AMD RX 6600 XT (8GB)

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The AMD RX 6600 XT (8GB) provides 8 GB of memory with 256 GB/s bandwidth, supporting local inference via ROCm and Vulkan acceleration.

Memory

8 GB

Usable Memory Ceiling

8 GB

Bandwidth

256 GB/s

Max Inference Class

8B Models (Q4)

TDP

160W

VRAM Usage vs Context Length

Simulated memory requirements as context increases. Curves crossing above the reference line will cause Out Of Memory (OOM) errors.

Precision:

FP16

Model Compatibility & Speed Matrix

Simulated inference throughput and memory feasibility across popular open-weights models.

Model	Parameters	Precision	TPS (Approx.)	TTFT
Llama 3.2 1B	1.2B	INT4	191 tok/s	~297 ms
Llama 3.2 1B	1.2B	Q8	143 tok/s	~298 ms
Llama 3.2 1B	1.2B	FP16	92 tok/s	~302 ms
Llama 3.2 3B	3.2B	INT4	110 tok/s	~731 ms
Llama 3.2 3B	3.2B	Q8	73 tok/s	~736 ms
Llama 3.2 3B	3.2B	FP16	41 tok/s	~746 ms
Mistral 7B	7.2B	INT4	61 tok/s	~1573 ms
Mistral 7B	7.2B	Q8	-	-
Mistral 7B	7.2B	FP16	-	-
Llama 3.1 8B	8.0B	INT4	56 tok/s	~1742 ms
Llama 3.1 8B	8.0B	Q8	-	-
Llama 3.1 8B	8.0B	FP16	-	-
Mistral Nemo 12B	12.2B	INT4	39 tok/s	~2636 ms
Mistral Nemo 12B	12.2B	Q8	-	-
Mistral Nemo 12B	12.2B	FP16	-	-
Qwen 2.5 14B	14.7B	INT4	-	-
DeepSeek R1 32B	32.5B	INT4	-	-
Llama 3.3 70B	70.6B	INT4	-	-
Qwen 2.5 72B	72.7B	INT4	-	-
DeepSeek V3 671B	671B (37B active)	INT4	-	-

Need custom layer dimensions, offloading configurations, or distributed multi-node topology?

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Inference Feasibility

Maximum model parameter class runnable by weight precision.

4-bit

8B Models

8-bit

< 3B Models

16-bit

FP16

< 1B Models

Fine-Tuning Feasibility

Hardware capacity for local training and adapter fine-tuning.

Context Length:

QLoRA

4-bit

8B Models

LoRA

16-bit

3B Models

Full Parameter Training

< 1B Models

Workload Recommendations

Guidance for optimal precision and operational ceilings on AMD RX 6600 XT (8GB).

Inference Sweet Spot

Recommended for lightweight models (1B to 3B) at FP16/Q8, and 7B/8B models at aggressive 4-bit quantizations.

Bandwidth & Speed Profile

With 256 GB/s aggregate bandwidth, batch size 1 inference operates in a memory-bandwidth bound regime. Generates approximately 57 tok/s on an 8B Q4 model and 7 tok/s on a 70B Q4 model.