RX 7700 XT 12GB vs T4 16GB for Local LLMs

The RX 7700 XT 12GB has about 35% more memory bandwidth (432 vs 320 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 35% faster on the RX 7700 XT 12GB. The T4 16GB fits more of the catalog at Q4/8K — 25 vs 18 of 61 models (16 vs 12 GB VRAM). Largest model that fits the T4 16GB but not the RX 7700 XT 12GB: gpt-oss-20b (21.5B). MSRP is $449 for the RX 7700 XT 12GB vs $2,000 for the T4 16GB. MSRP is a launch list price, not live retail — Amazon prices move; click through for the current price. In the Q4/8K head-to-head below (40 shared models), the RX 7700 XT 12GB posts the higher tok/s in 25 rows vs 15. Methodology.

Spec comparison

	RX 7700 XT 12GB	T4 16GB
Vendor	AMD	NVIDIA
VRAM	12 GB	16 GB
Memory type	GDDR6	GDDR6
Memory bandwidth	432 GB/s	320 GB/s
TDP	245 W	70 W
MSRP (list)	$449	$2,000
Buy	Search Amazon (affiliate)	Search Amazon (affiliate)

MSRP is the launch list price, not live retail. Buy links are Amazon affiliate links — the price after you click is the live price.

Q4 / 8K head-to-head — top 15 of 40 shared models

Model	Params (B)	RX 7700 XT 12GB tok/s	RX 7700 XT 12GB fits	T4 16GB tok/s	T4 16GB fits	Winner
Qwen3-0.6B	0.8	343.6 est.	Yes	254.5 est.	Yes	RX 7700 XT 12GB
gemma-3-1b-it	1.0	274.9 est.	Yes	203.6 est.	Yes	RX 7700 XT 12GB
Llama-3.2-1B-Instruct	1.2	229.1 est.	Yes	169.7 est.	Yes	RX 7700 XT 12GB
gpt-oss-20b	21.5	171.1 est.	No	56.6 est.	Yes	RX 7700 XT 12GB
Qwen3-30B-A3B	30.5	111.6 est.	No	147.0 est.	No	T4 16GB
Qwen3-Coder-30B-A3B-Instruct	30.5	111.6 est.	No	147.0 est.	No	T4 16GB
Qwen3-30B-A3B-Instruct-2507	30.5	111.6 est.	No	147.0 est.	No	T4 16GB
GLM-4.7-Flash	31.2	107.1 est.	No	141.1 est.	No	T4 16GB
Qwen3-1.7B	2.0	137.5 est.	Yes	101.8 est.	Yes	RX 7700 XT 12GB
Llama-3.2-3B-Instruct	3.2	85.9 est.	Yes	63.6 est.	Yes	RX 7700 XT 12GB
Phi-4-mini-instruct	3.8	72.3 est.	Yes	53.6 est.	Yes	RX 7700 XT 12GB
Phi-4-mini-reasoning	3.8	72.3 est.	Yes	53.6 est.	Yes	RX 7700 XT 12GB
gemma-3-4b-it	4.3	70.5 est.	Yes	52.2 est.	Yes	RX 7700 XT 12GB
Qwen3-4B-Instruct-2507	4.0	68.7 est.	Yes	50.9 est.	Yes	RX 7700 XT 12GB
Qwen3-4B-Thinking-2507	4.0	68.7 est.	Yes	50.9 est.	Yes	RX 7700 XT 12GB

est. = bandwidth-based estimate; measured = curated real benchmark that overrides the estimate. Fits = weights + KV(8K) + 1 GB overhead ≤ 95% of VRAM.

Fit coverage at Q4 / 8K

	RX 7700 XT 12GB	T4 16GB
Catalog models that fit	18 of 61	25 of 61
Largest exclusive fit	—	gpt-oss-20b (21.5B)

RX 7700 XT 12GB details → · T4 16GB details →