"..The Hot Rod™66 card can be used with any FX, LX, EX, ZX, board and although the BX chipset was designed to be compatible with the Ultra ATA/66 specification, it is only capable of running at a maximum of 33 Mbytes/sec, thus offering no advantage over UDMA/33. With the help of the ABIT Hot Rod 66, your mainboard can support this specification at its intended 66 Mbytes/sec of data throughput. The result is maximum disc performance using the current PCI local bus environment.."