performed your recommendations and then some. The deal is the Buffalo’s IFC-PCIE2U3 is not compatible with the Sabertooth X58 or vice versa. The IFC-PCIE2U3 and the on-board NEC USB 3.0 conflict with each other. You folks really need to get the Sabertooth X58 in house to do some compatibility testing. As both devices feature the same NEC USB 3.0 chip, they rather cancel each other out. Both perform poorly and the Buffalo driver for the IFC-PCIE2U3 conflicts with the Renesas USB 3.0 driver. Neither controller truly functions independently. In order to get the IFC-PCIE2U3 to “operate”, I have to install the Asus Renesas USB 3.0 driver. If I install the Buffalo driver, the IFC-PCIE2U3 is not recognized. If you want to talk offline, we can discuss the details. However, I am not going to waste any more time with this issue. I have performed two Windows 7 64 reinstallations and the problem persists. None of these problems existed with the IFC-PCIE2U3 when installed in Asus’ P6T. I am not angry but this issue needs to be escalated to Buffalo engineers. ?