ApX logoApX logo

AMD RX 7900 XT (20GB)

The AMD RX 7900 XT (20GB) provides 20 GB of memory with 800 GB/s bandwidth, supporting local inference via ROCm and Vulkan acceleration.

Memory

20 GB

Usable Memory Ceiling

20 GB

Bandwidth

800 GB/s

Max Inference Class

14B Models (Q4)

TDP

315W

VRAM Scaling by Context Length

Estimated memory requirements as context length increases. Curves crossing above the reference line indicate Out of Memory (OOM).

DeepSeek-R1 3B (3B)Mistral-7B-Instruct-v0.1 (7.3B)Qwen3-14B (14B)Kimi Linear 48B A3B Instruct (48B (3B active))

Precision:

Best Models to Run on AMD RX 7900 XT (20GB)

Inference throughput, memory compatibility, and generation speeds for open-weights LLMs on AMD RX 7900 XT (20GB).

Sort by:

Context:

KV Cache:

GPUs:

RankModelParametersPrecisionTPS (Approx.)TTFTCan Run

#48

Qwen 3.8 27B

27B

INT4

38 tok/s

~3.3s

#83

K2 Horizon MoVA 36B A4B

36B (4B active)

INT4

114 tok/s

~757 ms

#93

Qwen3.5-27B

27B

INT4

38 tok/s

~3.3s

#105

Sarvam-30B

32B (2.4B active)

INT4

144 tok/s

~490 ms

#106

Qwen3.6 35B A3B

35B (3B active)

INT4

127 tok/s

~617 ms

#110

Muse Glimmer 30B

30B

INT4

33 tok/s

~3.9s

#111

MiMo V2 Flash

15B (309B active)

INT4

4 tok/s

~35.6s

#112

Phi-4 Reasoning Plus

14B

INT4
Q8

49 tok/s

32 tok/s

~1.7s

~1.9s

#117

Gemma 4 26B A4B

25.2B (3.8B active)

INT4

133 tok/s

~590 ms

#125

Qwen3.5-9B

9B

INT4
Q8
FP16

89 tok/s

58 tok/s

30 tok/s

~1.1s

~1.1s

~1.3s

#126

Qwen3.5-35B-A3B

35B (3B active)

INT4

127 tok/s

~617 ms

#128

K2 Horizon 7B

7B

INT4
Q8
FP16

105 tok/s

70 tok/s

41 tok/s

~875 ms

~880 ms

~890 ms

#135

Gemma 4 12B

11.95B

INT4
Q8

55 tok/s

37 tok/s

~1.5s

~1.6s

#140

Qwen3.5-4B

4B

INT4
Q8
FP16

142 tok/s

103 tok/s

64 tok/s

~516 ms

~519 ms

~525 ms

#143

GPT-OSS 20B

21B (3.6B active)

INT4

70 tok/s

~606 ms

#144

GLM-4V

9B

INT4
Q8

68 tok/s

49 tok/s

~1.1s

~1.1s

#150

NVIDIA Nemotron 3 Nano 30B-A3B

3.5B (30B active)

INT4
Q8
FP16

33 tok/s

20 tok/s

11 tok/s

~3.5s

~3.5s

~3.6s

#153

Qwen3-30B-A3B

30B (3B active)

INT4

135 tok/s

~559 ms

#158

Granite 4.2 8B

8B

INT4
Q8
FP16

97 tok/s

64 tok/s

35 tok/s

~995 ms

~1.0s

~1.1s

#159

Gemma 4 E4B

8B

INT4
Q8
FP16

97 tok/s

64 tok/s

35 tok/s

~995 ms

~1.0s

~1.1s

Inference Capacity

Maximum model parameter class runnable by weight precision.

Context:

4-bit

Q4

14B Models

8-bit

Q8

14B Models

16-bit

FP16

8B Models

Fine-Tuning Capacity

Hardware capacity for local training and adapter fine-tuning.

Context Length:

QLoRA

4-bit

32B Models

LoRA

16-bit

8B Models

Full Parameter Training

1B Models

Workload Recommendations

Guidance for optimal precision and operational ceilings on AMD RX 7900 XT (20GB).

Inference Sweet Spot

Optimized for 14B models at uncompressed or Q8 precision, and 32B models at Q4 with up to 32k context.

Bandwidth & Speed Profile

With 800 GB/s aggregate bandwidth, batch size 1 inference operates in a memory-bandwidth bound regime. Generates approximately 178 tok/s on an 8B Q4 model and 21 tok/s on a 70B Q4 model.

Frequently Asked Questions