EVGA Classified SR-2 - Manual (Page 46)

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From right to left, the CPU Disable jumpers will disable CPU0, CPU1. When
jumper is in top position, CPU is enabled. When in bottom position CPU is
disabled.
CPU VCore Booster
For convenience of users when overclocking, the ECP houses 2 CPU VCore
Boosters for real-time boost of CPU VCore. Each button boosts the VCore by
+0.1v to its respective CPU. The last or 3 rd button in line is a fan boost to
100% when depressed.
The red LED will light up when VCore booster is pressed. When one red LED
is lit, VCore is boosted by +0.1v for that CPU. When 2 red LEDs are lit, VCore
is boosted by +0.1v to both CPU’s. To disable the VCore boost, just press again
and VCore will go down to what you have set in the BIOS.
100% fan speed
The third button is the 100% fan speed button. When pressed it will run all
BIOS controlled fans at full speed effectively bypassing any automatic fan
control.