Question 1

Is the RX 7800 XT 16GB or the RX 7900 GRE 16GB better for local LLMs?

Accepted Answer

The RX 7800 XT 16GB has about 8% more memory bandwidth (624 vs 576 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 8% 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 $499 for the RX 7800 XT 16GB vs $549 for the RX 7900 GRE 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 RX 7800 XT 16GB than the RX 7900 GRE 16GB for LLM inference?

Accepted Answer

On memory bandwidth the RX 7800 XT 16GB leads by about 8% (624 vs 576 GB/s), and batch-1 decode tracks bandwidth. In the Q4/8K head-to-head on this page, the RX 7800 XT 16GB wins 44 of 44 shared model rows and the RX 7900 GRE 16GB wins 0.

Question 3

Which can run larger models, the RX 7800 XT 16GB or the RX 7900 GRE 16GB?

Accepted Answer

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

	RX 7800 XT 16GB	RX 7900 GRE 16GB
Vendor	AMD	AMD
VRAM	16 GB	16 GB
Memory type	GDDR6	GDDR6
Memory bandwidth	624 GB/s	576 GB/s
TDP	263 W	260 W
MSRP (list)	$499	$549
Buy	Search Amazon (affiliate)	Search Amazon (affiliate)

Model	Params (B)	RX 7800 XT 16GB tok/s	RX 7800 XT 16GB fits	RX 7900 GRE 16GB tok/s	RX 7900 GRE 16GB fits	Winner
Qwen3-0.6B	0.8	496.4 est.	Yes	458.2 est.	Yes	RX 7800 XT 16GB
gemma-3-1b-it	1.0	397.1 est.	Yes	366.5 est.	Yes	RX 7800 XT 16GB
Llama-3.2-1B-Instruct	1.2	330.9 est.	Yes	305.5 est.	Yes	RX 7800 XT 16GB
Qwen3-30B-A3B	30.5	286.6 est.	No	264.5 est.	No	RX 7800 XT 16GB
Qwen3-Coder-30B-A3B-Instruct	30.5	286.6 est.	No	264.5 est.	No	RX 7800 XT 16GB
Qwen3-30B-A3B-Instruct-2507	30.5	286.6 est.	No	264.5 est.	No	RX 7800 XT 16GB
GLM-4.7-Flash	31.2	275.1 est.	No	253.9 est.	No	RX 7800 XT 16GB
Qwen3-1.7B	2.0	198.5 est.	Yes	183.3 est.	Yes	RX 7800 XT 16GB
Llama-3.2-3B-Instruct	3.2	124.1 est.	Yes	114.5 est.	Yes	RX 7800 XT 16GB
gpt-oss-20b	21.5	110.3 est.	Yes	101.8 est.	Yes	RX 7800 XT 16GB
Phi-4-mini-instruct	3.8	104.5 est.	Yes	96.5 est.	Yes	RX 7800 XT 16GB
Phi-4-mini-reasoning	3.8	104.5 est.	Yes	96.5 est.	Yes	RX 7800 XT 16GB
gemma-3-4b-it	4.3	101.8 est.	Yes	94.0 est.	Yes	RX 7800 XT 16GB
Qwen3-4B-Instruct-2507	4.0	99.3 est.	Yes	91.6 est.	Yes	RX 7800 XT 16GB
Qwen3-4B-Thinking-2507	4.0	99.3 est.	Yes	91.6 est.	Yes	RX 7800 XT 16GB

RX 7800 XT 16GB vs RX 7900 GRE 16GB for Local LLMs

Spec comparison

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

Fit coverage at Q4 / 8K

	RX 7800 XT 16GB	RX 7900 GRE 16GB
Catalog models that fit	25 of 61	25 of 61
Largest exclusive fit	—	—