PC Build to Run Gemma 3 12B Instruct Locally (Q5_K_M)

Written by Jakub Rusinowski · Last updated July 10, 2026

A complete parts list — GPU, motherboard, RAM and PSU — worked backward from Gemma 3 12B Instruct's VRAM requirement at Q5_K_M. Prices are 2026 street estimates and vary.

Requirements

GPU: AMD Radeon RX 9060 XT 16GB

AMD Radeon RX 9060 XT 16GB's 16 GB covers Gemma 3 12B Instruct at Q5_K_M (~12 GB needed), with headroom.

Check price on Amazon — AMD Radeon RX 9060 XT 16GB

Motherboard: MSI MAG B550 Tomahawk

B550 (AM4) — pairs with the AMD Ryzen 5 5600; DDR4, dual PCIe 4.0 x16 (x8/x8) for multi-GPU, 4 DIMM slots to 128 GB.

Check price on Amazon — MSI MAG B550 Tomahawk

RAM: Corsair Vengeance LPX 32GB (2x16GB) DDR4-3600 C18 PREVIEW

32 GB DDR4-3600 (2x16GB) meets Gemma 3 12B Instruct's 32 GB recommended system RAM.

Check price on Amazon — 32GB DDR4-3200 Kit (2x16GB)

PSU: Corsair RM650e (ATX 3.1)

650 W 80+ Gold covers AMD Radeon RX 9060 XT 16GB (160 W) + CPU 65 W with 30% headroom (~293 W required).

Check price on Amazon — Corsair RM650e (ATX 3.1)

Swap Alternatives

• GPU: AMD Radeon RX 7900 XT — AMD Radeon RX 7900 XT's 20 GB covers Gemma 3 12B Instruct at Q5_K_M (~12 GB needed), with headroom.
• GPU: AMD Radeon RX 7900 XTX — AMD Radeon RX 7900 XTX's 24 GB covers Gemma 3 12B Instruct at Q5_K_M (~12 GB needed), with headroom.
• PSU: Corsair RM850e (ATX 3.1) — More headroom / future dual-GPU: 850 W 80+ Gold.

• Some component specs are marked "preview" (pending a second independent source) — see the badges.

FAQ

What GPU do I need to run Gemma 3 12B Instruct at Q5_K_M?

AMD Radeon RX 9060 XT 16GB's 16 GB covers Gemma 3 12B Instruct at Q5_K_M (~12 GB needed), with headroom.

How much VRAM does Gemma 3 12B Instruct need at Q5_K_M?

About 12 GB of VRAM plus 32 GB of system RAM.

What power supply does a AMD Radeon RX 9060 XT 16GB build need?

650 W 80+ Gold covers AMD Radeon RX 9060 XT 16GB (160 W) + CPU 65 W with 30% headroom (~293 W required).

How much does a Gemma 3 12B Instruct PC cost?

About $979 for a complete build (GPU, motherboard, RAM, PSU, CPU, case, SSD), at 2026 street-price estimates.

Gemma 3 12B Instruct at Other Quant Levels

• Gemma 3 12B Instruct at Q4_K_M
• Gemma 3 12B Instruct at Q8_0

Other Popular Build Targets

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Model & GPU

• Gemma 3 model page
• AMD Radeon RX 9060 XT 16GB review
• Can I run Gemma 3 on AMD Radeon RX 9060 XT 16GB?

More Ways to Build

• Budget-first build recommender
• Best GPU Buyer Guide 2026

← Budget-first build recommender | Gemma 3 model page | AMD Radeon RX 9060 XT 16GB review