Can Laguna XS 2.1 run on RTX 4000 Ada 20GB?

YES — With Q4_K_M

B65Good

Estimated from fit model

Laguna XS 2.1 needs ~23.9 GB VRAM. RTX 4000 Ada 20GB has 20.0 GB. With Q4_K_M quantization, expect ~21 tok/s.

Runtime: llama.cppCapacity: OffloadBandwidth: LowStack: 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.

Laguna XS 2.1 at Q4_K_M needs 25.7 GB — too much for RTX 4000 Ada 20GB (20.0 GB). Runs at Q4_K_M (23.9 GB) with medium quality. 6 quantization levels fit.

Capabilities:

Select quantization to explore

Q4_K_M (Medium quality) — 23.9 GB, 20.7 tok/s, Very compromised (needs ~3.3 GB host RAM)

23.9 GB required20.0 GB available

119% VRAM needed

3.9 GB over capacity — needs offload or smaller quantization

Fit status

Very compromised (needs ~3.3 GB host RAM)

Decode

20.7 tok/s

TTFT

9341 ms

Safe context

Memory

23.9 GB / 20.0 GB

Offload

20%

Memory breakdown

Weights20.4 GB

KV Cache0.6 GB

Runtime0.9 GB

Headroom2.0 GB

See how fast it feels

See how fast it feelsLaguna XS 2.1 on RTX 4000 Ada 20GB
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: 20.7 tok/s decode · 9.3s TTFT (warm) · 52 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 20% 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 3.3 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	F	Too heavy	18.1 tok/s	5821 ms	4K
Coding	F	Too heavy	16.4 tok/s	11822 ms	4K
Agentic Coding	F	Too heavy	13.5 tok/s	20813 ms	4K
Reasoning	F	Too heavy	16.4 tok/s	13971 ms	4K
RAG	F	Too heavy	13.5 tok/s	26016 ms	4K

Inference speed

Laguna XS 2.1 inference speed — tokens per second by GPU & Mac

Estimated decode speed (tokens/sec) for Laguna XS 2.1 at Q4_K_M across popular GPUs and Apple Silicon, using the fastest local runtime per device. Fastest is RTX 5090 32GB at ~144 tok/s. Speed is memory-bandwidth bound, so cards that fit the whole model in VRAM run far faster than ones that offload to system RAM.

GPU / Mac	Memory	Quant	Speed (tok/s)	Fits?
RTX 5090 32GB	32 GB	Q4_K_M	144.2	Fits
RTX 4090 24GB	24 GB	Q4_K_M	85.8	Offloads
Mac Studio M3 Ultra 256GB	256 GB	Q4_K_M	79.6	Fits
RX 7900 XTX 24GB	24 GB	Q4_K_M	72.3	Offloads
RTX 3090 24GB	24 GB	Q4_K_M	68.5	Offloads
Mac Studio M2 Ultra 128GB	128 GB	Q4_K_M	66.3	Fits
Mac Studio M1 Ultra 128GB	128 GB	Q4_K_M	62.9	Fits
MacBook Pro M4 Max 128GB	128 GB	Q4_K_M	49.2	Fits
MacBook Pro M4 Max 64GB	64 GB	Q4_K_M	49.2	Fits
MacBook Pro M3 Max 64GB	64 GB	Q4_K_M	37.7	Fits
MacBook Pro M1 Max 64GB	64 GB	Q4_K_M	34.6	Fits
MacBook Pro M4 Pro 48GB	48 GB	Q4_K_M	33.1	Fits
RTX 4080 Super 16GB	16 GB	Q4_K_M	31.3	Too big
RTX 4070 12GB	12 GB	Q4_K_M	10.9	Too big
RTX 3060 12GB	12 GB	Q4_K_M	6.4	Too big
RTX 4060 8GB	8 GB	Q4_K_M	4.6	Too big

Estimates for single-stream decoding at Q4_K_M; real tokens/sec varies with prompt length, context, batch size, and runtime build. Prompt processing (prefill) is faster than the decode figures shown here.

Quantization options

How Laguna XS 2.1 (33.400001525878906B params) fits at each quantization level on RTX 4000 Ada 20GB (20.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q1_0_G128	1.125	4.8 GB	Very Low	A79
Q2_0_G128	1.71	8.9 GB	Low	A83
Q2_KBest for your GPU	2	13.0 GB	Low	A82
Q3_K_S	3	16.4 GB	Low	F0
NVFP4	4	18.7 GB	Medium	F0
Q4_K_M	4	20.4 GB	Medium	F0
Q5_K_M	5	24.0 GB	High	F0
Q6_K	6	27.4 GB	High	F0
Q8_0	8	35.7 GB	Very High	F0
F16	16	68.5 GB	Maximum	F0

Get started

Copy-paste commands to run Laguna XS 2.1 on your machine.

Run

docker run --rm -it ghcr.io/ggerganov/llama.cpp:full \
  --hf-repo "poolside/Laguna-XS-2.1" \
  --hf-file "Laguna-XS-2.1-Q4_K_M.gguf" \
  -c 4096 -ngl 99

アップグレードオプション

Laguna XS 2.1を快適に動かすハードウェア

RTX 3090 24GBコスパ重視

24 GB VRAM (+4)936 GB/s (+576)

Removes host-memory offload, which is usually the single biggest latency and throughput win.68.5 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 231%.

〜$1,499 MSRP

RTX 4090 24GBコスパ最良

24 GB VRAM (+4)1008 GB/s (+648)

Removes host-memory offload, which is usually the single biggest latency and throughput win.85.8 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 314%.

〜$1,599 MSRP

RTX PRO 4000 Blackwell 24GBNVIDIAアップグレード

24 GB VRAM (+4)672 GB/s (+312)

Removes host-memory offload, which is usually the single biggest latency and throughput win.60.3 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 191%.

〜$1,599 MSRP

Frequently asked questions

Can RTX 4000 Ada 20GB run Laguna XS 2.1?

Yes, RTX 4000 Ada 20GB can run Laguna XS 2.1 at Q4_K_M quantization (Very compromised (needs ~3.3 GB host RAM)). The recommended Q4_K_M requires 25.7 GB which exceeds available memory, but at Q4_K_M it needs only 23.9 GB. Expected decode speed: 20.7 tok/s.

How much VRAM does Laguna XS 2.1 need?

Laguna XS 2.1 (33.400001525878906B parameters) requires approximately 25.7 GB at Q4_K_M quantization. On RTX 4000 Ada 20GB, it fits at Q4_K_M using 23.9 GB.

What is the best quantization for Laguna XS 2.1?

The recommended quantization is Q4_K_M, but on RTX 4000 Ada 20GB the best fitting quantization is Q4_K_M, which uses 23.9 GB.

What speed will Laguna XS 2.1 run at on RTX 4000 Ada 20GB?

On RTX 4000 Ada 20GB, Laguna XS 2.1 achieves approximately 20.7 tokens per second decode speed with a time-to-first-token of 9341ms using Q4_K_M quantization.

Can RTX 4000 Ada 20GB run Laguna XS 2.1 for coding?

For coding workloads, Laguna XS 2.1 on RTX 4000 Ada 20GB receives a F grade with 16.4 tok/s and 4K context.

What context window can Laguna XS 2.1 use on RTX 4000 Ada 20GB?

On RTX 4000 Ada 20GB, Laguna XS 2.1 can safely use up to 4K tokens of context at Q4_K_M quantization. The model's official context limit is 262K, but available memory constrains the safe maximum.

What should I upgrade first if Laguna XS 2.1 feels slow on RTX 4000 Ada 20GB?

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 4000 Ada 20GB See all hardware for Laguna XS 2.1

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