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Arc Pro B70 32GB vs RTX 4090 24GB for Local LLMs

The RTX 4090 24GB has about 66% more memory bandwidth (1,008 vs 608 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 66% faster on the RTX 4090 24GB. The Arc Pro B70 32GB fits more of the catalog at Q4/8K — 39 vs 35 of 69 models (32 vs 24 GB VRAM). Largest model that fits the Arc Pro B70 32GB but not the RTX 4090 24GB: Qwen2.5-32B-Instruct (32.8B). MSRP is $999 for the Arc Pro B70 32GB vs $1,599 for the RTX 4090 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 RTX 4090 24GB posts the higher tok/s in 40 rows vs 11. Methodology.

Spec comparison

Arc Pro B70 32GBRTX 4090 24GB
VendorIntelNVIDIA
VRAM32 GB24 GB
Memory typeGDDR6GDDR6X
Memory bandwidth608 GB/s1,008 GB/s
TDP225 W450 W
MSRP (list)$999$1,599
BuySearch Amazon (affiliate)GIGABYTE GeForce RTX 4090 Gaming OC 24GB (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)Arc Pro B70 32GB tok/sArc Pro B70 32GB fitsRTX 4090 24GB tok/sRTX 4090 24GB fitsWinner
MiniCPM5-1B1.08358.2 est.Yes593.9 est.YesRTX 4090 24GB
Qwen3.5-2B2.0193.5 est.Yes320.7 est.YesRTX 4090 24GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx2.3168.2 est.Yes278.9 est.YesRTX 4090 24GB
gpt-oss-20b21.5107.5 est.Yes225.2 measuredYesRTX 4090 24GB
Qwen3.6-35B-A3B36.0129.0 est.Yes213.8 est.YesRTX 4090 24GB
Qwen3.5-35B-A3B34.7129.0 est.Yes213.8 est.YesRTX 4090 24GB
GLM-4.7-Flash31.2129.0 est.Yes213.8 est.YesRTX 4090 24GB
Qwen3-30B-A3B-Instruct-250730.5129.0 est.Yes213.8 est.YesRTX 4090 24GB
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF1630.0129.0 est.Yes213.8 est.YesRTX 4090 24GB
Ornith-1.0-35B35.0129.0 est.Yes213.8 est.YesRTX 4090 24GB
qwen35b-a3b-fable-sft-abliterated34.7129.0 est.Yes213.8 est.YesRTX 4090 24GB
Llama-3.2-3B-Instruct3.2120.9 est.Yes200.5 est.YesRTX 4090 24GB
Qwen3-Coder-Next79.7186.8 est.No174.1 est.NoArc Pro B70 32GB
Mistral-7B-Instruct-v0.37.253.7 est.Yes183.3 measuredYesRTX 4090 24GB
Qwen3-Next-80B-A3B-Instruct81.3179.7 est.No167.5 est.NoArc Pro B70 32GB

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

Arc Pro B70 32GBRTX 4090 24GB
Catalog models that fit39 of 6935 of 69
Largest exclusive fitQwen2.5-32B-Instruct (32.8B)—

Arc Pro B70 32GB details → · RTX 4090 24GB details →