EVGA SR-3 DARK (160-CX-W999)
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to get you up and running without requiring the end-user to send in the
motherboard. Please see the walkthrough on Page 137 for further information.
25. BIOS Selector Switch
This switch toggles between physical BIOS chips. This board has 2 BIOS chips
as a permanent fixture, and the other is a replaceable chip listed above. Each
chip holds only the settings and profiles that have been saved to the BIOS chip
while active. This allows you to swap between three physically different BIOS
chips. This also makes it substantially easier to hotflash a BIOS if needed. If
instructions are needed for hotflashing a BIOS, please contact EVGA Customer
Service (Page 148 for contact info).
26. CMOS Battery
The +3V CMOS battery backup provides uninterruptable power to the
BIOS/UEFI to keep all of the settings; otherwise, each boot would behave like
you just reset the BIOS. These batteries typically last several years and rarely
need to be replaced.
27. PCIe Disable Switches
These are DIP switches to physically disable power to a specific PCIe slot. By
default,
all switches are in the “On” position when “up”
. Move the switch
downwards to disable a specific slot. From right to left, the switches
correspond to PE1, PE2, PE3, PE4, PE5, and PE6. Switch 7 is disabled.
28. ProbeIt Header
The ProbeIt header is a means of live monitoring several different system
voltages in real-time with a multimeter. One terminal needs to connect to a
ground wire and the other to the specific you are trying to monitor. There are
two ProbeIt connectors: the left connector is J16, and the right connector is J5.
From left to right the function for the J16 connector: VCORE/Ground,
+1.8V/Ground, +1.05VA/Ground, +3.3VSTB/Ground, and
+12V_CPU/Ground.
From left to right the function for the J5 connector: VCCIN/Ground,
VDIMM_012/Ground, VDIMM_345/Ground, VSA/Ground, and
VCCIO/Ground.
29. PC Speaker
This is a small mono low-fidelity speaker permanently attached to the
motherboard used mainly for debugging purposes. A POST beep may indicate
