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It looks like it is one, but dmidecode doesn’t show it.
# sudo dmidecode --type slot # dmidecode 3.4 Getting SMBIOS data from sysfs. SMBIOS 3.0.0 present. Handle 0x001C, DMI type 9, 17 bytes System Slot Information Designation: J6B2 Type: x16 PCI Express Current Usage: Available Length: Long ID: 1 Characteristics: 3.3 V is provided Opening is shared PME signal is supported Bus Address: 0000:ff:10.0 Handle 0x001D, DMI type 9, 17 bytes System Slot Information Designation: J6B1 Type: x1 PCI Express Current Usage: Available Length: Short ID: 2 Characteristics: 3.3 V is provided Opening is shared PME signal is supported Bus Address: 0000:ff:1c.4 Handle 0x001E, DMI type 9, 17 bytes System Slot Information Designation: J6D1 Type: x4 PCI Express Current Usage: Available Length: Long ID: 3 Characteristics: 3.3 V is provided Opening is shared PME signal is supported Bus Address: 0000:ff:1d.0 Handle 0x001F, DMI type 9, 17 bytes System Slot Information Designation: J7B1 Type: x1 PCI Express Current Usage: Available Length: Short ID: 4 Characteristics: 3.3 V is provided Opening is shared PME signal is supported Bus Address: 0000:ff:1c.5 Wrong DMI structures length: 3135 bytes announced, structures occupy 3136 bytes.