Can I Run Gemma 3 on AMD Radeon RX 7900 XT?

Name: LLM Configurator — GPU VRAM Checker
Author: LLM Configurator

Written by Jakub Rusinowski · Last updated March 12, 2025

Yes, comfortably — you'll have ~3.5 GB of headroom running Gemma 3 27B Instruct at Q4_K_M (16.5 GB, ~48 tok/s (est.)).

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Check price on Amazon — AMD Radeon RX 7900 XT 20GB

AMD Radeon RX 7900 XT Specs

VRAM	20 GB
Memory Bandwidth	800 GB/s

Gemma 3 27B Instruct on the AMD Radeon RX 7900 XT: VRAM by quantization

Quant	VRAM needed	Fits 20 GB?	Max context
F16	59 GB	✗ No	—
Q8_0	33.6 GB	✗ No	—
Q6_K	27.1 GB	✗ No	—
Q5_K_M	24.1 GB	✗ No	—
Q4_K_M	21.3 GB	✗ No	—
Q3_K_M	16.5 GB	✓ Yes	4K
Q2_K	13.8 GB	✓ Yes	8K

VRAM needed assumes a 4K-token context with an f16 KV cache; “Max context” is the largest window that still fits in 20 GB. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.

Gemma 3 Sizes That Fit the AMD Radeon RX 7900 XT

Gemma 3 27B Instruct	Q4_K_M · 16.5 GB · ~48 tok/s (est.)
Gemma 3 12B Instruct	Q4_K_M · 8.1 GB · ~99 tok/s (est.)
Gemma 3 4B Instruct	Q4_K_M · 3.8 GB · ~211 tok/s (est.)
Gemma 3 1B Instruct	Q4_K_M · 0.9 GB · ~400 tok/s (est.)

Buy vs. rent Gemma 3

Buy the GPU

~$899

AMD Radeon RX 7900 XT · MSRP

Rent by the hour

from $0.34/hr

RTX 4090 (24 GB) class

At 2 hrs/day, buying (~$899) beats renting at $0.34/hr after about 3.7 years.

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