Can RX 7900 XT 20GB run gemma-3-4b-it?

AMD · 20 GB GDDR6 · 800 GB/s bandwidth · Google · 4.3B · model ctx up to 128K

Yes — the RX 7900 XT 20GB (20 GB GDDR6) can run gemma-3-4b-it. At Q4 with the default 8K context it needs ≈ 4.15 GB VRAM (weights 2.37 GB + KV cache 0.78 GB + 1 GB runtime overhead), which fits within 20 GB. Decode at Q4/8K: ≈ 130.5 tok/s (estimated, batch 1). FP16 (≈ 10.38 GB) also fits, at ≈ 35.9 tok/s (estimated). 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	3.76 GB	Yes	130.5 est.
Q4	8K default	4.15 GB	Yes	130.5 est.
Q4	32K	6.49 GB	Yes	130.5 est.
FP16	4K	9.99 GB	Yes	35.9 est.
FP16	8K default	10.38 GB	Yes	35.9 est.
FP16	32K	12.72 GB	Yes	35.9 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	2.37 GB	0.78 GB	1 GB	4.15 GB	20 GB
FP16	8.6 GB	0.78 GB	1 GB	10.38 GB	20 GB

Other GPUs that run gemma-3-4b-it

• B200 192GB SXM — ≈1305.4 tok/s Q4 est.
• MI300X 192GB — ≈864.8 tok/s Q4 est.
• H200 141GB SXM5 — ≈783.2 tok/s Q4 est.
• H100 80GB SXM5 — ≈546.6 tok/s Q4 est.
• Gaudi 3 128GB — ≈534.5 tok/s Q4 est.
• A100 80GB SXM4 — ≈332.7 tok/s Q4 est.
• RTX 5090 32GB — ≈292.4 tok/s Q4 est.
• RTX 4090 24GB — ≈164.5 tok/s Q4 est.

All GPUs for gemma-3-4b-it →

Other models for the RX 7900 XT 20GB

• Qwen3-0.6B — ≈636.4 tok/s Q4 est.
• gemma-3-1b-it — ≈509.1 tok/s Q4 est.
• Llama-3.2-1B-Instruct — ≈424.2 tok/s Q4 est.
• Qwen3-1.7B — ≈254.5 tok/s Q4 est.
• Qwen3-30B-A3B — ≈169.7 tok/s Q4 est.
• Qwen3-Coder-30B-A3B-Instruct — ≈169.7 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.

All models on the RX 7900 XT 20GB →