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Builds / RTX 4090 24GB

RTX 4090: Qwen3.8 27B Q4_K_M at 43.1 tok/s (llm-speed, llama.cpp b11803, 6 runs)

Last updated:

Source: llm-speed.com ↗More source: llm-speed.com ↗📏 How measured: reported by the original source; RigBase re-checked the numbers at that source
GPU(s)
RTX 4090 24GB
Amazon · eBay (used) · Newegg
VRAM / unified memory (GB)
24
CPU
not stated
Motherboard
not stated
RAM
not stated
PSU
not stated
Other
not stated
Reported total cost
not stated
Power
not stated

Measured speed (generation tokens/sec)

ModelQuantEnginetok/sPrompt processing (tok/s)Details
Qwen3.8 27BQ4_K_Mllama.cpp build 11803 (a37cc4610)43.1515 @ 154-token prompt
measured TTFT: 0.30 s @ 154-token prompt		context: 8K ctx, chat-short (154-token prompt)📏 Lowest of 6 llm-speed runs on 22 Oct 2026 (43.1-44.2); peak VRAM 18.7 GiB at 8K
Qwen3.8 27BQ4_K_Mllama.cpp build 11803 (a37cc4610)43.02,015 @ 3,224-token prompt
est. TTFT @8k ≈ 4.1 s (calculated from measured prefill)
prefill source: llm-speed.com ↗
measured TTFT: 1.6 s @ 3,224-token prompt		context: chat-long (3,224-token prompt, 1,024 out)📏 Lowest chat-long run listed (43.0-43.7)

Prompt processing = prefill speed (how fast the prompt is read) as reported by the source, with the prompt length it was measured at; blank = the source does not report it. est. TTFT @8k is calculated from the measured prefill speed (8,192 ÷ prefill tok/s), shown only when prefill was measured on a prompt of 512+ tokens. It is not a measurement and ignores load time and caching. measured TTFT is the source's own time-to-first-token. Why prefill matters for coding assistants.

Measured by llm-speed on its own RTX 4090, 22 Oct 2026. Rest of the system not stated.

Current GPU street price (estimate, not the builder's cost)Estimated GPU cost for this build today: ≈€3,955
New retail prices in Germany incl. VAT; used cards are often much cheaper. Prices change daily.
Source: https://llm-speed.com/can-run/qwen3-8-27b/rtx-4090
https://llm-speed.com/r/r_tt9io-8lu9p

Blank fields = not stated in the source. We never estimate build data; GPU street prices above are separately sourced and dated.

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Quick answers: Can RTX 4090 run Qwen3.8 27B?