PC Build to Run Gemma 4 31B Locally (Q8_0)
Written by Jakub Rusinowski · Last updated March 31, 2026
A complete parts list — GPU, motherboard, RAM and PSU — worked backward from Gemma 4 31B's VRAM requirement at Q8_0. Prices are 2026 street estimates and vary.
Requirements
| VRAM required | ~34 GB at Q8_0 |
| System RAM | 40 GB |
| Complete build (est.) | $3,418 |
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GPU: 2× AMD Radeon RX 7900 XT
2× AMD Radeon RX 7900 XT (40 GB pooled) covers Gemma 4 31B at Q8_0 (~34 GB needed), with headroom.
AMD Radeon RX 7900 XT 20GB
20 GB VRAM · 315 W board power
2026 prices are volatile — check the current listing.
Motherboard: ASUS ProArt X670E-Creator WIFI
X670E (AM5) — pairs with the AMD Ryzen 9 7900X; DDR5, dual PCIe 5.0 x16 (x8/x8) for multi-GPU, 4 DIMM slots to 192 GB.
ASUS ProArt X670E-Creator WIFI
2026 prices are volatile — check the current listing.
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.
64GB DDR5-5200 Kit (2x32GB)
2026 prices are volatile — check the current listing.
PSU: Corsair HX1500i (ATX 3.1)
1500 W 80+ Platinum covers 2× AMD Radeon RX 7900 XT (630 W) + CPU 170 W with 30% headroom (~1040 W required).
Corsair HX1500i (ATX 3.1)
2026 prices are volatile — check the current listing.
Swap Alternatives
- GPU: NVIDIA RTX 6000 Ada Generation — Single-GPU alternative (no tensor split, simpler): NVIDIA RTX 6000 Ada Generation 48 GB at $6,799.
- RAM: Corsair Vengeance 96GB (2x48GB) DDR5-5600 C40 — More headroom: 96 GB DDR5-5600.
- Gemma 4 31B at Q8_0 needs more VRAM than any single consumer GPU, so this uses 2× AMD Radeon RX 7900 XT (40 GB pooled via tensor split) — cheaper than the single NVIDIA RTX 6000 Ada Generation (48 GB, $6,799) that would also fit.
FAQ
What GPU do I need to run Gemma 4 31B at Q8_0?
2× AMD Radeon RX 7900 XT (40 GB pooled) covers Gemma 4 31B at Q8_0 (~34 GB needed), with headroom.
How much VRAM does Gemma 4 31B need at Q8_0?
About 34 GB of VRAM plus 40 GB of system RAM.
What power supply does a AMD Radeon RX 7900 XT build need?
1500 W 80+ Platinum covers 2× AMD Radeon RX 7900 XT (630 W) + CPU 170 W with 30% headroom (~1040 W required).
How much does a Gemma 4 31B PC cost?
About $3,418 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