and from NVIDIA's own Tesla K40 Accelerator Press Release:NVIDIA Tesla K40 is already available for purchase. It will soon be offered through server manufactures: Appro, ASUS, Bull, Cray, Dell, Eurotech, HP, IBM, Inspur, SGI, Sugon, Supermicro and Tyan.
Nowhere is there any mention of the card manufacturer(s). It mentions the server manufacturers that will be offering it as an option in their servers.Availability
Shipping today, the NVIDIA Tesla K40 GPU accelerator is available now and in the coming months from a variety of server manufacturers, including Appro, ASUS, Bull, Cray, Dell, Eurotech, HP, IBM, Inspur, SGI, Sugon, Supermicro and Tyan, as well as from NVIDIA reseller partners.