Jblk_U1, Jratio_U1: Base Clock Plus, Ratio Plus Connectors; Oc_Fs1: Oc Fail Save Button; Oc_Rt1: Oc Retry Button - MSI MEG Z490 GODLIKE Quick Start Manual

JBLK_U1, JRATIO_U1: Base clock Plus, Ratio Plus connectors

You can use these connectors to connect the external buttons. Press the button
connecting to JBLK_U1 to increase the CPU base clock or press the button connecting
to JRATIO_U1 to increase the CPU ratio.

OC_FS1: OC Fail Save Button

When you press this button, the system will be restarted and be forced into BIOS with
the previous setting and without showing the OC_FAIL message.

OC_RT1: OC Retry Button

When you press and hold this button, the system will keep retrying OC items until it
boot up successfully.
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Overview of Components
JBLK_U1 (Short the jumper to increase
the CPU base clock)
JRATIO_U1 (Short the jumper to increase
the CPU ratio)
OC_FS1
OC_RT1