FebSmart 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.

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

Using this for multiple webcams, no bandwidth problems, all controller showed up and working.

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

1. Single largest purchase disqualifier is resource contention and loss of functionality in other computer USB ports of *any* speed spec and it's not like I installed it in 15 year old hardware trying to eek out a few more years. MSI B450 Tomahawk for AM4. Before installing this card, wireless keyboard and mouse as well as many other concurrently-connected USB devices functioned normally and without fault. After installing this card, intermittent lockups of mouse movement and non-responsive keyboard were presented. In the "olden days" we'd chalk this up to IRQ issues -- remember the problems we had getting analog modems and serial mice to work together? This card resurrects those issues in a modern Windows 10 platform. This is an absolute deal-breaker and more than defeats the entire purpose of buying this card in the first place. 2. The sideways orientation of the external USB ports means standard USB plugs will literally scrape the sides of the slot opening in a standard mid-tower case (tried 2 different computers with 2 completely different cases). I'm not talking about just "brushing up against" the metal if it's positioned just right, I'm saying you will have to apply some pressure just to get it past the slot opening. THIS ASSUMES that the installed card is PERFECTLY ALIGNED WITH THE CASE OPENING. I couldn't even tighten the thumb screw that secures this card to the case UNTIL I HAD ALL THE INTENDED USB DEVICES CONNECTED. 3. Ships with drivers on compact CD that are... not kidding... 7 years older than the drivers Windows 10 installs by default (2012 v 2019). Don't install the drivers from the CD Steer clear of purchasing this card.