RTX 4070 Ti 12GB vs RX 9070 16GB for Local LLMs

The RX 9070 16GB has about 16% more memory bandwidth (640 vs 554 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 16% faster on the RX 9070 16GB. The RX 9070 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 RX 9070 16GB but not the RTX 4070 Ti 12GB: gpt-oss-20b (21.5B). MSRP is $799 for the RTX 4070 Ti 12GB vs $549 for the RX 9070 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 9070 16GB posts the higher tok/s in 33 rows vs 7. Methodology.

Spec comparison

	RTX 4070 Ti 12GB	RX 9070 16GB
Vendor	NVIDIA	AMD
VRAM	12 GB	16 GB
Memory type	GDDR6X	GDDR6
Memory bandwidth	554 GB/s	640 GB/s
TDP	285 W	220 W
MSRP (list)	$799	$549
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)	RTX 4070 Ti 12GB tok/s	RTX 4070 Ti 12GB fits	RX 9070 16GB tok/s	RX 9070 16GB fits	Winner
Qwen3-0.6B	0.8	440.7 est.	Yes	509.1 est.	Yes	RX 9070 16GB
gemma-3-1b-it	1.0	352.5 est.	Yes	407.3 est.	Yes	RX 9070 16GB
Llama-3.2-1B-Instruct	1.2	293.8 est.	Yes	339.4 est.	Yes	RX 9070 16GB
Qwen3-30B-A3B	30.5	143.1 est.	No	293.9 est.	No	RX 9070 16GB
Qwen3-Coder-30B-A3B-Instruct	30.5	143.1 est.	No	293.9 est.	No	RX 9070 16GB
Qwen3-30B-A3B-Instruct-2507	30.5	143.1 est.	No	293.9 est.	No	RX 9070 16GB
GLM-4.7-Flash	31.2	137.4 est.	No	282.1 est.	No	RX 9070 16GB
Qwen3-1.7B	2.0	176.3 est.	Yes	203.6 est.	Yes	RX 9070 16GB
gpt-oss-20b	21.5	163.1 measured	No	113.1 est.	Yes	RTX 4070 Ti 12GB
Llama-3.2-3B-Instruct	3.2	110.2 est.	Yes	127.3 est.	Yes	RX 9070 16GB
Phi-4-mini-instruct	3.8	92.8 est.	Yes	107.2 est.	Yes	RX 9070 16GB
Phi-4-mini-reasoning	3.8	92.8 est.	Yes	107.2 est.	Yes	RX 9070 16GB
gemma-3-4b-it	4.3	90.4 est.	Yes	104.4 est.	Yes	RX 9070 16GB
Qwen3-4B-Instruct-2507	4.0	88.1 est.	Yes	101.8 est.	Yes	RX 9070 16GB
Qwen3-4B-Thinking-2507	4.0	88.1 est.	Yes	101.8 est.	Yes	RX 9070 16GB

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

	RTX 4070 Ti 12GB	RX 9070 16GB
Catalog models that fit	18 of 61	25 of 61
Largest exclusive fit	—	gpt-oss-20b (21.5B)

RTX 4070 Ti 12GB details → · RX 9070 16GB details →