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Arc Pro B70 32GB vs RTX 4070 12GB for Local LLMs

The Arc Pro B70 32GB has about 21% more memory bandwidth (608 vs 504 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 21% faster on the Arc Pro B70 32GB. The Arc Pro B70 32GB fits more of the catalog at Q4/8K — 39 vs 18 of 69 models (32 vs 12 GB VRAM). Largest model that fits the Arc Pro B70 32GB but not the RTX 4070 12GB: Qwen3.6-35B-A3B (36.0B). MSRP is $999 for the Arc Pro B70 32GB vs $599 for the RTX 4070 12GB. 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 (41 shared models), the Arc Pro B70 32GB posts the higher tok/s in 29 rows vs 12. Methodology.

Spec comparison

Arc Pro B70 32GBRTX 4070 12GB
VendorIntelNVIDIA
VRAM32 GB12 GB
Memory typeGDDR6GDDR6X
Memory bandwidth608 GB/s504 GB/s
TDP225 W200 W
MSRP (list)$999$599
BuySearch Amazon (affiliate)ASUS Dual GeForce RTX 4070 OC 12GB (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 41 shared models

ModelParams (B)Arc Pro B70 32GB tok/sArc Pro B70 32GB fitsRTX 4070 12GB tok/sRTX 4070 12GB fitsWinner
MiniCPM5-1B1.08358.2 est.Yes297.0 est.YesArc Pro B70 32GB
gpt-oss-20b21.5107.5 est.Yes198.8 est.NoRTX 4070 12GB
Qwen3.5-2B2.0193.5 est.Yes160.4 est.YesArc Pro B70 32GB
Qwen3-Coder-Next79.7186.8 est.No21.7 est.NoArc Pro B70 32GB
Qwen3-Next-80B-A3B-Instruct81.3179.7 est.No20.9 est.NoArc Pro B70 32GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx2.3168.2 est.Yes139.4 est.YesArc Pro B70 32GB
Llama-3.2-3B-Instruct3.2120.9 est.Yes160.7 measuredYesRTX 4070 12GB
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF1630.0129.0 est.Yes142.5 est.NoRTX 4070 12GB
gemma-4-26B-A4B-it25.2101.8 est.Yes141.7 est.NoRTX 4070 12GB
Qwen3-30B-A3B-Instruct-250730.5129.0 est.Yes129.7 est.NoRTX 4070 12GB
Qwen3.6-35B-A3B36.0129.0 est.Yes100.5 est.NoArc Pro B70 32GB
Qwen3.5-35B-A3B34.7129.0 est.Yes107.8 est.NoArc Pro B70 32GB
GLM-4.7-Flash31.2129.0 est.Yes124.5 est.NoArc Pro B70 32GB
Ornith-1.0-35B35.0129.0 est.Yes100.8 est.NoArc Pro B70 32GB
qwen35b-a3b-fable-sft-abliterated34.7129.0 est.Yes102.3 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 4070 12GB
Catalog models that fit39 of 6918 of 69
Largest exclusive fitQwen3.6-35B-A3B (36.0B)—

Arc Pro B70 32GB details → · RTX 4070 12GB details →