EVGA Classified SR-2 User Manual page 38

CPU Disable Jumper
For the ease of troubleshooting Dual CPUs or testing an individual CPU's
overclocking, EVGA has implemented two jumpers you can use to disable
individual CPUs. You don't need to remove any of your CPUs but simply
disable the particular CPU.
You see the location of the 2 jumpers in the above diagram. They are
located at the middle top of the Motherboard. In default shipping
configurations, all CPUs are enabled with the jumpers in the left position.
CPU0 Jumper is on top while CPU1 Jumper is below. To disable a CPU,
move the jumper over to the right position.
Example: Remove the Jumper cap of CPU0, CPU0 is disabled while CPU1
is enabled. The CPU Disable Function can also be extended onto the
EVGA Control Panel (ECP).
Do this when the PC is turned off, NOT while it is running!
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