MPT-30B-Instruct needs ~47.4 GB but RTX 3080 12GB only has 12.0 GB. Try a smaller quantization or lighter model.
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
35.4 GB over capacity — needs offload or smaller quantization
Fit status
Too heavy
Decode
4.9 tok/s
TTFT
39433 ms
Safe context
4K
Memory
47.4 GB / 12.0 GB
Offload
70%
Usable VRAM is the main blocker for this model.
Not enough usable memory
The model needs 47.4 GB, but this setup only exposes 12.0 GB of usable VRAM.
Add more VRAM headroom
The first useful upgrade is more dedicated VRAM so you can fit the model without shrinking context or dropping to a much lower quant.
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | F | Too heavy | 4.9 tok/s | 21509 ms | 4K |
| Coding | F | Too heavy | 4.9 tok/s | 39433 ms | 4K |
| Agentic Coding | F | Too heavy | 4.9 tok/s | 57357 ms | 4K |
| Reasoning | F | Too heavy | 4.9 tok/s | 46603 ms | 4K |
| RAG | F | Too heavy | 4.9 tok/s | 71696 ms | 4K |
How MPT-30B-Instruct (30B params) fits at each quantization level on RTX 3080 12GB (12.0 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 11.7 GB | Low | F0 |
Q3_K_S | 3 | 14.7 GB | Low | F0 |
NVFP4 | 4 |
Upgrade options
RTX A6000 48GBBudget pickMakes the model fit on the accelerator instead of staying completely out of reach.
Raises estimated decode speed by about 271%.
~$4,650 MSRP
RTX PRO 5000 Blackwell 48GBBest valueMakes the model fit on the accelerator instead of staying completely out of reach.
Raises estimated decode speed by about 635%.
~$4,999 MSRP
Quadro RTX 8000 48GBNVIDIA upgradeMakes the model fit on the accelerator instead of staying completely out of reach.
Raises estimated decode speed by about 186%.
~$5,800 MSRP
NVIDIA H100 80GBBiggest leapMakes the model fit on the accelerator instead of staying completely out of reach.
Removes host-memory offload, which is usually the single biggest latency and throughput win.
~$40,000 MSRP
No, MPT-30B-Instruct requires more memory than RTX 3080 12GB provides.
MPT-30B-Instruct (30B parameters) requires approximately 47.4 GB of memory with Q5_K_M quantization.
The recommended quantization for MPT-30B-Instruct is Q5_K_M, which balances quality and memory efficiency.
On RTX 3080 12GB, MPT-30B-Instruct achieves approximately 4.9 tokens per second decode speed with a time-to-first-token of 39433ms using Q5_K_M quantization.
For coding workloads, MPT-30B-Instruct on RTX 3080 12GB receives a F grade with 4.9 tok/s and 4K context.
On RTX 3080 12GB, MPT-30B-Instruct can safely use up to 4K tokens of context. The model's official context limit is 8K, 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/mpt-30b-instruct-on-rtx-3080-12gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>
Preview:
| Medium |
| F0 |
Q4_K_M | 4 | 18.3 GB | Medium | F0 |
Q5_K_M | 5 | 21.6 GB | High | F0 |
Q6_K | 6 | 24.6 GB | High | F0 |
Q8_0 | 8 | 32.1 GB | Very High | F0 |
F16 | 16 | 61.5 GB | Maximum | F0 |
Add more VRAM headroom. The first useful upgrade is more dedicated VRAM so you can fit the model without shrinking context or dropping to a much lower quant.
