Build and verification record

Objective

Create a reproducible DS4 package that maximizes target-model quality within a 128 GB unified-memory envelope. Preserve exact native MXFP4 routed experts on the ten sensitivity-selected layers and retain the proven low-bit/Q8 policy everywhere else.

Inputs and toolchain

All weights were regenerated from apetersson/DeepSeek-V4-Flash-0731-Abliterated-FP8.
The sparse reference GGUF supplied metadata, tokenizer, tensor order and shapes only.
All 48 source-shard hashes, source metadata and the abliteration manifest were verified before conversion.
The routed-expert imatrix supplied exact coverage for the 129 tensors whose output types consume calibration data.
DS4 source revision: d516d4eeb82c454aeb2831af1b1961801d6b571b.
Upstream ds4f-mxfp4 base: 4893e0c40fba03dbc85555faeb035799aa04e0b6.
Quantizer SHA-256: f0a381f4ada808ea2afa740d964354fa327fc1235ba7cebf50874eb89fb97ac5.
Runtime SHA-256: 2aaf20469b9918d6d6ab8787a02811c11228547cd979787879a03dba8a9e7824.

Quantization policy

Native MXFP4 gate/up/down routed experts on layers 10, 14, 30, 34, 37, 38, 39, 40, 41, 42.
IQ2_XXS gate/up and Q2_K down routed experts on the other 33 MoE layers.
Q8 attention, shared-expert and output tensors.
Protected F16 indexer and auxiliary tensors.
DSpark support with IQ2_XXS gate/up and native MXFP4 down projections for target layers 40, 41 and 42.

Conversion gates

Strict imatrix mode passed for main and DSpark conversions.
Main GGUF contains exactly 1,328 tensors and the intended 30 MXFP4 tensors.
DSpark support contains exactly 81 tensors and three MXFP4 down aggregates.
Every native tensor comparison required an explicit byte_compare: OK.
All 30 main and three DSpark MXFP4 tensors independently reproduced the source FP4 codes and scale bytes.
ds4 --cpu --inspect --dspark-strict reported zero missing tensors, invalid bindings or metadata errors.
The final GGUF hashes are recorded in SHA256SUMS.

Result

Component	Bytes	GiB
Main GGUF	`102,826,238,912`	`95.7644`
DSpark support	`7,297,737,120`	`6.7965`
Combined	`110,123,976,032`	`102.5609`

Native MXFP4 improves fidelity over a second Q4_K requantization and uses 4.25 bits per weight rather than 4.50. Native MXFP4 Metal and the mixed DSpark path are newer than mature Q4_K kernels, so throughput should be measured on the target system.

One-million-token context

Recommended target-only mode:

ds4 --metal \
  -m DeepSeek-V4-Flash-0731-Abliterated-DS4-Quality128.gguf \
  --ctx 1048576 --prefill-chunk 2048

Estimated residency is at most 110.30 GiB. DSpark can be tested with a 1,024 token prefill chunk; estimated residency is 114.02 GiB. A 4,096-token chunk with DSpark is estimated at 123.24 GiB and is not a reliably resident mode on a machine whose Metal recommended working set is approximately 121.60 GiB.