Due to USB 3.0 ports in the nMP, native drivers are provided in OS X for Fresco Logic FL1100 chipset cards in ML 10.8.2 or later. Transferring data over USB 3.0 interferes with bluetooth reception and to a lesser extent 2.4Ghz Wi-Fi. The cMP will never boot from USB 3 or newer because there is no support until the drivers load in the OS. The USB 3.0 cards in the list are not limited to storage-only USB devices (exceptions to this are noted). The USB 3.0 cards in this list do not require supplemental power to be attached. The USB 3.0 cards in this list support UASP for faster transfer speeds and reduced CPU utilization (exceptions to this are noted). This thread refers to PCIe cards for adding USB 3.0 and 3.1 to classic Mac Pros. Replace the computer cover and reconnect the power cord.Thread summary for latest recommendations. 
Replace the slot bracket’s holding screw to secure the card. To install the card, carefully align the card’s bus connector with the selected PCIe slot on the motherboard. 
Remove the slot bracket from an available PCIe slot.Unplug the power cord and remove your computer’s cover.One available PCI Express slot (Recommend PCI Express 2.0) Package Contents.Support Windows® XP/Vista/7 (32/64 bit), Linux System Requirements.Hot-swapping feature allows you to connect/disconnect devices without powering down the system.Each USB port supports Power supply 5V/3A output by itself.Supports 2 downstream ports for all speeds.Supports simultaneous operation of multiple USB 3.0, USB 2.0 and USB 1.1 devices supporting the following speed data rates as follows: Low-speed (1.5Mbps) / Full-speed (12Mbps) / High-speed (480Mbps) / Super-speed (5Gbps).
Compliant with Universal Serial Bus 3.0 specification Revision 1.0.
Single-lane (x1) PCI Express throughput rates up to 5 Gbps. Fully compliant with PCI Express Base Specification Revision 2.0. 8.1 Related Manuals / Resources DIGITUS DS-30220-5 PCIE Card USB 3.0 2 Port Self Power Features
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