Can InternLM 20B run on RTX PRO 4500 Blackwell 32GB?

BARELY — Tight on Memory

C48Usable

Estimated from fit model

InternLM 20B needs ~36.8 GB VRAM. RTX PRO 4500 Blackwell 32GB has 32.0 GB. With Q5_K_M quantization, expect ~31 tok/s.

Runtime: llama.cppCapacity: OffloadBandwidth: HighStack: StandardBottleneck: Host offload

Operating mode

Choose the run profile you care about

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.

Capabilities:

Select quantization to explore

Q5_K_M (High quality) — 36.8 GB, 30.6 tok/s, Very compromised (needs ~1.9 GB host RAM)

36.8 GB required32.0 GB available

115% VRAM needed

4.8 GB over capacity — needs offload or smaller quantization

Fit status

Very compromised (needs ~1.9 GB host RAM)

Decode

30.6 tok/s

TTFT

6319 ms

Safe context

Memory

36.8 GB / 32.0 GB

Offload

10%

Memory breakdown

Weights14.4 GB

KV Cache18.3 GB

Runtime0.9 GB

Headroom3.2 GB

See how fast it feels

See how fast it feelsInternLM 20B on RTX PRO 4500 Blackwell 32GB
1st promptCold start — includes initialization
>Write a Python function to sort a list
Here's a Python function that sorts a list using quicksort:

def quicksort(arr):
    if len(arr) <= 1:
        return arr
    pivot = arr[len(arr) // 2]
    left   = [x for x in arr if x < pivot]
    middle = [x for x in arr if x == pivot]
    right  = [x for x in arr if x > pivot]
    return quicksort(left) + middle + quicksort(right)

# Example usage
numbers = [3, 6, 8, 10, 1, 2, 1]
print(quicksort(numbers))  # [1, 1, 2, 3, 6, 8, 10]

The algorithm picks a pivot, partitions the list into smaller, equal, and larger elements, then recursively sorts each partition and concatenates the results.
2nd promptWarm — model ready, no init overhead
>Now add type hints and a docstring
def quicksort(arr: list[int]) -> list[int]:
    """Sort a list using the quicksort algorithm.

    Args:
        arr: List of integers to sort.

    Returns:
        A new sorted list.
    """
    if len(arr) <= 1:
        return arr
    pivot = arr[len(arr) // 2]
    left   = [x for x in arr if x < pivot]
    middle = [x for x in arr if x == pivot]
    right  = [x for x in arr if x > pivot]
    return quicksort(left) + middle + quicksort(right)

Added type hints for the input and return type, plus a Google-style docstring.
Estimated: 30.6 tok/s decode · 6.3s TTFT (warm) · 77 tok/s prefill

What limits this setup

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.

Best improvement path

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 1.9 GB of extra host RAM just for the offloaded portion, before OS and other tools.

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	B	Tight fit	53.3 tok/s	1981 ms	8K
Coding	C	Very compromised (needs ~1.9 GB host RAM)	30.6 tok/s	6319 ms	8K
Agentic Coding	F	Too heavy	13.4 tok/s	20946 ms	8K
Reasoning	C	Very compromised (needs ~1.9 GB host RAM)	30.6 tok/s	7468 ms	8K
RAG	F	Too heavy	13.4 tok/s	26182 ms	8K

Quantization options

How InternLM 20B (20B params) fits at each quantization level on RTX PRO 4500 Blackwell 32GB (32.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	7.8 GB	Low	C53
Q3_K_S	3	9.8 GB	Low	C54
NVFP4	4	11.2 GB	Medium	C54
Q4_K_M	4	12.2 GB	Medium	C55
Q5_K_M	5	14.4 GB	High	B56
Q6_K	6	16.4 GB	High	B57
Q8_0Best for your GPU	8	21.4 GB	Very High	B57
F16	16	41.0 GB	Maximum	F0

Get started

Copy-paste commands to run InternLM 20B on your machine.

Run

docker run --rm -it ghcr.io/ggerganov/llama.cpp:full \
  --hf-repo "internlm/internlm2_5-20b-chat" \
  --hf-file "internlm2_5-20b-chat-Q5_K_M.gguf" \
  -c 4096 -ngl 99

アップグレードオプション

InternLM 20Bを快適に動かすハードウェア

RTX A6000 48GBコスパ重視

48 GB VRAM (+16)

Removes host-memory offload, which is usually the single biggest latency and throughput win.41.3 tok/sデコード

Removes host-memory offload, which is usually the single biggest latency and throughput win.

Raises estimated decode speed by about 35%.

〜$4,650 MSRP

RTX PRO 5000 Blackwell 48GBコスパ最良

48 GB VRAM (+16)1344 GB/s (+448)

Removes host-memory offload, which is usually the single biggest latency and throughput win.80 tok/sデコード

Removes host-memory offload, which is usually the single biggest latency and throughput win.

Raises estimated decode speed by about 161%.

〜$4,999 MSRP

NVIDIA L40 48GBNVIDIAアップグレード

48 GB VRAM (+16)

Removes host-memory offload, which is usually the single biggest latency and throughput win.38.7 tok/sデコード

Removes host-memory offload, which is usually the single biggest latency and throughput win.

Raises estimated decode speed by about 26%.

〜$5,500 MSRP

Frequently asked questions

Can RTX PRO 4500 Blackwell 32GB run InternLM 20B?

Yes, RTX PRO 4500 Blackwell 32GB can run InternLM 20B with a C grade (Very compromised (needs ~1.9 GB host RAM)). Expected decode speed: 30.6 tok/s.

How much VRAM does InternLM 20B need?

InternLM 20B (20B parameters) requires approximately 36.8 GB of memory with Q5_K_M quantization.

What is the best quantization for InternLM 20B?

The recommended quantization for InternLM 20B is Q5_K_M, which balances quality and memory efficiency.

What speed will InternLM 20B run at on RTX PRO 4500 Blackwell 32GB?

On RTX PRO 4500 Blackwell 32GB, InternLM 20B achieves approximately 30.6 tokens per second decode speed with a time-to-first-token of 6319ms using Q5_K_M quantization.

Can RTX PRO 4500 Blackwell 32GB run InternLM 20B for coding?

For coding workloads, InternLM 20B on RTX PRO 4500 Blackwell 32GB receives a C grade with 30.6 tok/s and 8K context.

What context window can InternLM 20B use on RTX PRO 4500 Blackwell 32GB?

On RTX PRO 4500 Blackwell 32GB, InternLM 20B can safely use up to 8K tokens of context. The model's official context limit is 8K, but available memory constrains the safe maximum.

What should I upgrade first if InternLM 20B feels slow on RTX PRO 4500 Blackwell 32GB?

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.

See all results for RTX PRO 4500 Blackwell 32GB See all hardware for InternLM 20B

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