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UnverifiedRTX 4070 12GB (Ada sm_89) + RTX 5070 12GB (Blackwell sm_120), layer-split via llama.cpp on Ryzen 5800XT Zen 3, 128 GB DDR4, Docker Desktop WSL2CUDA

ggml-org/gpt-oss-120b-GGUF :: gpt-oss-120b-mxfp4-00001-of-00003.gguf MXFP4 @ RTX 4070 12GB (Ada sm_89) + RTX 5070 12GB (Blackwell sm_120), layer-split via llama.cpp on Ryzen 5800XT Zen 3, 128 GB DDR4, Docker Desktop WSL2

https://gotcontext.ai/benchmarks/runs/QzEU9S3gIsI
Decode
5.3tok/s
PP speed (tok/s)
Context
64ktokens
Batch
4096parallel
Top 94% for this config16 runs
Flash Attn

Raw benchmark output

llama-server --no-mmap -ngl 999 --n-cpu-moe 32 --batch-size 4096 --ubatch-size 4096 --tensor-split 0.55,0.45 --parallel 1

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Build diagnostics

Your build is within the typical range for this hardware. No obvious configuration issues detected.

Reproducibility recipe

Copy this to repeat or submit a similar build:

model: "ggml-org/gpt-oss-120b-GGUF :: gpt-oss-120b-mxfp4-00001-of-00003.gguf"
quant: "MXFP4"
hardware: "RTX 4070 12GB (Ada sm_89) + RTX 5070 12GB (Blackwell sm_120), layer-split via llama.cpp on Ryzen 5800XT Zen 3, 128 GB DDR4, Docker Desktop WSL2"
context_length: 65536
batch_size: 4096

Notes from submitter

Official seed run — gotcontext.ai lab rig (RTX 4070 Ada + RTX 5070 Blackwell, layer-split, Ryzen 5800XT, 128GB). Sweep across 4 iterations: --cpu-moe (all experts CPU) = 4.6 tok/s, --n-cpu-moe 35 (1 layer GPU) = 5.0, --n-cpu-moe 32 (4 layers GPU) = 5.3 (current stable), --n-cpu-moe 30 (6 layers GPU) = OOM-killed mid-decode. Each expert layer ~1.6 GB at MXFP4 and always lands on CUDA1 regardless of --tensor-split (CUDA1 ~93% full, CUDA0 ~36%). carteakey.dev's --n-cpu-moe 21 number was on single 24GB RTX 3090 (unsplit pool absorbs larger contiguous allocations). Ctx reduced 131K→65K to free ~1.2 GB VRAM for extra GPU expert layers. First load reads 60 GB from disk into DRAM (1-3 min). PCIe-bound by per-token expert streaming over DDR4.

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