The RX 9070 has 16 GB of GDDR6 memory and is distinct from the RX 9070 XT. Its candidate Qwen3.5-9B Q8 profile can later be compared against other 16 GB cards using the same exact model file and prompts. Shared capacity alone does not establish matching clocks, thermals or response behavior.
For a meaningful test, note the driver and runtime, actual free GPU memory, desktop load and completed-output timing. A 32K catalog context is requested, not qualified. The Windows Vulkan path and private Linux path need separate card evidence; neither can borrow a result from another Radeon variant.
RX 9070 non-XT Windows Qwen3.8 agent and context report
Method (as reported): One-slot llama-server with FA, q4 K/V and MTP2; on-box long-prompt and agent harness observations.
Reported GPU setup RX 9070 non-XT 16GB
GPU count 1
Operating system Windows (Windows 11)
Engine llama.cpp b10587, Clang 20.1.8
Backend ROCm 7.14 HIP
Model Qwen3.8-27B IQ3-MIX (vmarcelo)
Configured context 131,072 tokens
Actual input input length not reported
Reported context On-box test used about 83K occupied prompt tokens.
Simultaneous clients 1
Server slots 1
Workers 1
Topology single
Speculative decoding MTP2 plus ngram-mod
CPU Ryzen 7 7800X3D
Memory configuration 32 GB RAM
23.1 tok/s — generation speed (per request) · API server · 1 client On-box approximately 83K occupied prompt; q4_0 K/V, MTP2 This row: configured context: 131,072 tokens
335 tok/s — prompt speed (per request) · API server · 1 client Same approximately 83K occupied prompt This row: configured context: 131,072 tokens
≈3.3 s — time to first token (per request) · agent session · 1 client Approximate continuation TTFT in agent harness use This row: configured context: 131,072 tokens
5.4 tok/s — generation speed (per request) · API server · 1 client Q8_0 K/V exceeded dedicated VRAM; WDDM shared-memory spill This row: configured context: 131,072 tokens
Not reported: system memory, Exact GGUF digest, Successful HIP driver version, Repeated samples and variance, Physical WDDM residency, Concurrent-client rate
IQ3-MIX differs from FastLLM catalog artifacts.
Reported VRAM values are not independent proof of dedicated residency.
Q8 KV spilled to shared memory in the author's setup.
The small quality spot-check does not establish broad model quality.
Discussion
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