The RTX 3090 24GB has about 146% more memory bandwidth (936 vs 380 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 146% faster on the RTX 3090 24GB. The RTX 3090 24GB fits more of the catalog at Q4/8K — 33 vs 17 of 61 models (24 vs 10 GB VRAM). Largest model that fits the RTX 3090 24GB but not the Arc B570 10GB: GLM-4.7-Flash (31.2B). MSRP is $219 for the Arc B570 10GB vs $1,499 for the RTX 3090 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 (38 shared models), the RTX 3090 24GB posts the higher tok/s in 37 rows vs 1. Methodology.