ASROCK B550D4-4L User Manual page 14

No. Description
33 Thermal Sensor Header (TR1)
34 TPM-SPI Header (TPM_BIOS_PH1)
*If the FRNT_VGA1 header is in use, there will be no signal on the rear VGA port.
**For DIMM installation and configuration instructions, please see p.20 (Installation of Memory Modules
(DIMM)) for more details.
8