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RTX A6000 48GB vs DGX Spark (GH200 480GB) for Local LLMs

The RTX A6000 48GB has about 54% more memory bandwidth (768 vs 500 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 54% faster on the RTX A6000 48GB. The DGX Spark (GH200 480GB) fits more of the catalog at Q4/8K — 66 vs 41 of 69 models (480 vs 48 GB VRAM). Largest model that fits the DGX Spark (GH200 480GB) but not the RTX A6000 48GB: DeepSeek-V4-Pro (861.6B). MSRP is $4,500 for the RTX A6000 48GB vs $3,000 for the DGX Spark (GH200 480GB). 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 (57 shared models), the RTX A6000 48GB posts the higher tok/s in 52 rows vs 5. Methodology.

Spec comparison

RTX A6000 48GBDGX Spark (GH200 480GB)
VendorNVIDIANVIDIA
VRAM48 GB480 GB
Memory typeGDDR6LPDDR5X
Memory bandwidth768 GB/s500 GB/s
TDP300 W170 W
MSRP (list)$4,500$3,000
BuySearch 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 57 shared models

ModelParams (B)RTX A6000 48GB tok/sRTX A6000 48GB fitsDGX Spark (GH200 480GB) tok/sDGX Spark (GH200 480GB) fitsWinner
MiniCPM5-1B1.08452.5 est.Yes294.6 est.YesRTX A6000 48GB
Qwen3.5-2B2.0244.4 est.Yes159.1 est.YesRTX A6000 48GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx2.3212.5 est.Yes138.3 est.YesRTX A6000 48GB
Qwen3.6-35B-A3B36.0162.9 est.Yes106.1 est.YesRTX A6000 48GB
Qwen3.5-35B-A3B34.7162.9 est.Yes106.1 est.YesRTX A6000 48GB
GLM-4.7-Flash31.2162.9 est.Yes106.1 est.YesRTX A6000 48GB
Qwen3-30B-A3B-Instruct-250730.5162.9 est.Yes106.1 est.YesRTX A6000 48GB
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF1630.0162.9 est.Yes106.1 est.YesRTX A6000 48GB
Qwen3-Coder-Next79.7162.9 est.Yes106.1 est.YesRTX A6000 48GB
Ornith-1.0-35B35.0162.9 est.Yes106.1 est.YesRTX A6000 48GB
Qwen3-Next-80B-A3B-Instruct81.3162.9 est.Yes106.1 est.YesRTX A6000 48GB
qwen35b-a3b-fable-sft-abliterated34.7162.9 est.Yes106.1 est.YesRTX A6000 48GB
Llama-3.2-3B-Instruct3.2152.7 est.Yes99.4 est.YesRTX A6000 48GB
gpt-oss-20b21.5135.8 est.Yes88.4 est.YesRTX A6000 48GB
gpt-oss-120b120.4135.3 est.No62.4 est.YesRTX A6000 48GB

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

RTX A6000 48GBDGX Spark (GH200 480GB)
Catalog models that fit41 of 6966 of 69
Largest exclusive fit—DeepSeek-V4-Pro (861.6B)

RTX A6000 48GB details → · DGX Spark (GH200 480GB) details →