PC Build to Run Gemma 4 31B Locally (Q4_K_M)
Autor: Jakub Rusinowski · Ostatnia aktualizacja: 31 marca 2026
A complete parts list — GPU, motherboard, RAM and PSU — worked backward from Gemma 4 31B's VRAM requirement at Q4_K_M. Prices are 2026 street estimates and vary.
Requirements
| VRAM required | ~20 GB at Q4_K_M |
| System RAM | 40 GB |
| Complete build (est.) | $1,864 |
Weights plus framework overhead only — this model publishes no architecture we can read, so no KV cache is included. A real session needs more; the figure is a floor, not a target.
lub porównaj w Vast.ai od $0.35/godz. (typical low · varies)
Jako partner Amazon zarabiamy na kwalifikujących się zakupach. Linki do chmurowych GPU są linkami polecającymi — możemy otrzymać prowizję bez dodatkowych kosztów dla Ciebie.
GPU: AMD Radeon RX 7900 XT
AMD Radeon RX 7900 XT's 20 GB covers Gemma 4 31B at Q4_K_M (~20 GB needed), a tight fit — little headroom.
Motherboard: ASUS TUF Gaming B650-PLUS WIFI
B650 (AM5) — pairs with the AMD Ryzen 7 7700; DDR5, dual PCIe 4.0 x16 (x8/x8) for multi-GPU, 4 DIMM slots to 256 GB.
RAM: Corsair Vengeance 64GB (2x32GB) DDR5-6000 C30 (AMD EXPO)
64 GB DDR5-6000 (2x32GB) meets Gemma 4 31B's 40 GB recommended system RAM.
PSU: Corsair RM650e (ATX 3.1)
650 W 80+ Gold covers AMD Radeon RX 7900 XT (315 W) + CPU 65 W with 30% headroom (~494 W required).
Swap Alternatives
- GPU: AMD Radeon RX 7900 XTX — AMD Radeon RX 7900 XTX's 24 GB covers Gemma 4 31B at Q4_K_M (~20 GB needed), with headroom.
- GPU: AMD Radeon AI PRO R9700 — AMD Radeon AI PRO R9700's 32 GB covers Gemma 4 31B at Q4_K_M (~20 GB needed), with headroom.
- RAM: Corsair Vengeance 96GB (2x48GB) DDR5-5600 C40 — More headroom: 96 GB DDR5-5600.
- PSU: Corsair RM850e (ATX 3.1) — More headroom / future dual-GPU: 850 W 80+ Gold.
- The AMD Radeon RX 7900 XT is a tight fit at Q4_K_M — consider an upgrade alternative for KV-cache/context headroom.
FAQ
What GPU do I need to run Gemma 4 31B at Q4_K_M?
AMD Radeon RX 7900 XT's 20 GB covers Gemma 4 31B at Q4_K_M (~20 GB needed), a tight fit — little headroom.
How much VRAM does Gemma 4 31B need at Q4_K_M?
About 20 GB of VRAM plus 40 GB of system RAM.
What power supply does a AMD Radeon RX 7900 XT build need?
650 W 80+ Gold covers AMD Radeon RX 7900 XT (315 W) + CPU 65 W with 30% headroom (~494 W required).
How much does a Gemma 4 31B PC cost?
About $1,864 for a complete build (GPU, motherboard, RAM, PSU, CPU, case, SSD), at 2026 street-price estimates.
Gemma 4 31B at Other Quant Levels
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← Budget-first build recommender | Gemma 4 model page | AMD Radeon RX 7900 XT review