Arc B570 10GB vs RTX 4090D 24GB (China) for Local LLMs
The RTX 4090D 24GB (China) has about 165% more memory bandwidth (1,008 vs 380 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 165% faster on the RTX 4090D 24GB (China). The RTX 4090D 24GB (China) 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 4090D 24GB (China) but not the Arc B570 10GB: GLM-4.7-Flash (31.2B). MSRP is $219 for the Arc B570 10GB vs $1,599 for the RTX 4090D 24GB (China). MSRP is a launch list price, not live retail — Amazon prices move; click through for the current price. Not retail-shoppable: RTX 4090D 24GB (China) (datacenter-class; cloud rental is the realistic way to use it). In the Q4/8K head-to-head below (38 shared models), the RTX 4090D 24GB (China) posts the higher tok/s in 37 rows vs 1. Methodology.