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Gemma 3 12B IT on the RX 7900 XT

With 20 GB of VRAM, the RX 7900 XT runs Gemma 3 12B IT at Q4_K_M entirely on the GPU with an 8K context (about 9.1 GB needed). At Q8_0 it fits entirely.

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Gemma 3 12B IT

Q4_K_M · 8K context

Excellent

The model needs about 9.1 GB and fits in the 19.4 GB available, with 10.3 GB to spare.

Your hardware
RX 7900 XT 20 GB · 64 GB RAM
Estimated memory
~9.1 GB estimate
VRAM (usable memory)
19.4 GB
GPU only
Yes
CPU/GPU offload
Not required
Generation speed
54–82 tok/s estimate
Largest context in fast memory
128K tokens
Confidence: low

Based on: memory bandwidth (800 GB/s) and model size

Memory breakdown

~9.1 GB (8.5 GB–9.7 GB) needed · estimate

Fits entirely in VRAM · 10.3 GB left

  • Model weights6.8 GB
  • KV cache0.8 GB
  • Runtime overhead1.1 GB
  • Safety margin0.4 GB
Assumptions: context 8K tokens · KV cache f16 · llama.cpp (ROCm) · flash attention on · weights = real file size · sliding-window layers keep 1,024 tokens

EstimateData updated 24 days agoSource: Run LLM Locally engine, Hugging Face config.json + model card

What makes this estimate less reliable

  • no benchmark for this hardware and model yet

Other quantizations on the RX 7900 XT

Gemma 3 12B IT on RX 7900 XT + 64 GB RAM · 8K context
Gemma 3 12B IT Q8_08K~14.2 GB · 36–53 tok/s estimateExcellent
Gemma 3 12B IT Q6_K8K~11.4 GB · 44–65 tok/s estimateExcellent
Gemma 3 12B IT Q5_K_M8K~10.2 GB · 49–73 tok/s estimateExcellent
Gemma 3 12B IT Q4_K_M8K~9.1 GB · 54–82 tok/s estimateExcellent
Gemma 3 12B IT IQ4_XS8K~8.4 GB · 58–90 tok/s estimateExcellent
Gemma 3 12B IT Q3_K_M8K~7.8 GB · 62–96 tok/s estimateExcellent

Alternatives

GPUs that run Gemma 3 12B IT Q4_K_M entirely in VRAM

Other models that fit the RX 7900 XT

Where to buy a RX 7900 XT

Prices and links follow the market you choose.

Radeon RX 7900 XT

20 GB GDDR6 · 800 GB/s · 315 W

ExcellentRuns Gemma 3 12B IT Q4_K_M entirely in memory

Price not available

Availability unknown

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Frequently asked questions

Can the RX 7900 XT run Gemma 3 12B IT?
The model needs about 9.1 GB and fits in the 19.4 GB available, with 10.3 GB to spare.
Which quantization should I use on the RX 7900 XT?
Q8_0 is the highest-precision quantization that fits entirely in VRAM at 8K context. ~14.2 GB / 19.4 GB.
What is the largest context on the RX 7900 XT?
At Q4_K_M, about 128K tokens fit entirely in VRAM with an f16 KV cache. A q8_0 KV cache roughly doubles that.
How fast is Gemma 3 12B IT (RX 7900 XT)?
We estimate 54–82 tok/s (estimate, confidence low). Based on: memory bandwidth (800 GB/s) and model size.