Why does a 2-socket server show PCIe locations but the 4-socket server does not (how can I find the PCIe locations on the 4-socket server)?

I have two servers: - 2 socket Supermicro X9DBL-3F - 4 socket Supermicro X10QBI When I run hwloc-ls for the 2-socket server I see the PCIe topology with the HostBridges on each NUMANode, but the 4-socket server shows Packages instead of NUMANodes and all of the HostBridges are listed at the bottom. In addition, lscpu shows 2 NUMA nodes on the 2-socket but only 1 NUMA node on the 4-socket server. How can I discern which PCIe device is attached to which socket on the 4-socket server? When I run hwloc-ls on the 2-socket server I get the following:

Machine (63GB total)
  NUMANode L#0 (P#0 31GB)
    Package L#0 + L3 L#0 (20MB)
      L2 L#0 (256KB) + L1d L#0 (32KB) + L1i L#0 (32KB) + Core L#0
        PU L#0 (P#0)
        PU L#1 (P#16)
        ...
    HostBridge L#0
      PCIBridge
        PCI 17d3:1880
          Block(Disk) L#0 "sda"
  NUMANode L#1 (P#1 31GB)
    Package L#1 + L3 L#1 (20MB)
      L2 L#8 (256KB) + L1d L#8 (32KB) + L1i L#8 (32KB) + Core L#8
        PU L#16 (P#8)
        PU L#17 (P#24)
        ...
    HostBridge L#6
      PCIBridge
        PCI 8086:10fb
          Net L#8 "eth0"

... and when I run it on the 4-socket server I get the following:

Machine (126GB)
  Package L#0 + L3 L#0 (38MB)
    L2 L#0 (256KB) + L1d L#0 (32KB) + L1i L#0 (32KB) + Core L#0
      PU L#0 (P#0)
      PU L#1 (P#60)
      ...
  Package L#1 + L3 L#1 (38MB)
    L2 L#2 (256KB) + L1d L#2 (32KB) + L1i L#2 (32KB) + Core L#2
      PU L#4 (P#15)
      PU L#5 (P#75)
      ...
  Package L#2 + L3 L#2 (38MB)
    L2 L#4 (256KB) + L1d L#4 (32KB) + L1i L#4 (32KB) + Core L#4
      PU L#7 (P#30)
      PU L#8 (P#90)
      ...
  Package L#3 + L3 L#3 (38MB)
    L2 L#6 (256KB) + L1d L#6 (32KB) + L1i L#6 (32KB) + Core L#6
      PU L#10 (P#45)
      PU L#11 (P#105)
      ...
  Misc(MemoryModule)
  ...
  HostBridge L#5
    PCIBridge
      PCI 8086:10c9
        Net L#6 "ens8f0"

2-socket lscpu:

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                32
On-line CPU(s) list:   0-31
Thread(s) per core:    2
Core(s) per socket:    8
Socket(s):             2
NUMA node(s):          2
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 62
Model name:            Intel(R) Xeon(R) CPU E5-2450 v2 @ 2.50GHz
Stepping:              4
CPU MHz:               2804.841
CPU max MHz:           3300.0000
CPU min MHz:           1200.0000
BogoMIPS:              5000.25
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              20480K
NUMA node0 CPU(s):     0-7,16-23
NUMA node1 CPU(s):     8-15,24-31

4-socket lscpu:

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                120
On-line CPU(s) list:   0-119
Thread(s) per core:    2
Core(s) per socket:    15
Socket(s):             4
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 62
Model name:            Intel(R) Xeon(R) CPU E7-4890 v2 @ 2.80GHz
Stepping:              7
CPU MHz:               1199.953
CPU max MHz:           3400.0000
CPU min MHz:           1200.0000
BogoMIPS:              5600.25
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              38400K
NUMA node0 CPU(s):     0-119