EVGA Z390 FTW User Manual page 19

EVGA Z390 FTW (123-CS-E397)
USB 3.1 Gen1 standard is 900ma @ 5V for unpowered devices. If your USB
device requires more power, it is recommended to attach a powered USB Hub.
USB 3.1 Gen2 Type-A (found on the I/O Hub) shares the power limit of USB
3.1 Gen1 at 900ma @ 5V.
Note: USB 3.1 Gen1 is more commonly referred to as USB 3.0.
28. Rear Panel Connectors (Figure 2)
This is the section referred to as the I/O Hub. This panel contains the
hardwired USB, Sound, and Ethernet connections. Please see Page 12 for a
component level breakdown.
* There are two numeric references for PCI-Express: one is mechanical (the actual slot-
length footprint across the motherboard), while the second is electrical (the number of
PCIe lanes available to the slot from the CPU, PCH, or both).
PCI Express was designed with a universal architecture; you can install x1 cards,
such as sound cards or USB controllers, into an x16 slot. Many types of cards
can use various numbers of PCIe lanes; similarly, some applications might only
use certain parts of a card (e.g. compute apps), requiring only a single PCIe lane
to accomplish its task without affecting performance. This is why there are x16
mechanical slots with an x1 electrical PCIe lane. Using the entire length of a
PCIe slot is unnecessary, nor does it cause an adverse effect to use a shorter
form-factor bus card in a slot that physically can hold a larger form-factor bus
card.
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