Question 1

Is the Arc A770 16GB or the RX 7700 XT 12GB better for local LLMs?

Accepted Answer

The Arc A770 16GB has about 30% more memory bandwidth (560 vs 432 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 30% faster on the Arc A770 16GB. The Arc A770 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 Arc A770 16GB but not the RX 7700 XT 12GB: gpt-oss-20b (21.5B). MSRP is $349 for the Arc A770 16GB 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 Arc A770 16GB than the RX 7700 XT 12GB for LLM inference?

Accepted Answer

On memory bandwidth the Arc A770 16GB leads by about 30% (560 vs 432 GB/s), and batch-1 decode tracks bandwidth. In the Q4/8K head-to-head on this page, the Arc A770 16GB wins 33 of 40 shared model rows and the RX 7700 XT 12GB wins 7.

Question 3

Which can run larger models, the Arc A770 16GB or the RX 7700 XT 12GB?

Accepted Answer

The Arc A770 16GB — it fits 25 of 61 catalog models at Q4/8K vs 18 (16 vs 12 GB VRAM). Largest model that fits only the Arc A770 16GB: gpt-oss-20b (21.5B).

	Arc A770 16GB	RX 7700 XT 12GB
Vendor	Intel	AMD
VRAM	16 GB	12 GB
Memory type	GDDR6	GDDR6
Memory bandwidth	560 GB/s	432 GB/s
TDP	225 W	245 W
MSRP (list)	$349	$449
Buy	Search Amazon (affiliate)	Search Amazon (affiliate)

Model	Params (B)	Arc A770 16GB tok/s	Arc A770 16GB fits	RX 7700 XT 12GB tok/s	RX 7700 XT 12GB fits	Winner
Qwen3-0.6B	0.8	445.5 est.	Yes	343.6 est.	Yes	Arc A770 16GB
gemma-3-1b-it	1.0	356.4 est.	Yes	274.9 est.	Yes	Arc A770 16GB
Llama-3.2-1B-Instruct	1.2	297.0 est.	Yes	229.1 est.	Yes	Arc A770 16GB
Qwen3-30B-A3B	30.5	257.2 est.	No	111.6 est.	No	Arc A770 16GB
Qwen3-Coder-30B-A3B-Instruct	30.5	257.2 est.	No	111.6 est.	No	Arc A770 16GB
Qwen3-30B-A3B-Instruct-2507	30.5	257.2 est.	No	111.6 est.	No	Arc A770 16GB
GLM-4.7-Flash	31.2	246.9 est.	No	107.1 est.	No	Arc A770 16GB
Qwen3-1.7B	2.0	178.2 est.	Yes	137.5 est.	Yes	Arc A770 16GB
gpt-oss-20b	21.5	99.0 est.	Yes	171.1 est.	No	RX 7700 XT 12GB
Llama-3.2-3B-Instruct	3.2	111.4 est.	Yes	85.9 est.	Yes	Arc A770 16GB
Phi-4-mini-instruct	3.8	93.8 est.	Yes	72.3 est.	Yes	Arc A770 16GB
Phi-4-mini-reasoning	3.8	93.8 est.	Yes	72.3 est.	Yes	Arc A770 16GB
gemma-3-4b-it	4.3	91.4 est.	Yes	70.5 est.	Yes	Arc A770 16GB
Qwen3-4B-Instruct-2507	4.0	89.1 est.	Yes	68.7 est.	Yes	Arc A770 16GB
Qwen3-4B-Thinking-2507	4.0	89.1 est.	Yes	68.7 est.	Yes	Arc A770 16GB

Arc A770 16GB 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

	Arc A770 16GB	RX 7700 XT 12GB
Catalog models that fit	25 of 61	18 of 61
Largest exclusive fit	gpt-oss-20b (21.5B)	—