Hello,Hello. I have been using the card for about a week and haven't had ANY sleepmode incidents. This is new for me. Haven't run any speed test comparisons but it seems to be a bit faster than the aforementioned Beyimei card (that did have the sleepmode disconnection problem). Since I bought the card, it has been sold out at Amazon.es and price raised from 49.58 € to 80.31€.
Hello Maik,From the pictures the card seems to use a asmedia ASM3142 chipset in conjunction with a usb hub but no PCI-E switch. The ASM3142 only supports a PCI-E 3.0 x2 connection. The cMP only uses PCI-E 2.0 so you won't be able to use the full bandwidth, other than that tere might be a good chance the card will work without problems. Inateck cards got quite a good reputation for working in the cMPs. If you have teste your card please tell us weather it does work flawlessly or if there are problems with sleepmode or anyting else. There's a big collection of data about USB cards for the cMP in this thread: https://forums.macrumors.com/threads/usb-3-x-pcie-cards-for-classic-mac-pro.1501482/