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URL: https://willitrunai.com/can-run/hf-unsloth--gemma-3-27b-it-gguf-on-rx-7900-xt-20gb

⇱ Can gemma 3 27b it Run on RX 7900 XT 20GB? YES (22.5/20.0GB)

Can gemma 3 27b it run on RX 7900 XT 20GB?

BARELY — Tight on Memory

D39Poor
○Estimated from fit model

gemma 3 27b it needs ~22.5 GB VRAM. RX 7900 XT 20GB has 20.0 GB. With Q4_K_M quantization, expect ~17 tok/s.

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

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

Q4_K_M (Medium quality) — 22.5 GB, 17.0 tok/s, Very compromised (needs ~1.9 GB host RAM)
22.5 GB required20.0 GB available
113% VRAM needed

2.5 GB over capacity — needs offload or smaller quantization

Fit status

Very compromised (needs ~1.9 GB host RAM)

Decode

17.0 tok/s

TTFT

11386 ms

Safe context

4K

Memory

22.5 GB / 20.0 GB

Offload

10%

Memory breakdown

Weights16.5 GB
KV Cache3.2 GB
Runtime0.9 GB
Headroom2.0 GB

See how fast it feels

See how fast it feelsgemma 3 27b it on RX 7900 XT 20GB
1st promptCold start — includes initialization
>What is local AI inference?
Local AI inference means running an AI language model directly on your own hardware — your laptop, desktop, or server — instead of sending requests to a remote cloud API. When you run inference locally the model weights are loaded into your GPU or unified memory. Each token you generate requires reading those weights from memory, so memory bandwidth is the main bottleneck for decode speed. Key benefits of running locally: - Full privacy: your prompts never leave your machine - No per-token cost or rate limits - Works offline once the model is downloaded - Latency depends only on your hardware
2nd promptWarm — model ready, no init overhead
>How much VRAM do I need?
It depends on the model size and quantization level. A rough rule of thumb: Model size Q4 (4-bit) Q8 (8-bit) FP16 7B params ~4.3 GB ~7.5 GB ~14 GB 13B params ~7.9 GB ~13.9 GB ~26 GB 70B params ~42.7 GB ~74.9 GB ~140 GB Most people use 4-bit quantization (Q4_K_M) which gives 90-95% of full quality at a fraction of the memory. A 24 GB GPU can comfortably run most 7B-13B models.
Estimated: 17.0 tok/s decode · 11.4s TTFT (warm) · 43 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

WorkloadGradeFitDecodeTTFTContext
ChatCRuns with offload (needs ~0.7 GB host RAM)19.8 tok/s5328 ms4K
CodingDVery compromised (needs ~1.9 GB host RAM)17.0 tok/s11386 ms4K
Agentic CodingFToo heavy12.9 tok/s21837 ms4K
ReasoningDVery compromised (needs ~1.9 GB host RAM)17.0 tok/s13456 ms4K
RAGFToo heavy12.9 tok/s27297 ms4K

Quantization options

How gemma 3 27b it (27B params) fits at each quantization level on RX 7900 XT 20GB (20.0 GB usable).

QuantBitsVRAMQualityFit
Q2_K
2
10.5 GB
LowC51
Q3_K_S
3
13.2 GB
LowC50
NVFP4Best for your GPU
4
15.1 GB
MediumC50
Q4_K_M
4
16.5 GB
MediumF0
Q5_K_M
5
19.4 GB
HighF0
Q6_K
6
22.1 GB
HighF0
Q8_0
8
28.9 GB
Very HighF0
F16
16
55.4 GB
MaximumF0

Get started

Copy-paste commands to run gemma 3 27b it on your machine.

Run

lms load hf-unsloth--gemma-3-27b-it-gguf && lms server start

Upgrade options

Hardware that runs gemma 3 27b it well

RX 7900 XTX 24GBBudget pick
24 GB VRAM (+4)960 GB/s (+160)
C
Removes host-memory offload, which is usually the single biggest latency and throughput win.42 tok/s decode

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

Raises estimated decode speed by about 147%.

~$999 MSRP

Radeon AI PRO R9700 32GBBest value
32 GB VRAM (+12)
C
Removes host-memory offload, which is usually the single biggest latency and throughput win.22.9 tok/s decode

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

Raises estimated decode speed by about 35%.

~$1,899 MSRP

Radeon Pro W6800 32GBAMD upgrade
32 GB VRAM (+12)
C
Removes host-memory offload, which is usually the single biggest latency and throughput win.17.4 tok/s decode

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

Adds memory headroom for longer context windows and future model growth.

~$2,249 MSRP

Frequently asked questions

See all results for RX 7900 XT 20GBSee all hardware for gemma 3 27b it