- Feb 13, 2012
- Gigabyte Z390M Gaming
- RX 570
- Classic Mac
- Mobile Phone
That depends on what exactly you mean. Of the main CPUs only the latest feature USB3.1 Gen 2 on the Intel controller. Most in circulation prior to the Z390 have Gen 1. So motherboard manufacturers used add-on, 3rd-party, chips to provide the Gen 2 ports.Assuming the Gen 2 ports are on a different controller, that shouldn't be a problem should it? I thought the 15 port limit was per controller, not for the entire motherboard.
To follow through with your argument, some older Intel chipsets feature an XHCI controller as well as two EHCI controllers. That would add up to 45 ports. So clearly that's not the case.
Apple only uses the Intel controller and no 3rd-party "piggy-back' controllers like ASMedia and Renesas. So the 15-port limit is for those Intel ports. However, there is driver support for add-on PCI-e USB cards that might, for example, fit in a Mac Pro. Those are 3rd-party controllers that need 3rd-party drivers (you might have seen mention of CalDigital, NEC, ASMedia, Renesas etc). They don't feature in the 15.