Question 1

Is the RTX 5070 12GB or the RX 7700 XT 12GB better for local LLMs?

Accepted Answer

The RTX 5070 12GB has about 56% more memory bandwidth (672 vs 432 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 56% faster on the RTX 5070 12GB. Both fit the same number of catalog models at Q4/8K (18 of 61; 12 vs 12 GB VRAM). MSRP is $549 for the RTX 5070 12GB vs $449 for the RX 7700 XT 12GB. MSRP is a launch list price, not live retail — Amazon prices move; click through for the current price.

Question 2

How much faster is the RTX 5070 12GB than the RX 7700 XT 12GB for LLM inference?

Accepted Answer

On memory bandwidth the RTX 5070 12GB leads by about 56% (672 vs 432 GB/s), and batch-1 decode tracks bandwidth. In the Q4/8K head-to-head on this page, the RTX 5070 12GB wins 40 of 40 shared model rows and the RX 7700 XT 12GB wins 0.

Question 3

Which can run larger models, the RTX 5070 12GB or the RX 7700 XT 12GB?

Accepted Answer

Neither — both fit 18 of 61 catalog models at Q4/8K (12 vs 12 GB VRAM).

	RTX 5070 12GB	RX 7700 XT 12GB
Vendor	NVIDIA	AMD
VRAM	12 GB	12 GB
Memory type	GDDR7	GDDR6
Memory bandwidth	672 GB/s	432 GB/s
TDP	250 W	245 W
MSRP (list)	$549	$449
Buy	Search Amazon (affiliate)	Search Amazon (affiliate)

Model	Params (B)	RTX 5070 12GB tok/s	RTX 5070 12GB fits	RX 7700 XT 12GB tok/s	RX 7700 XT 12GB fits	Winner
Qwen3-0.6B	0.8	534.5 est.	Yes	343.6 est.	Yes	RTX 5070 12GB
gemma-3-1b-it	1.0	427.6 est.	Yes	274.9 est.	Yes	RTX 5070 12GB
Llama-3.2-1B-Instruct	1.2	356.4 est.	Yes	229.1 est.	Yes	RTX 5070 12GB
gpt-oss-20b	21.5	266.2 est.	No	171.1 est.	No	RTX 5070 12GB
Qwen3-1.7B	2.0	213.8 est.	Yes	137.5 est.	Yes	RTX 5070 12GB
Qwen3-30B-A3B	30.5	173.6 est.	No	111.6 est.	No	RTX 5070 12GB
Qwen3-Coder-30B-A3B-Instruct	30.5	173.6 est.	No	111.6 est.	No	RTX 5070 12GB
Qwen3-30B-A3B-Instruct-2507	30.5	173.6 est.	No	111.6 est.	No	RTX 5070 12GB
GLM-4.7-Flash	31.2	166.6 est.	No	107.1 est.	No	RTX 5070 12GB
Llama-3.2-3B-Instruct	3.2	133.6 est.	Yes	85.9 est.	Yes	RTX 5070 12GB
Mistral-7B-Instruct-v0.3	7.2	120.5 measured	Yes	38.2 est.	Yes	RTX 5070 12GB
Phi-4-mini-instruct	3.8	112.5 est.	Yes	72.3 est.	Yes	RTX 5070 12GB
Phi-4-mini-reasoning	3.8	112.5 est.	Yes	72.3 est.	Yes	RTX 5070 12GB
gemma-3-4b-it	4.3	109.7 est.	Yes	70.5 est.	Yes	RTX 5070 12GB
Qwen3-4B-Instruct-2507	4.0	106.9 est.	Yes	68.7 est.	Yes	RTX 5070 12GB

RTX 5070 12GB vs RX 7700 XT 12GB for Local LLMs

Spec comparison

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

Fit coverage at Q4 / 8K

	RTX 5070 12GB	RX 7700 XT 12GB
Catalog models that fit	18 of 61	18 of 61
Largest exclusive fit	—	—