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EVGA SR-3 DARK (160-CX-W999)
21. USB 2.0 Headers
The USB2.0 header is used to connect additional USB interface plugs to the
motherboard; these headers are most often used to connect the motherboard to
the chassis to enable the USB2.0 ports on the chassis. These will function the
same as the USB2 ports found on the motherboard's hardwired I/O hub, but
these can be used to attach to front panel USB, auxiliary ports that mount in the
card slots, and also some devices that directly connect to the header.
USB 2.0 standard is 500mA @ 5V per port (header total is 1000mA) for
unpowered devices. If your USB device requires more power than this, it is
recommended to attach a powered USB Hub.
22. Front Panel Audio Connector
This is a motherboard header, which is used to plug in the audio cable
originating from most PC chassis to allow audio to be recorded from or played
through the audio connectors on the chassis. This header has a connector that
looks similar to USB2 and will use the standard "HD Audio" jack. Some
systems may have two headers: one labeled HD Audio, and one labeled AC'97
– an AC'97 cable is not compatible with this header on the SR-3 DARK.
23. Front Panel Connectors
The Front panel connectors are the four main chassis connections. These
include the Power Switch, Power LED, Reset Switch, and HDD LED. The
Power and Reset switches are both designed to use "Momentary Switches,"
rather than "Latching Switches," which means the connection between the two
posts needs to be made just briefly for it to work, as opposed to being held in
place. This is why the Power and Reset switches can be triggered with a screw
driver by simultaneously touching the + and - posts.
Power LED will power on with the system, indicating the system is on and can
blink with CPU activity.
HDD LED will blink during access to the SATA ports; this is not activated for
M.2 SSDs.
24. Removable BIOS1 Chip
The ability to remove and replace the BIOS1 chip without requiring special
tools is a key feature on many of our boards, by adding a level of protection
against BIOS failures, bad BIOS flashes, BIOS corruption, etc. This feature also
allows EVGA to work with end-users if something happens to render the BIOS
chip unusable or a BIOS update is needed for CPU compatibility; rather than
replacing the whole board, Customer Support can send a pre-flashed BIOS chip
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