Thanks for the info! Are you using the latest driver? There may also be an older driver with which the problem does not occur. Asus has 2 versions for Windows 10. Then again, the reviews are already very mixed and it is also quite possible that it is due to the hardware. Perhaps the driver from Realtek works a little better directly: http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=21&PFid=62&Level=5&Conn=4&DownTypeID=3&GetDown=false

No, you don't need any cables. Only a suitable connection on the PC. https://upload.wikimedia.org/wikipedia/commons/0/0c/PCI_und_PCIe_Slots.jpg

I can't say. I installed it in an ASUS P7P55D-E and it works perfectly with Win10. I had to reset a corresponding setting in the BIOS because of a conflict with IRQ.

yes, it fits. you have 3 pci-e x1 connectors