Can Gemma 4 12B run on Radeon RX 7800M 12GB?

YES — With Q3_K_S

A70Great

Estimated from fit model

Gemma 4 12B needs ~13.8 GB VRAM. Radeon RX 7800M 12GB has 12.0 GB. With Q3_K_S quantization, expect ~18 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.

Gemma 4 12B at Q4_K_M needs 15.3 GB — too much for Radeon RX 7800M 12GB (12.0 GB). Runs at Q3_K_S (13.8 GB) with low quality. 2 quantization levels fit.

Capabilities:

Select quantization to explore

Q4_K_M (Medium quality) — 15.3 GB, exceeds 12.0 GB available

15.3 GB required12.0 GB available

128% VRAM needed

3.3 GB over capacity — needs offload or smaller quantization

Fit status

Too heavy

Decode

12.5 tok/s

TTFT

15492 ms

Safe context

Memory

15.3 GB / 12.0 GB

Offload

20%

Memory breakdown

Weights7.3 GB

KV Cache5.9 GB

Runtime0.9 GB

Headroom1.2 GB

See how fast it feels

With memory offload — actual speed may be lower

See how fast it feelsGemma 4 12B on Radeon RX 7800M 12GB
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: 12.5 tok/s decode · 15.5s TTFT (warm) · 31 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 0.8 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	A	Runs with offload (needs ~0.2 GB host RAM)	19.6 tok/s	5398 ms	7K
Coding	F	Too heavy	12.5 tok/s	15492 ms	7K
Agentic Coding	F	Too heavy	6.3 tok/s	44626 ms	7K
Reasoning	F	Too heavy	12.5 tok/s	18309 ms	7K
RAG	F	Too heavy	6.3 tok/s	55782 ms	7K

Inference speed

Gemma 4 12B inference speed — tokens per second by GPU & Mac

Estimated decode speed (tokens/sec) for Gemma 4 12B at Q4_K_M across popular GPUs and Apple Silicon, using the fastest local runtime per device. Fastest is RTX 5090 32GB at ~168 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	168.0	Fits
RTX 4090 24GB	24 GB	Q4_K_M	109.9	Fits
RX 7900 XTX 24GB	24 GB	Q4_K_M	99.1	Fits
RTX 3090 24GB	24 GB	Q4_K_M	94.0	Fits
RTX 4080 Super 16GB	16 GB	Q4_K_M	87.6	Offloads
Mac Studio M3 Ultra 256GB	256 GB	Q4_K_M	60.5	Fits
Mac Studio M2 Ultra 128GB	128 GB	Q4_K_M	50.4	Fits
Mac Studio M1 Ultra 128GB	128 GB	Q4_K_M	47.8	Fits
MacBook Pro M4 Max 64GB	64 GB	Q4_K_M	43.4	Fits
MacBook Pro M3 Max 64GB	64 GB	Q4_K_M	34.4	Fits
MacBook Pro M4 Max 128GB	128 GB	Q4_K_M	32.9	Fits
MacBook Pro M1 Max 64GB	64 GB	Q4_K_M	31.6	Fits
MacBook Pro M4 Pro 48GB	48 GB	Q4_K_M	26.5	Fits
RTX 4070 12GB	12 GB	Q4_K_M	23.5	Too big
RTX 3060 12GB	12 GB	Q4_K_M	14.8	Too big
RTX 4060 8GB	8 GB	Q4_K_M	5.5	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 Gemma 4 12B (12B params) fits at each quantization level on Radeon RX 7800M 12GB (12.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	4.7 GB	Low	A83
Q3_K_S	3	5.9 GB	Low	A84
NVFP4	4	6.7 GB	Medium	A83
Q4_K_M	4	7.3 GB	Medium	A83
Q5_K_MBest for your GPU	5	8.6 GB	High	A83
Q6_K	6	9.8 GB	High	F0
Q8_0	8	12.8 GB	Very High	F0
F16	16	24.6 GB	Maximum	F0

Get started

Copy-paste commands to run Gemma 4 12B on your machine.

Run

lms load gemma-4-12B-it && lms server start

Opciones de mejora

Hardware que ejecuta bien Gemma 4 12B

RX 7600 XT 16GBOpción económica

16 GB VRAM (+4)

Hace que el modelo quepa en el acelerador en lugar de seguir fuera de alcance.18.2 tok/s decodificación

Hace que el modelo quepa en el acelerador en lugar de seguir fuera de alcance.

Elimina el offload a memoria del sistema, que suele ser la mayor mejora individual en latencia y throughput.

~$329 MSRP

RX 9060 XT 16GBMejor relación calidad-precio

16 GB VRAM (+4)

Hace que el modelo quepa en el acelerador en lugar de seguir fuera de alcance.21.9 tok/s decodificación

Hace que el modelo quepa en el acelerador en lugar de seguir fuera de alcance.

Elimina el offload a memoria del sistema, que suele ser la mayor mejora individual en latencia y throughput.

~$349 MSRP

RX 9070 16GBMejora AMD

16 GB VRAM (+4)640 GB/s (+208)

Hace que el modelo quepa en el acelerador en lugar de seguir fuera de alcance.43.1 tok/s decodificación

Hace que el modelo quepa en el acelerador en lugar de seguir fuera de alcance.

Elimina el offload a memoria del sistema, que suele ser la mayor mejora individual en latencia y throughput.

~$479 MSRP

Frequently asked questions

Can Radeon RX 7800M 12GB run Gemma 4 12B?

Yes, Radeon RX 7800M 12GB can run Gemma 4 12B at Q3_K_S quantization (Very compromised (needs ~0.8 GB host RAM)). The recommended Q4_K_M requires 15.3 GB which exceeds available memory, but at Q3_K_S it needs only 13.8 GB. Expected decode speed: 17.8 tok/s.

How much VRAM does Gemma 4 12B need?

Gemma 4 12B (12B parameters) requires approximately 15.3 GB at Q4_K_M quantization. On Radeon RX 7800M 12GB, it fits at Q3_K_S using 13.8 GB.

What is the best quantization for Gemma 4 12B?

The recommended quantization is Q4_K_M, but on Radeon RX 7800M 12GB the best fitting quantization is Q3_K_S, which uses 13.8 GB.

What speed will Gemma 4 12B run at on Radeon RX 7800M 12GB?

On Radeon RX 7800M 12GB, Gemma 4 12B achieves approximately 17.8 tokens per second decode speed with a time-to-first-token of 10864ms using Q3_K_S quantization.

Can Radeon RX 7800M 12GB run Gemma 4 12B for coding?

For coding workloads, Gemma 4 12B on Radeon RX 7800M 12GB receives a F grade with 12.5 tok/s and 7K context.

What context window can Gemma 4 12B use on Radeon RX 7800M 12GB?

On Radeon RX 7800M 12GB, Gemma 4 12B can safely use up to 11K tokens of context at Q3_K_S quantization. The model's official context limit is 262K, but available memory constrains the safe maximum.

What should I upgrade first if Gemma 4 12B feels slow on Radeon RX 7800M 12GB?

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 Radeon RX 7800M 12GB See all hardware for Gemma 4 12B

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