Will plugging a USB 2.0 lead into a PCI USB 3.0 card make all the ports USB 2.0 instead of USB 3.0? I think I heard this happens if you have a USB hub, but I'm not sure if it happens on a Pci usb card? cheers!
Huh? Well if I am understanding right - let me break it down:
Yes, USB will be as fast as the slowest part of the chain. Meaning USB3 -> USB2 Hub -> USB3 device will be running at USB2.0 speeds.
On the other hand, if you are got a USB3.0 card - it'll have support for USB3.0 for each of it's ports: USB3.0 -> USB2.0 device 1 and USB3.0 device 2 - will be both running at USB 3.0 speeds - except the USB 2.0 device.
If it is a PCI hub that connects to a USB header on the motherboard - then that might be a different story - but still follows suit about the slowest connection with in the chain still being that controls speeds.