internlm2 5 20b chat needs ~17.3 GB VRAM. RTX 4090 Laptop 16GB has 16.0 GB. With Q4_K_M quantization, expect ~24 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
1.3 GB over capacity — needs offload or smaller quantization
Fit status
Very compromised (needs ~0.9 GB host RAM)
Decode
23.9 tok/s
TTFT
8099 ms
Safe context
7K
Memory
17.3 GB / 16.0 GB
Offload
10%
It fits through host-memory offload, and offload is the main reason performance drops.
CPU or host-memory offload is active
About 10% of the working set spills out of accelerator memory, which usually hurts latency and sustained decode throughput.
Very little memory headroom
You can run the model, but there is not much room left for longer context, bigger batches, extra apps, or future model updates.
Remove offload with more accelerator memory
Prioritize a GPU or unified-memory tier that fits the whole model natively. Removing offload usually helps more than small compute gains.
Buy headroom, not only minimum fit
A slightly larger memory tier gives you safer context growth and makes the recommendation more future-proof.
Increase host RAM if you keep offloading
This setup may need roughly 0.9 GB of extra host RAM just for the offloaded portion, before OS and other tools.
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | C | Runs with offload (needs ~0.1 GB host RAM) | 27.7 tok/s | 3813 ms | 7K |
| Coding | D | Very compromised (needs ~0.9 GB host RAM) | 23.9 tok/s | 8099 ms | 7K |
| Agentic Coding | F | Too heavy | 18.3 tok/s | 15382 ms | 7K |
| Reasoning | D | Very compromised (needs ~0.9 GB host RAM) | 23.9 tok/s | 9571 ms | 7K |
| RAG | F | Too heavy | 18.3 tok/s | 19228 ms | 7K |
How internlm2 5 20b chat (20B params) fits at each quantization level on RTX 4090 Laptop 16GB (16.0 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 7.8 GB | Low | C51 |
Q3_K_S | 3 | 9.8 GB | Low | C51 |
NVFP4 | 4 | 11.2 GB | Medium | C50 |
Q4_K_MBest for your GPU | 4 | 12.2 GB | Medium | C50 |
Q5_K_M | 5 | 14.4 GB | High | F0 |
Q6_K | 6 | 16.4 GB | High | F0 |
Q8_0 | 8 | 21.4 GB | Very High | F0 |
F16 | 16 | 41.0 GB | Maximum | F0 |
Copy-paste commands to run internlm2 5 20b chat on your machine.
Run
lms load hf-bartowski--internlm2-5-20b-chat-gguf && lms server startUpgrade options
RTX 4000 Ada 20GBBudget pickRemoves host-memory offload, which is usually the single biggest latency and throughput win.
Adds memory headroom for longer context windows and future model growth.
~$1,250 MSRP
RTX 3090 24GBBest valueRemoves host-memory offload, which is usually the single biggest latency and throughput win.
Raises estimated decode speed by about 125%.
~$1,499 MSRP
RTX 4090 24GBNVIDIA upgradeRemoves host-memory offload, which is usually the single biggest latency and throughput win.
Raises estimated decode speed by about 163%.
~$1,599 MSRP
Yes, RTX 4090 Laptop 16GB can run internlm2 5 20b chat with a D grade (Very compromised (needs ~0.9 GB host RAM)). Expected decode speed: 23.9 tok/s.
internlm2 5 20b chat (20B parameters) requires approximately 17.3 GB of memory with Q4_K_M quantization.
The recommended quantization for internlm2 5 20b chat is Q4_K_M, which balances quality and memory efficiency.
On RTX 4090 Laptop 16GB, internlm2 5 20b chat achieves approximately 23.9 tokens per second decode speed with a time-to-first-token of 8099ms using Q4_K_M quantization.
For coding workloads, internlm2 5 20b chat on RTX 4090 Laptop 16GB receives a D grade with 23.9 tok/s and 7K context.
On RTX 4090 Laptop 16GB, internlm2 5 20b chat can safely use up to 7K tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.
Remove offload with more accelerator memory. Prioritize a GPU or unified-memory tier that fits the whole model natively. Removing offload usually helps more than small compute gains.
Paste this snippet into any page to show a live fit card.
<iframe src="https://willitrunai.com/embed/hf-bartowski--internlm2-5-20b-chat-gguf-on-rtx-4090-laptop-16gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>
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