DGX Spark (GH200 480GB) vs RX 7800 XT 16GB for Local LLMs

The RX 7800 XT 16GB has about 25% more memory bandwidth (624 vs 500 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 25% faster on the RX 7800 XT 16GB. The DGX Spark (GH200 480GB) fits more of the catalog at Q4/8K — 66 vs 24 of 69 models (480 vs 16 GB VRAM). Largest model that fits the DGX Spark (GH200 480GB) but not the RX 7800 XT 16GB: DeepSeek-V4-Pro (861.6B). MSRP is $3,000 for the DGX Spark (GH200 480GB) 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. In the Q4/8K head-to-head below (44 shared models), the RX 7800 XT 16GB posts the higher tok/s in 39 rows vs 5. Methodology.

Spec comparison

	DGX Spark (GH200 480GB)	RX 7800 XT 16GB
Vendor	NVIDIA	AMD
VRAM	480 GB	16 GB
Memory type	LPDDR5X	GDDR6
Memory bandwidth	500 GB/s	624 GB/s
TDP	170 W	263 W
MSRP (list)	$3,000	$499
Buy	Search Amazon (affiliate)	Search Amazon (affiliate)

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)	DGX Spark (GH200 480GB) tok/s	DGX Spark (GH200 480GB) fits	RX 7800 XT 16GB tok/s	RX 7800 XT 16GB fits	Winner
MiniCPM5-1B	1.08	294.6 est.	Yes	367.7 est.	Yes	RX 7800 XT 16GB
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16	30.0	106.1 est.	Yes	314.1 est.	No	RX 7800 XT 16GB
Qwen3-30B-A3B-Instruct-2507	30.5	106.1 est.	Yes	285.7 est.	No	RX 7800 XT 16GB
GLM-4.7-Flash	31.2	106.1 est.	Yes	274.2 est.	No	RX 7800 XT 16GB
Qwen3.5-35B-A3B	34.7	106.1 est.	Yes	237.5 est.	No	RX 7800 XT 16GB
qwen35b-a3b-fable-sft-abliterated	34.7	106.1 est.	Yes	225.5 est.	No	RX 7800 XT 16GB
Ornith-1.0-35B	35.0	106.1 est.	Yes	222.0 est.	No	RX 7800 XT 16GB
Qwen3.6-35B-A3B	36.0	106.1 est.	Yes	221.4 est.	No	RX 7800 XT 16GB
Qwen3.5-2B	2.0	159.1 est.	Yes	198.5 est.	Yes	RX 7800 XT 16GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx	2.3	138.3 est.	Yes	172.6 est.	Yes	RX 7800 XT 16GB
Llama-3.2-3B-Instruct	3.2	99.4 est.	Yes	124.1 est.	Yes	RX 7800 XT 16GB
gpt-oss-20b	21.5	88.4 est.	Yes	110.3 est.	Yes	RX 7800 XT 16GB
Qwen3-Coder-Next	79.7	106.1 est.	Yes	47.9 est.	No	DGX Spark (GH200 480GB)
Qwen3-Next-80B-A3B-Instruct	81.3	106.1 est.	Yes	46.0 est.	No	DGX Spark (GH200 480GB)
gemma-4-26B-A4B-it	25.2	83.7 est.	Yes	104.5 est.	Yes	RX 7800 XT 16GB

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

	DGX Spark (GH200 480GB)	RX 7800 XT 16GB
Catalog models that fit	66 of 69	24 of 69
Largest exclusive fit	DeepSeek-V4-Pro (861.6B)	—

DGX Spark (GH200 480GB) details → · RX 7800 XT 16GB details →