EVGA 141-LF-E658 - Manual (Page 26)

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Jumper Settings
PCIE Disable Jumper
For the ease of troubleshooting Multiple Video Cards, or testing individual
Video Card’s Overclocking, EVGA has implemented 3 Jumpers you can
use to disable individual PCIE slots. You don’t need to remove any of your
video cards but simply disable the slot the particular card is in and the
Motherboard will treat it as invisible.
The PCIe disable jumpers are located right beside the 24pin ATX
Connector. In default shipping configurations, all slots are enabled with the
jumpers in the left position. From top to bottom, PCIE slots 1,2,3
respectively. To disable a PCIE Slot, move the jumper over to the right
position.
Example: Remove the Jumper cap of JPE2, PCIE Slot 2 is disabled while
the rest are enabled. The PCIE Disable Function can also be extended onto
the ECP discussed later on.
Do this when the PC is turned off, NOT when it is running!