It actually outperforms the native USB 3.0 ports on all other computers I have access to, which surprised me. (Also, they were 50% off on AliExpress at the time.) I've tested both with what I have available (various USB sticks, SSDs and HDDs in UASP-enabled external cases) and especially the PA31 seems to perform very well. I chose these for two reasons: the PA31 was the only PCIe x4 card I could find at the time that seemed okay (given that my motherboard only has PCIe 2.0, x1 ports are too slow for 3.1), and the PVU3 allowed me to use the front ports on my case. I got one PVU3 (5x USB 3.0 + internal header, PCIe x1) and one PA31-AC (1x USB 3.1 type-A, 1x type-C, PCIe x4). I bought two Orico (kinda-decent Chinese manufacturer) USB controller PCIe cards earlier this year for my severely aging X48 (ASUS Rampage Formula) motherboard - as such, I was in much of the same situation as you. The tech specs at Magewell's site claim USB 3.0 performance is 300-350 MB/s, but they have an asterisk next to that amount, and I don't see any details at the bottom concerning what they mean (although that's probably the theoretical maximum that will never be achieved if I had to guess). So that's the real-world performance to expect using USB 3.0.
Asmedia usb 3.1 driver gigabyte Pc#
Of course like you said, you want to "max out your slot's potential", but I have new Skylake PC and an external SSD in an enclosure I use to back up my files, and with the USB overhead "tax", the USB transfer speed averages around 240 - 270 MB/s if I remember correctly (I haven't had to do a back-up in a few months). I know the Gigabyte USB 3.1 expansion card says it's backwards compatible with USB 2.0 and USB 3.0, but I'm not sure if you will experience any issues with that and the Magewell capture device. I don't think using anything other than a USB 3.0 expansion card will matter for performance. That USB capture device you linked to supports USB 2.0 and USB 3.0.
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