Can RX 7900 XT 20GB run gemma-3-27b-it?

AMD · 20 GB GDDR6 · 800 GB/s bandwidth · google · 27.4B · model ctx up to NoneK

ROCM

Partly — gemma-3-27b-it at Q4 fits the RX 7900 XT 20GB (20 GB GDDR6) at 4K context (≈ 18.81 GB) but not at the default 8K (≈ 21.55 GB needed). Use a shorter context or partial offload. Decode at Q4/8K: ≈ 45.6 tok/s (estimated, batch 1). FP16 needs ≈ 61.28 GB — does not fit on this card. Estimates come from memory-bandwidth math; rows tagged measured override estimates. Relative ranking is more reliable than absolute tok/s. Methodology.

Fit & speed by quant and context

Quant	Context	VRAM needed	Fits?	tok/s (decode)
Q4	4K	18.81 GB	Yes	18.6 ± est.
Q4	8K default	21.55 GB	No	45.6 ± est.
Q4	32K	37.99 GB	No	14.7 ± est.
FP16	4K	58.54 GB	No	1.7 ± est.
FP16	8K default	61.28 GB	No	1.6 ± est.
FP16	32K	77.72 GB	No	1.0 ± est.

Fits = weights + KV(ctx) + 1 GB overhead ≤ 95% of VRAM. Measured anchors are context-agnostic; the fit verdict is recomputed per context. A missing tok/s means the model is far beyond this card (offload-only territory).

VRAM breakdown at 8K context

Quant	Weights	KV cache	Overhead	Total needed	RX 7900 XT 20GB VRAM
Q4	15.07 GB	5.48 GB	1 GB	21.55 GB	20 GB
FP16	54.8 GB	5.48 GB	1 GB	61.28 GB	20 GB

Other GPUs that run gemma-3-27b-it

• B200 192GB SXM — ≈185.8 tok/s Q4 est.
• MI300X 192GB — ≈123.1 tok/s Q4 est.
• H200 141GB SXM5 — ≈111.5 tok/s Q4 est.
• H100 80GB SXM5 — ≈77.8 tok/s Q4 est.
• Gaudi 3 128GB — ≈76.1 tok/s Q4 est.
• A100 80GB SXM4 — ≈47.4 tok/s Q4 est.
• RTX 5090 32GB — ≈41.6 tok/s Q4 est.
• RTX 4090 24GB — ≈23.4 tok/s Q4 est.

All GPUs for gemma-3-27b-it →

Other models for the RX 7900 XT 20GB

• MiniCPM5-1B — ≈471.4 tok/s Q4 est.
• Qwen3.5-2B — ≈254.5 tok/s Q4 est.
• DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx — ≈221.3 tok/s Q4 est.
• GLM-4.7-Flash — ≈169.7 tok/s Q4 est.
• Qwen3-30B-A3B-Instruct-2507 — ≈169.7 tok/s Q4 est.
• Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16 — ≈169.7 tok/s Q4 est.
• gpt-oss-20b — ≈141.4 tok/s Q4 est.
• gemma-4-26B-A4B-it — ≈134.0 tok/s Q4 est.

All models on the RX 7900 XT 20GB →