diff --git a/projects/rccl/src/graph/topo.h b/projects/rccl/src/graph/topo.h
index d45125fc42..f9e9ec5a7e 100644
--- a/projects/rccl/src/graph/topo.h
+++ b/projects/rccl/src/graph/topo.h
@@ -21,9 +21,9 @@
 #define SKL_CPUPCI_WIDTH 12
 #define P9_WIDTH 32
 #define NET_WIDTH 12           // 100Gbit
-#define ROME_QPI_WIDTH 24
-#define ROME_PCI_WIDTH 24
-#define ROME_CPUPCI_WIDTH 24
+#define ROME_QPI_WIDTH 18
+#define ROME_PCI_WIDTH 18
+#define ROME_CPUPCI_WIDTH 18
 
 // Intel CPU convert GPU P2P traffic into 64B PCI TLPs, to GPU
 // to GPU traffic consumed more PCI bandwidth.
diff --git a/projects/rccl/tools/topo_expl/topo_expl.cpp b/projects/rccl/tools/topo_expl/topo_expl.cpp
index 2d939bfed3..2151e6b4fc 100644
--- a/projects/rccl/tools/topo_expl/topo_expl.cpp
+++ b/projects/rccl/tools/topo_expl/topo_expl.cpp
@@ -106,7 +106,7 @@ int main(int argc,char* argv[])
   NetDevices nic_2(2, netPciPaths_2, netGuids_2, netPciNumaIds_2);
 
   // CPU, GPU and NIC devices on Rome
-  CpuDevices rome("Rome", 24, 24, 24);
+  CpuDevices rome("Rome", 18, 18, 18);
   GpuDevices vg20_pcie_rome(8, rome_busIds_8, rome_gpuPciPaths_8, rome_gpuPciNumaIds_8, conn_mat_rome);
   NetDevices nic_1_rome(1, rome_netPciPaths_1, rome_netGuids_1, rom_netPciNumaIds_1);
   NetDevices nic_2_rome(2, rome_netPciPaths_2, rome_netGuids_2, rom_netPciNumaIds_2);