This pci express based serial add on card allows you to turn a pci express slot into two rs232 db9 serial ports based on a native single chip design reduces the load applied to the cpu by as much as 48 over conventional serial cards 2 x dsub 9 serial ports male uart 16c950 chipset mcs9901 data transfer rate up to 230 400 bps compliant with pci express base specification 11 compliant with pci power management 12 operating temperature 0 c 70 c operating humidity 25 65