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DGX Spark (GH200 480GB) vs RX 7900 XTX 24GB for Local LLMs

The RX 7900 XTX 24GB has about 92% more memory bandwidth (960 vs 500 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 92% faster on the RX 7900 XTX 24GB. The DGX Spark (GH200 480GB) fits more of the catalog at Q4/8K — 66 vs 35 of 69 models (480 vs 24 GB VRAM). Largest model that fits the DGX Spark (GH200 480GB) but not the RX 7900 XTX 24GB: DeepSeek-V4-Pro (861.6B). MSRP is $3,000 for the DGX Spark (GH200 480GB) vs $999 for the RX 7900 XTX 24GB. 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 (51 shared models), the RX 7900 XTX 24GB posts the higher tok/s in 44 rows vs 7. Methodology.

Spec comparison

DGX Spark (GH200 480GB)RX 7900 XTX 24GB
VendorNVIDIAAMD
VRAM480 GB24 GB
Memory typeLPDDR5XGDDR6
Memory bandwidth500 GB/s960 GB/s
TDP170 W355 W
MSRP (list)$3,000$999
BuySearch Amazon (affiliate)ASRock Radeon RX 7900 XTX Phantom Gaming 24GB OC (affiliate) · More listings

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 51 shared models

ModelParams (B)DGX Spark (GH200 480GB) tok/sDGX Spark (GH200 480GB) fitsRX 7900 XTX 24GB tok/sRX 7900 XTX 24GB fitsWinner
MiniCPM5-1B1.08294.6 est.Yes565.7 est.YesRX 7900 XTX 24GB
Qwen3.5-2B2.0159.1 est.Yes305.5 est.YesRX 7900 XTX 24GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx2.3138.3 est.Yes265.6 est.YesRX 7900 XTX 24GB
Qwen3.6-35B-A3B36.0106.1 est.Yes203.6 est.YesRX 7900 XTX 24GB
Qwen3.5-35B-A3B34.7106.1 est.Yes203.6 est.YesRX 7900 XTX 24GB
GLM-4.7-Flash31.2106.1 est.Yes203.6 est.YesRX 7900 XTX 24GB
Qwen3-30B-A3B-Instruct-250730.5106.1 est.Yes203.6 est.YesRX 7900 XTX 24GB
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF1630.0106.1 est.Yes203.6 est.YesRX 7900 XTX 24GB
Ornith-1.0-35B35.0106.1 est.Yes203.6 est.YesRX 7900 XTX 24GB
qwen35b-a3b-fable-sft-abliterated34.7106.1 est.Yes203.6 est.YesRX 7900 XTX 24GB
Llama-3.2-3B-Instruct3.299.4 est.Yes190.9 est.YesRX 7900 XTX 24GB
gpt-oss-20b21.588.4 est.Yes169.7 est.YesRX 7900 XTX 24GB
Qwen3-Coder-Next79.7106.1 est.Yes165.8 est.NoRX 7900 XTX 24GB
gemma-4-26B-A4B-it25.283.7 est.Yes160.8 est.YesRX 7900 XTX 24GB
Qwen3-Next-80B-A3B-Instruct81.3106.1 est.Yes159.5 est.NoRX 7900 XTX 24GB

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 7900 XTX 24GB
Catalog models that fit66 of 6935 of 69
Largest exclusive fitDeepSeek-V4-Pro (861.6B)—

DGX Spark (GH200 480GB) details → · RX 7900 XTX 24GB details →