EVGA 37062314 User Manual page 25

EVGA Z390 DARK (131-CS-E399)
35. SW Slow Mode Switch
This switch forces the CPU clock ratio to the lowest possible value (8.0 for
Coffee Lake-S CPU) in real-time. This can be helpful for benchmarking and
performance tuning, especially with extreme overclocking. Active Slow Mode is
indicated by a red LED near the switch. This is a hardware-based function and
does not need any BIOS settings or software to operate.
36. Rear Panel IO (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 16 for a
component level breakdown.
* There are two numeric references for PCI Express: one is mechanical, which is the
actual slot-length footprint, and the second is electrical, which is a reference of how
many PCIe lanes are routed to the slot.
As PCI Express is designed to be 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
different amounts of PCIe lanes, while some applications use only certain parts of a
card, such as compute apps that allow a card to run off of a single PCIe lane. 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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