Question 1

Is the Arc A770 16GB or the RX 7800 XT 16GB better for local LLMs?

Accepted Answer

The RX 7800 XT 16GB has about 11% more memory bandwidth (624 vs 560 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 11% faster on the RX 7800 XT 16GB. Both fit the same number of catalog models at Q4/8K (25 of 61; 16 vs 16 GB VRAM). MSRP is $349 for the Arc A770 16GB vs $499 for the RX 7800 XT 16GB. 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 7800 XT 16GB for LLM inference?

Accepted Answer

On memory bandwidth the RX 7800 XT 16GB leads by about 11% (624 vs 560 GB/s), and batch-1 decode tracks bandwidth. In the Q4/8K head-to-head on this page, the Arc A770 16GB wins 0 of 44 shared model rows and the RX 7800 XT 16GB wins 44.

Question 3

Which can run larger models, the Arc A770 16GB or the RX 7800 XT 16GB?

Accepted Answer

Neither — both fit 25 of 61 catalog models at Q4/8K (16 vs 16 GB VRAM).

	Arc A770 16GB	RX 7800 XT 16GB
Vendor	Intel	AMD
VRAM	16 GB	16 GB
Memory type	GDDR6	GDDR6
Memory bandwidth	560 GB/s	624 GB/s
TDP	225 W	263 W
MSRP (list)	$349	$499
Buy	Search Amazon (affiliate)	Search Amazon (affiliate)

Model	Params (B)	Arc A770 16GB tok/s	Arc A770 16GB fits	RX 7800 XT 16GB tok/s	RX 7800 XT 16GB fits	Winner
Qwen3-0.6B	0.8	445.5 est.	Yes	496.4 est.	Yes	RX 7800 XT 16GB
gemma-3-1b-it	1.0	356.4 est.	Yes	397.1 est.	Yes	RX 7800 XT 16GB
Llama-3.2-1B-Instruct	1.2	297.0 est.	Yes	330.9 est.	Yes	RX 7800 XT 16GB
Qwen3-30B-A3B	30.5	257.2 est.	No	286.6 est.	No	RX 7800 XT 16GB
Qwen3-Coder-30B-A3B-Instruct	30.5	257.2 est.	No	286.6 est.	No	RX 7800 XT 16GB
Qwen3-30B-A3B-Instruct-2507	30.5	257.2 est.	No	286.6 est.	No	RX 7800 XT 16GB
GLM-4.7-Flash	31.2	246.9 est.	No	275.1 est.	No	RX 7800 XT 16GB
Qwen3-1.7B	2.0	178.2 est.	Yes	198.5 est.	Yes	RX 7800 XT 16GB
Llama-3.2-3B-Instruct	3.2	111.4 est.	Yes	124.1 est.	Yes	RX 7800 XT 16GB
gpt-oss-20b	21.5	99.0 est.	Yes	110.3 est.	Yes	RX 7800 XT 16GB
Phi-4-mini-instruct	3.8	93.8 est.	Yes	104.5 est.	Yes	RX 7800 XT 16GB
Phi-4-mini-reasoning	3.8	93.8 est.	Yes	104.5 est.	Yes	RX 7800 XT 16GB
gemma-3-4b-it	4.3	91.4 est.	Yes	101.8 est.	Yes	RX 7800 XT 16GB
Qwen3-4B-Instruct-2507	4.0	89.1 est.	Yes	99.3 est.	Yes	RX 7800 XT 16GB
Qwen3-4B-Thinking-2507	4.0	89.1 est.	Yes	99.3 est.	Yes	RX 7800 XT 16GB

Arc A770 16GB vs RX 7800 XT 16GB for Local LLMs

Spec comparison

Q4 / 8K head-to-head — top 15 of 44 shared models

Fit coverage at Q4 / 8K

	Arc A770 16GB	RX 7800 XT 16GB
Catalog models that fit	25 of 61	25 of 61
Largest exclusive fit	—	—