.

Recurrent state

Shared UMA pool. Recurrent state.

File size unknown.

Workspace

Shared UMA pool. Runtime scratch.

File size unknown.

Unknown

Residence unknown. Not zero.

Vision tower

Unknown residence. Resident matmul.

File size unknown.

Absent: Routed experts, Engram, PLE. Absence is not zero bytes.

Resident bytes: unknown.

Placement

Local disk path

Not a drag-to-fit control.

Other rejected paths

Other residences

Full config and source evidence
  • NVFP4 weights
    The NVFP4 manifest file size is the current RadixArk artifact. It is the inclusive main ledger for this pin. The external drafter is not inside it.
    One Spark unified pool after load. Manifest bytes are not a resident measurement.
    21921697280 bytes (20.416 GiB). cluster total, not one rank.
    Per-rank storage: unknown. File ledger.
    Subcomponents can overlap this main-weight row. Do not add them into the checkpoint.
    Access: Resident matmul.
    The research brief does not tie this current manifest revision to the measured run. These file bytes are not resident memory and are not a fit.
  • Routed experts
    There is no routed-expert stack on Qwen3.8-27B. The 6B active figure belongs to Qwen3.8-Flash-Next and is not a weight size for this model.
    Not present. Do not substitute a 6B active count for these weights.
    File size unknown.
    Per-rank storage: unknown. Not in this recipe.
    This row can overlap main weights. Do not add it again.
    Access: Not in this recipe.
    No routed-expert bytes exist on Qwen3.8-27B.
  • Dense backbone
    Qwen3.8-27B is a dense vision-language checkpoint. Its language stack is resident matmul. This row overlaps the main file and is not a second copy.
    Inside the NVFP4 file, in the unified pool. 64 layers: 48 Gated DeltaNet plus 16 attention layers.
    File size unknown.
    Per-rank storage: unknown. Overlaps the file ledger.
    Subcomponents can overlap this main-weight row. Do not add them into the checkpoint.
    Access: Resident matmul.
    Dense bytes were not split out of the main file.
  • Engram
    This Qwen profile has no Engram table. A PLE lookup, when this model has one, is a different component.
    Not present.
    File size unknown.
    Per-rank storage: unknown. Not in this recipe.
    This row can overlap main weights. Do not add it again.
    Access: Not in this recipe.
    No Engram bytes exist on this profile.
  • PLE
    Qwen3.8-27B does not use a 51B n-gram PLE table. SSD offload for this model is not the Flash-Next file-backed PLE path.
    Not present.
    File size unknown.
    Per-rank storage: unknown. Not in this recipe.
    This row can overlap main weights. Do not add it again.
    Access: Not in this recipe.
    No PLE bytes exist on Qwen3.8-27B.
  • Vision tower
    Qwen3.8-27B is a vision-language checkpoint. The vision tensors are inside the main NVFP4 file. This text C1 cell does not name a separate projector and does not say whether the vision tower was loaded. That is not the same as vision being absent, and it is not a second copy of the 4090 F16 projector.
    Inside the inclusive main ledger. Enabled or loaded residency for this cell is unknown.
    File size unknown.
    Per-rank storage: unknown. Overlaps the file ledger.
    Subcomponents can overlap this main-weight row. Do not add them into the checkpoint.
    Access: Resident matmul.
    Whether this text cell loaded the vision tower was not stated.
    Vision bytes were not split out of the main artifact.
  • External DSpark
    RadixArk/Qwen3.8-27B-DSpark is a separate artifact with its own license field. It is not inside the NVFP4 file and it is not the internal MTP.
    Separate drafter file. License field other. Current manifest bytes are not the timed revision.
    3714723322 bytes (3.460 GiB). cluster total, not one rank.
    Per-rank storage: unknown. Separate from the file ledger.
    This row can overlap main weights. Do not add it again.
    Access: Resident matmul.
    The research brief does not tie this current manifest revision to the measured run. These file bytes are not resident memory and are not a fit.
    Do not add these bytes into the NVFP4 ledger and call the sum a fit.
  • KV cache
    KV is stored for the 16 attention layers, not for all 64 layers. Recurrent state is the other row. A cookbook byte-per-token anchor is not multiplied into a fit here.
    KV dtype for this one-node cell was not printed. Attention cache only. Not a 64-layer cache.
    File size unknown.
    Per-rank storage: unknown. Runtime, not weights.
    This row can overlap main weights. Do not add it again.
    Access: Attention cache.
    This module does not multiply a per-token width by context.
    Native context 262144 and the 1M extension are not automatically verified by a shorter recipe.
  • Recurrent state
    48 Gated DeltaNet layers keep a fixed recurrent state. That state is present at short context. It is not the KV cache, and a cookbook's approximate megabyte label is not stored as bytes.
    The Spark's one unified pool. Fixed state slots, separate from the 16 attention KV layers.
    File size unknown.
    Per-rank storage: unknown. Runtime, not weights.
    This row can overlap main weights. Do not add it again.
    Access: Recurrent state.
    Slot count depends on the runtime. One slot is not the whole state budget.
    Approximate megabytes were not converted.
  • Workspace
    No process-memory integer was printed for this one-node cell.
    The same unified pool. Host RAM is not a second budget.
    File size unknown.
    Per-rank storage: unknown. Runtime, not weights.
    This row can overlap main weights. Do not add it again.
    Access: Runtime scratch.
    No workspace byte count was published.
  • Pinned source Forum report cited by the research brief. The revision field is the image digest named there, not a git commit of the forum page. The page itself was not fetched into the cache. febfb971c7352570fc445c466ebd6ffc9d896024958e544a60f2137fd85856b1
  • Pinned source Current NVFP4 manifest. Not tied to the timed run. 319f741cce68d7914884900c138a1fbb70a42f30
  • Pinned source Current DSpark manifest, license field other. Not tied to the timed run. b9a5dbdf03bc999c6c73c426b19c2d9041cea393
  • Pinned source Official BF16 scope only. 1d4bf0f2ff6012fd82039f2fa52739d0dd7c60c0

Speed figures in the copied brief are maintainer observations, not a measurement by this site.

Hashes, preflight, and reported observations

Hardware nvidia-dgx-spark-128gb-unified. Pool One DGX Spark has one unified pool. Host RAM is that pool. It is not added again. This pin is one node, not four nodes and not 512 GB.. Weight pin manifest-not-tied-to-report.

Checkpoint RadixArk/Qwen3.8-27B-NVFP4 revision unknown. Manifest 319f741cce68d7914884900c138a1fbb70a42f30. Runtime Reported image lmsysorg/sglang@sha256:febfb971c7352570fc445c466ebd6ffc9d896024958e544a60f2137fd85856b1, sparkrun 0.3.4.. Commit febfb971c7352570fc445c466ebd6ffc9d896024958e544a60f2137fd85856b1.

The reported cell is C1, 128 input tokens and 128 output tokens. That is not a 131072-context llama.cpp run and not a 1M context proof. Request slots for the whole server were not printed beyond that C1 cell. Per-stream versus paged KV was not printed. allocationPolicy unknown is that gap. kvPoolIsPerStream false does not mean a shared pool was measured.

Commercial recommendation: false. Memory fit claimed: false. Deployment done: false.

  • nvfp4-manifest: Apache-2.0 on the current RadixArk NVFP4 manifest card. SPDX Apache-2.0. Commercial use unknown. Current card only. The timed weight revision is unknown.
  • dspark: other. SPDX unknown. Commercial use unknown. The DSpark manifest license field is other. It does not inherit Apache-2.0 from the NVFP4 card or the base model.

Dense model. No routed experts. Do not import Flash-Next's 6B active label or 512 experts. Official BF16 safetensors sum to 55,563,006,776 bytes at manifest revision 1d4bf0f2. The index payload 55,562,855,904 bytes is a different number and is not stored here. Served GGUF or NVFP4 bytes are not this official file. Checkpoint file 55563006776 bytes (51.747 GiB).

Preflight

  • Match the image digest before comparing speed. A newer SGLang tag is not this pin.
  • Keep the external DSpark drafter separate from the NVFP4 weights. Do not replace it with incoai DFlash2.
  • The measured weight revision is unknown. Manifest revision 319f741c is only the current card.
  • This pin is one node and C1, with 128 input tokens and 128 output tokens in the reported cell. It does not accept a TP4 layout.

Validation

  • The research brief's one-node C1 cell is 36.6 tok/s and TTFT 246 ms, 128 in and 128 out.
  • This site did not run that cell.

Rollback

  • Return to the previous image digest and the previous weight and drafter files. This module does not pull an image or restart a service.

Sources

Reported observations

Maintainer observations, not a measurement by this site, and not a forecast.

  • One-node C1: 36.6 tok/s, TTFT 246 ms. 128 input and 128 output tokens. Same report's two-node 51.8 and four-node 77.3 are not this pin. Source report only.
  • Do not blend with qwen3.8-27b-kelnei-4090-llamacpp
  • NVFP4 weights: resident bytes are unknown.
  • Routed experts: resident bytes are unknown.
  • Dense backbone: resident bytes are unknown.
  • Engram: resident bytes are unknown.
  • PLE: resident bytes are unknown.
  • Vision tower: resident bytes are unknown.
  • External DSpark: resident bytes are unknown.
  • KV cache: resident bytes are unknown.
  • Recurrent state: resident bytes are unknown.
  • Workspace: resident bytes are unknown.
  • Runtime claimed by this site: false. Summing components creates a fit: false. The generic calculator verdict is unchanged.