RTX 4070 Ti Super 16GB vs RX 7900 XTX 24GB for Local LLMs

The RX 7900 XTX 24GB has about 43% more memory bandwidth (960 vs 672 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 43% faster on the RX 7900 XTX 24GB. The RX 7900 XTX 24GB fits more of the catalog at Q4/8K — 33 vs 25 of 61 models (24 vs 16 GB VRAM). Largest model that fits the RX 7900 XTX 24GB but not the RTX 4070 Ti Super 16GB: GLM-4.7-Flash (31.2B). MSRP is $799 for the RTX 4070 Ti Super 16GB vs $999 for the RX 7900 XTX 24GB. 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 (44 shared models), the RX 7900 XTX 24GB posts the higher tok/s in 34 rows vs 10. Methodology.

Spec comparison

	RTX 4070 Ti Super 16GB	RX 7900 XTX 24GB
Vendor	NVIDIA	AMD
VRAM	16 GB	24 GB
Memory type	GDDR6X	GDDR6
Memory bandwidth	672 GB/s	960 GB/s
TDP	285 W	355 W
MSRP (list)	$799	$999
Buy	Search Amazon (affiliate)	ASRock Radeon RX 7900 XTX Phantom Gaming 24GB OC (affiliate) · More listings

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 44 shared models

Model	Params (B)	RTX 4070 Ti Super 16GB tok/s	RTX 4070 Ti Super 16GB fits	RX 7900 XTX 24GB tok/s	RX 7900 XTX 24GB fits	Winner
Qwen3-0.6B	0.8	534.5 est.	Yes	763.6 est.	Yes	RX 7900 XTX 24GB
gemma-3-1b-it	1.0	427.6 est.	Yes	610.9 est.	Yes	RX 7900 XTX 24GB
Llama-3.2-1B-Instruct	1.2	356.4 est.	Yes	509.1 est.	Yes	RX 7900 XTX 24GB
Qwen3-30B-A3B	30.5	308.6 est.	No	203.6 est.	Yes	RTX 4070 Ti Super 16GB
Qwen3-Coder-30B-A3B-Instruct	30.5	308.6 est.	No	203.6 est.	Yes	RTX 4070 Ti Super 16GB
Qwen3-30B-A3B-Instruct-2507	30.5	308.6 est.	No	203.6 est.	Yes	RTX 4070 Ti Super 16GB
Qwen3-1.7B	2.0	213.8 est.	Yes	305.5 est.	Yes	RX 7900 XTX 24GB
GLM-4.7-Flash	31.2	296.3 est.	No	203.6 est.	Yes	RTX 4070 Ti Super 16GB
Llama-3.2-3B-Instruct	3.2	199.0 measured	Yes	190.9 est.	Yes	RTX 4070 Ti Super 16GB
gpt-oss-20b	21.5	118.8 est.	Yes	169.7 est.	Yes	RX 7900 XTX 24GB
Qwen3-Coder-Next	79.7	50.5 est.	No	162.3 est.	No	RX 7900 XTX 24GB
Phi-4-mini-instruct	3.8	112.5 est.	Yes	160.8 est.	Yes	RX 7900 XTX 24GB
Phi-4-mini-reasoning	3.8	112.5 est.	Yes	160.8 est.	Yes	RX 7900 XTX 24GB
gemma-3-4b-it	4.3	109.7 est.	Yes	156.6 est.	Yes	RX 7900 XTX 24GB
Qwen3-Next-80B-A3B-Instruct	81.3	48.6 est.	No	156.2 est.	No	RX 7900 XTX 24GB

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 Super 16GB	RX 7900 XTX 24GB
Catalog models that fit	25 of 61	33 of 61
Largest exclusive fit	—	GLM-4.7-Flash (31.2B)

RTX 4070 Ti Super 16GB details → · RX 7900 XTX 24GB details →