NEC chipset is one of the best USB port chipset manufacturers. USB 2.0 PCI-Express card CD Driver User manual. Transfer rate: each port up to 480Mpbs, Over current protection, each port 500mA, Simultaneous operation of multiple high-performance devices, Fully plug & play and hot swapping supported, Supports up to 127 devices per port.
NEC 720101 Chipset, 1-Lane (x1) PCI-Express with transfer rate 2.5Gb/s full duplex channel.
5x Ports Adaptor includes 4x External + 1x Internal Ports (shared with first external port).
Compliant with PCI-Express Revision 1.0a.
Backward compatible with USB 1.1 devices.
USB 2.0 EHCI and USB 1.1 OHCI compliant.