Just got a new Zenith Extreme setup with AMD 1950x processor. Build is lightning fast, but is experiencing some strange USB connectivity issues. We use a secure USB hardware key that is checked by our software at various intervals. During certain testing, this is stressed a significant amount and are seeing both exponentially reduced performance as well as random errors and disconnects. This USB device is used by our company on a daily basis, as well as by thousands of our clients, without issue. We have a new AMD Ryzen machine with an equivalent ASUS ROG motherboard that is not experiencing these issues.
So far I have tried just about every available BIOS (0305, 0503, 0601, 9980, 9906, and 9910) to no avail. I've also tried installing a separate PCIe USB 3.0 card, but experience the same issue (interestingly enough, the card which is PCIe x1 would only work at all if it was in an x16 slot, not the x1 or the x4). Have also tried disabling all other USB ports except for those on the add-on card, but that didn't change anything either.
I've tried the fix that some people were seeing benefits from of disabling and removing 'useplatformclock' via bcdedit, with no change. I've contacted ASUS technical support, but all they seemed to be able to say was "Have you updated drivers, flashed the latest BIOS, and cleared the CMOS?", which I have. Their only other suggestion was to send the board in for repair.
Basically I'm kind of in a wait state right now, hoping it's a BIOS issue that will get patched (flashed 0601 this morning, but the issue persists), or that someone has experienced similar problems so it gets some traction with ASUS. Has anyone else experienced issues related to USB or PCIe expansion performance?