Gemma 3 12B needs ~14.7 GB VRAM. RX 7800 XT 16GB has 16.0 GB. With Q4_K_M quantization, expect ~40 tok/s.
Operating mode
Interactive favors responsiveness, while light API and scale-out lean harder on serving readiness. The fit stays the same, but the recommendation lens changes.
Current mode
Balanced
Balanced for general local use. Keeps the ranking neutral across personal and serving workflows.
Select quantization to explore
Fit status
Tight fit
Decode
42.1 tok/s
TTFT
4603 ms
Safe context
20K
Memory
14.7 GB / 16.0 GB
This setup is broadly balanced for this model.
No major red flags
This recommendation has enough memory headroom and acceptable estimated speed for the selected workload.
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | A | Runs well | 42.1 tok/s | 2511 ms | 20K |
| Coding | A | Tight fit | 40.1 tok/s | 4833 ms | 20K |
| Agentic Coding | F | Too heavy | 20.6 tok/s | 13664 ms | 20K |
| Reasoning | A | Tight fit | 42.1 tok/s | 5440 ms | 20K |
| RAG | F | Too heavy | 20.6 tok/s | 17080 ms | 20K |
How Gemma 3 12B (12B params) fits at each quantization level on RX 7800 XT 16GB (16.0 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 4.7 GB | Low | A78 |
Q3_K_S | 3 | 5.9 GB | Low | A79 |
NVFP4 | 4 |
Copy-paste commands to run Gemma 3 12B on your machine.
Run
ollama run gemma3:12bYour hardware
| Model | Params | Grade | Decode | Capabilities |
|---|---|---|---|---|
| 14B | S | 48.9 tok/s | ||
| 14.7B | S | 46.4 tok/s |
Yes, RX 7800 XT 16GB can run Gemma 3 12B with a A grade (Tight fit). Expected decode speed: 40.1 tok/s.
Gemma 3 12B (12B parameters) requires approximately 14.7 GB of memory with Q4_K_M quantization.
The recommended quantization for Gemma 3 12B is Q4_K_M, which balances quality and memory efficiency.
On RX 7800 XT 16GB, Gemma 3 12B achieves approximately 40.1 tokens per second decode speed with a time-to-first-token of 4833ms using Q4_K_M quantization.
For coding workloads, Gemma 3 12B on RX 7800 XT 16GB receives a A grade with 40.1 tok/s and 20K context.
On RX 7800 XT 16GB, Gemma 3 12B can safely use up to 20K tokens of context. The model's official context limit is 131K, but available memory constrains the safe maximum.
Paste this snippet into any page to show a live fit card.
<iframe src="https://willitrunai.com/embed/gemma-3-12b-on-rx-7800-xt-16gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>
Preview:
6.7 GB |
| Medium |
| A80 |
Q4_K_M | 4 | 7.3 GB | Medium | A81 |
Q5_K_M | 5 | 8.6 GB | High | A81 |
Q6_KBest for your GPU | 6 | 9.8 GB | High | A81 |
Q8_0 | 8 | 12.8 GB | Very High | F0 |
F16 | 16 | 24.6 GB | Maximum | F0 |
| 21B | A | 44.8 tok/s |
| 14B | S | 48.7 tok/s |
| 22B | A | 16.4 tok/s |