(1) See
graphics accelerator.
(2) A plug-in card that improves the performance of a desktop computer or server. Accelerator cards are used for cryptocurrency mining, artificial intelligence (AI), big data analysis and other compute-intensive operations.
Datacenter Accelerator Card
This programmable accelerator card from Xilinx is used in datacenter servers to speed up operations such as machine learning. (Image courtesy of Xilinx.)