What mini Pci express Version is Omnia Turris using?

Omnia hardware Omnia HW tweaks
5
TO (hardware revision CZ11NIC20) output from `lspci -vkbDPPnn` 
0000:00:01.0 PCI bridge [0604]: Marvell Technology Group Ltd. Device [11ab:6820] (rev 04) (prog-if 00 [Normal decode])
        Device tree node: /sys/firmware/devicetree/base/soc/pcie/pcie@1,0
        Flags: fast devsel
        Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
        I/O behind bridge: None
        Memory behind bridge: None
        Prefetchable memory behind bridge: 00000000-000fffff [size=1M]
        Capabilities: [40] Express Root Port (Slot+), MSI 00
lspci: Unable to load libkmod resources: error -12

0000:00:02.0 PCI bridge [0604]: Marvell Technology Group Ltd. Device [11ab:6820] (rev 04) (prog-if 00 [Normal decode])
        Device tree node: /sys/firmware/devicetree/base/soc/pcie/pcie@2,0
        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
        I/O behind bridge: None
        Memory behind bridge: e0000000-e02fffff [size=3M]
        Prefetchable memory behind bridge: 00000000-000fffff [size=1M]
        Capabilities: [40] Express Root Port (Slot+), MSI 00

0000:00:03.0 PCI bridge [0604]: Marvell Technology Group Ltd. Device [11ab:6820] (rev 04) (prog-if 00 [Normal decode])
        Device tree node: /sys/firmware/devicetree/base/soc/pcie/pcie@3,0
        Flags: fast devsel
        Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
        I/O behind bridge: None
        Memory behind bridge: None
        Prefetchable memory behind bridge: 00000000-000fffff [size=1M]
        Capabilities: [40] Express Root Port (Slot+), MSI 00

0000:00:02.0/02:00.0 Network controller [0280]: Qualcomm Atheros QCA986x/988x 802.11ac Wireless Network Adapter [168c:003c]
        Flags: bus master, fast devsel, latency 0, IRQ 80
        Memory at e0000000 (64-bit, non-prefetchable)
        Expansion ROM at e8200000 [disabled]
        Capabilities: [40] Power Management version 2
        Capabilities: [50] MSI: Enable+ Count=1/8 Maskable+ 64bit-
        Capabilities: [70] Express Endpoint, MSI 00
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [140] Virtual Channel
        Capabilities: [160] Device Serial Number 00-00-00-00-00-00-00-00
        Kernel driver in use: ath10k_pci

According to the product brief for the 88F6820 it features:

  • PCIe 2.0 with 1 Port x4 + 2 Ports x 1 or 4 Ports x1
  • 6 SERDES lanes shared amongst PCIe/SGMII/QSGMII/SATA/sETM, e.g.

With PCIe 2.0 x1 the net throughput is 500 Mbyte/s in each direction, less the overhead for the transport protocol.