8-Ports PCIE Superspeed 5Gbps USB 3.0 Card for Windows and Linux Desktop PCs, 4X Dedicated 5Gbps USB 3.0 Channel 20Gbps Bandwidth, Built in FebSmart Self-Powered Technology (FS-4C-U8S-Pro)

The FS-4C-U8S-Pro is a newish (2019), Pcie Gen 3, low profile, well designed (big heatsink), four channel USB 3.0 host bus adapter. The low-profile design dictates the horizontal port placement, which some reviewers have found problematic in aligning with case slot openings. My experience, with a Lian-Li server case, is the port connector fit is snug but perfectly serviceable (try plugging in the cables before tightening the retaining screw). In addition to the 4 external ports, there are two 19 pin headers for attaching another 4 ports (though those will share bandwidth with the externals). There is also a SATA power header to provide more amperage to the ports, should you be connecting USB powered disks or other power-hungry devices. The controller chip used is the Renesas uPD720202, one per channel.My environment is an Intel 8700K CPU running VMware Esxi 6.7 U3 Free as a host OS, with a Windows Server 2012R2 VM and a couple of low use Windows 10 VMs.Performance is what I expected for rotating hdds: 200/208 Mb/s single disk, 240/258 Mb/s Raid 5 measured with ATTO, and no degradation on simultaneous usage of all 4 ports. The heatsink does a good job of keeping the chip operating temperature at 95° F in a well-ventilated case.I perform two types of daily backup to four USB 3.0 raid enclosures attached to a Server 12 Esxi VM (about 3 - 5 Tb per day). The motherboard USB controllers were unreliable in heavy usage, regularly dropping connections during backups. I tested 3 quad channel (Pcie x4) adapters in my quest to obtain reliable USB 3.0 connections for my server. This was the only card that I could get to work.It works reasonably well with individual USB devices assigned through VM settings, occasionally (randomly) dropping a device, but it works great with PCI device passthrough configured. To get passthrough configured, I had to set the ‘VMkernel.Boot.disableACSCheck’ switch to True.I have been beating the heck out of this thing 24 hours per day for a week now, and no dropped devices or failed backups.UPDATE: 1 1/2 years later and everything is still good. 100% port reliability. No issues.

Two fold, I got this for the four USB ports on the back and the two internal headers. This is honestly perfect for my use as my system doesn't have enough USB on it. Three of the four on the back go to three monitor USB hubs while the two headers attach to front panel ports that my older motherboard doesn't have headers for. They all work great and I couldn't be happier

I bought this a over a year ago and still works. Like its 2 channel counterpart but tricky to install, my case is compatible with the device, albet barely. I am currently using 2 channels plus a third for internal flash drive from one of the usb 3.0 headers. I have no problem with the usb pcie x4 4 channel. My docking station uses 1 of the external usb 3.0 ports and has no bandwith starvation like it did when connected to central usb 3.0 ports. I have a lot of usb devices connected to my desktop, and this is the best solution I needed. I also connect usb hubs and what not, and they all work. This is a great docking PCIe x4 in my pc, which is low profile and only 1 pcie x 16 slot. At the moment the 2 channel is not being sold, but this one is. That one was good as well, but I wanted 4 channels in one pcie x 16 slot, and they made it compatable with 1 slot as well.The only real downside of this its a lot more expensive, but its worth it. It also uses 20 MSI, or 5 for each usb pcie chipset.

Works really good, has a good chipset on it. Speed is as expected all ports work. Doesnt look bad and small enough to not block airflow to gpu.Major pro. Last one i had messed with the file structure saying i had 3 of everything i plugged in. I got this one because i wanted speed and did not want a stupid file path system. This works good.Cons:Ive had only 1 or 2 bugs where my computer had to re-reconize/it would disappear for a microsecond but that issue went away after a few days of use.Price

Only utilized for 1 day so far, but the card worked in my Supermicro board and allowed me to pass a USB controller to 3 separate VMs with no problems. No extra hoops to jump through.

You can find cheaper versions of USB 3.0 extension card but those are not stable like this card. Believe me this is based on my experience. I did purchase cheaper one and were happy when I move small amount of files and those cards are versatile to support both USB2.0 and 3.0. But when you bulk copy files between or among external HDDs it crashed. This card does not support USB2.0 but moving between and among system USB 2.0 port and 3.0 port goes well and finish the job. Meaning it is stable.

Works fine, no conflicts and none if the type-A plug fit problems as with the other version. Well constructed and solid, tech support was very responsive to my questions. Provides headers for my 4 front-panel connectors and 4 in the back on 4 channels. Expensive, but worth it in my case.

There are two options for this card, one with horizontal (to the card) USB ports, and one with ventricle. The horizontal arrangement can be installed in small cases or large cases, the vertical only in large cases. Unfortunately the one I chose had the horizontal arrangement that created issues with my case. This has been reported elsewhere.That said, the card is beautifully engineered with a heat sink and many electronic components not found on other cards to support the large power draw the card supports, and the bandwidth. It requires a driver for win 7 that was an easy install. But the USB port arrangement required that I return it before further assessment.Based on what looks like top scale enginering ONLY I would recommend the card but without performance and reliability proof to back it up.