Tenext PCI Express 4-Port SuperSpeed USB 3.0 Controller Adapter Card with SATA Power (Fulfilled by Amazon) NEC Renesas µPD720201 chipset

Updates to the Linux xhci driver rendered my previous host adapter unusable w/ USB3 devices. They would function OK when hot plugged, but not at any other time.Since the seller advertises this as Linux compatible and I had heard comments elsewhere that the Renesas chipset was working OK w/ xhci, I thought I'd give this host adapter a shot. Unfortunately, more or less the same story. Most USB3 devices plugged in at boot time simply are never seen.It does seem to function correctly for devices identified by the ehci (USB2) driver, e.g., a web cam. And, as previously, when a USB3 device is hot plugged, it works OK.So..., if you're looking for complete USB3 support from a PCI USB host adapter, I'm afraid this isn't the one.Unfortunately, as is often the case w/ Linux, identifying the offending component w/ certainty is difficult. There are a few snide comments regarding the xhci driver out there, but I don't honestly know where the problem is for sure. All I know is that xhci and this card don't get along after all.FWIW: Fedora 19, Kernel 3.14.7-100

Does the job, although about half the time, the drivers fail to start correctly when restarting Windows, requiring a power cycle to work.

The PC I installed this into (Windows 8) detected and installed the drivers automatically - no need to use the enclosed mini CD.There is also a 4-pin Molex version of this card out there. Keep in mind that you need SATA power for the card in this review.Tested the transfer rates by moving a 1GB file to and from an external HDD to an internal one. No idea if there's a bottleneck in my system, so take these readings as you will.External HDD to internal HDD - 140MB/s, though starts to taper down to 110MB/s after 500MB or so.Internal HDD to external HDD - 100MB/s, but wavers (more like 90-110MB/s)There are faster cards out there (supposedly some can sustain as high as 170MB/s), but this card is definitely a huge improvement over USB 2.0, and you can't beat the price. Works as advertised.

Installed in an older Dell Vostro 420, Windows 10 x64, drivers installed without issue, and I got better performance than with the original USB 2.0 ports. I've found best performance is when you are not copying between two USB devices, but go between the hard-drive and a USB device. Not sure if the controller gets overwhelmed when trying to work between two USB devices? But it works as expected, and definitely faster than the 2.0 ports in the tower.