diff --git a/src/graph/rome_models.h b/src/graph/rome_models.h
index 4788fb2801..4b671b0119 100755
--- a/src/graph/rome_models.h
+++ b/src/graph/rome_models.h
@@ -96,6 +96,76 @@ static struct rcclRomeModel rome_model_33 = {
   .ringBase = "1 4 5 7 0 3 2 6|4 1 7 5 6 2 3 0",
 };
 
+static struct rcclRomeModel rome_model_30 = {
+  .nGpus = 8, .nCpus = 8, .nNics = 0, .nLinks = 2,
+  .gpuIds = { 0x43000, 0x23000, 0x26000, 0x3000, 0xe3000, 0xc3000, 0xc6000, 0x83000, },
+  .gpuNuma = { 1, 2, 2, 3, 4, 5, 5, 7, },
+  .nicNuma = { },
+  .connMatrix = { 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, },
+  .pattern = "0010201010200010",
+  .ringBase = "3 0 1 2 6 7 5 4|2 1 0 3 7 6 4 5",
+};
+
+static struct rcclRomeModel rome_model_32 = {
+  .nGpus = 8, .nCpus = 8, .nNics = 0, .nLinks = 2,
+  .gpuIds = { 0x43000, 0x23000, 0x26000, 0x3000, 0xe3000, 0xc3000, 0xc6000, 0x83000, },
+  .gpuNuma = { 1, 2, 2, 3, 4, 5, 5, 7, },
+  .nicNuma = { },
+  .connMatrix = { 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, },
+  .pattern = "0010201010200010",
+  .ringBase = "0 6 2 3 4 5 7 1|3 2 6 0 1 7 5 4",
+};
+
+static struct rcclRomeModel rome_model_24 = {
+  .nGpus = 8, .nCpus = 4, .nNics = 0, .nLinks = 2,
+  .gpuIds = { 0x43000, 0x23000, 0x26000, 0x3000, 0xe3000, 0xc3000, 0xc6000, 0x83000, },
+  .gpuNuma = { 0, 1, 1, 1, 2, 2, 2, 3, },
+  .nicNuma = { },
+  .connMatrix = { 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, },
+  .pattern = "10303010",
+  .ringBase = "0 1 2 3 5 7 6 4|1 0 3 2 7 5 4 6",
+};
+
+static struct rcclRomeModel rome_model_26 = {
+  .nGpus = 8, .nCpus = 4, .nNics = 0, .nLinks = 2,
+  .gpuIds = { 0x43000, 0x23000, 0x26000, 0x3000, 0xe3000, 0xc3000, 0xc6000, 0x83000, },
+  .gpuNuma = { 0, 1, 1, 1, 2, 2, 2, 3, },
+  .nicNuma = { },
+  .connMatrix = { 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, },
+  .pattern = "10303010",
+  .ringBase = "4 5 7 1 0 3 2 6|3 0 6 2 1 7 5 4",
+};
+
+static struct rcclRomeModel rome_model_23 = {
+  .nGpus = 8, .nCpus = 4, .nNics = 0, .nLinks = 2,
+  .gpuIds = { 0x43000, 0x23000, 0x26000, 0x3000, 0xc3000, 0xc6000, 0xa3000, 0x83000, },
+  .gpuNuma = { 0, 1, 1, 1, 2, 2, 3, 3, },
+  .nicNuma = { },
+  .connMatrix = { 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, },
+  .pattern = "10302020",
+  .ringBase = "1 7 6 4 5 2 0 3|2 5 3 0 4 6 7 1",
+};
+
+static struct rcclRomeModel rome_model_38 = {
+  .nGpus = 8, .nCpus = 7, .nNics = 0, .nLinks = 2,
+  .gpuIds = { 0x43000, 0x23000, 0x26000, 0x3000, 0xc3000, 0xc6000, 0xa3000, 0x83000, },
+  .gpuNuma = { 1, 2, 2, 3, 5, 5, 6, 7, },
+  .nicNuma = { },
+  .connMatrix = { 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, },
+  .pattern = "00102010002010",
+  .ringBase = "6 7 1 4 3 5 2 0|0 2 5 3 4 1 7 6",
+};
+
+static struct rcclRomeModel rome_model_28 = {
+  .nGpus = 8, .nCpus = 4, .nNics = 0, .nLinks = 3,
+  .gpuIds = { 0x43000, 0x23000, 0x26000, 0x3000, 0xc3000, 0xc6000, 0xa3000, 0x83000, },
+  .gpuNuma = { 0, 1, 1, 1, 2, 2, 3, 3, },
+  .nicNuma = { },
+  .connMatrix = { 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, },
+  .pattern = "10302020",
+  .ringBase = "0 3 2 1 4 5 6 7|7 6 5 4 1 2 3 0|0 2 5 7 4 6 3 1|1 3 6 4 7 5 2 0",
+};
+
 static struct rcclRomeModel romeTopoModels[] = {
   rome_model_22,
   rome_model_25,
@@ -103,4 +173,11 @@ static struct rcclRomeModel romeTopoModels[] = {
   rome_model_29,
   rome_model_31,
   rome_model_33,
-};
\ No newline at end of file
+  rome_model_30,
+  rome_model_32,
+  rome_model_24,
+  rome_model_26,
+  rome_model_23,
+  rome_model_38,
+  rome_model_28,
+};
diff --git a/src/graph/search.cc b/src/graph/search.cc
index b3589ff0c7..e6afe49a66 100644
--- a/src/graph/search.cc
+++ b/src/graph/search.cc
@@ -913,7 +913,7 @@ static ncclResult_t parseRomeSystem(struct ncclTopoSystem* system, struct rcclRo
   // number of GPUs and NICs on each numa node is used as first screening pattern
   for (int i = 0; i < romeTopo->nCpus; i++) {
     int g, n;
-    if (!getGpuNetCount(system, i, &g, &n, romeTopo->nNics, net_map)) return ncclSuccess;
+    getGpuNetCount(system, i, &g, &n, romeTopo->nNics, net_map);
     pattern[i*2] = '0' + g;
     pattern[i*2+1] = '0' + n;
   }
@@ -1036,10 +1036,15 @@ static ncclResult_t parseRome4P2H(struct ncclTopoSystem* system, struct ncclTopo
     //printf("No solution in %.2fms (%d iter)\n", t, time);
     return ncclSuccess;
   }
-  //printf("Solution in %.2fms (%d iter): ", t, time);
-  //for (int k = 0; k < ngpus; k++) printf("%d ", g[k]);
-  //printf("\n");
 
+  char line[1024];
+  sprintf(line, "Found matching Rome model index %d in %.2fms (%d iter) with GPU mapping: ", i, t, time);
+  int offset = strlen(line);
+  for (int k = 0; k < ngpus; k++) {
+    sprintf(line+offset, "%d ", g[k]);
+    offset = strlen(line);
+  }
+  INFO(NCCL_GRAPH, "%s", line);
   // create 4P2H based on reference and remapped ids
   NCCLCHECK(parseGraph(romeTopoModels[i].ringBase, system, graph, g, romeTopo.nNics, net_map));
   return ncclSuccess;
diff --git a/tools/scripts/topo_val.sh b/tools/scripts/topo_val.sh
index d20a849dcd..556c0f60b6 100755
--- a/tools/scripts/topo_val.sh
+++ b/tools/scripts/topo_val.sh
@@ -21,7 +21,7 @@
 
 DIR="$(cd -P "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
-for i in {0..37}
+for i in {0..38}
 do
 	$DIR/../topo_expl/topo_expl -m $i > "topo_m$i.log"
 	$DIR/../TopoVisual/topo_visual.sh -i "topo_m$i.log"
diff --git a/tools/topo_expl/models/topo_8p_rome_n2_1.xml b/tools/topo_expl/models/topo_8p_rome_n2_1.xml
index 0f965f7a3a..9edf0838ca 100644
--- a/tools/topo_expl/models/topo_8p_rome_n2_1.xml
+++ b/tools/topo_expl/models/topo_8p_rome_n2_1.xml
@@ -1,31 +1,72 @@
 <system version="2">
-  <cpu numaid="2" affinity="00000000,ffffffff,00000000,00000000" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
-    <pci busid="0000:c4:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
-      <pci busid="0000:c6:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
-        <gpu dev="0" sm="96" gcn="906" arch="38911" rank="0" gdr="1">
-          <xgmi target="0000:03:00.0" count="1" tclass="0x038000"/>
+  <cpu numaid="0" affinity="00000000,00000000,00000000,ffffffff" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
+    <pci busid="0000:41:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:43:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="0" sm="90" gcn="906" arch="38911" rank="0" gdr="0">
           <xgmi target="0000:26:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:03:00.0" count="1" tclass="0x038000"/>
         </gpu>
       </pci>
     </pci>
+    <pci busid="0000:62:00.0" class="0x020000" link_speed="5 GT/s" link_width="4">
+      <nic>
+        <net name="enp98s0f0" dev="0" speed="1000" port="0" guid="0x0" maxconn="65536" gdr="0"/>
+      </nic>
+    </pci>
+  </cpu>
+  <cpu numaid="1" affinity="00000000,00000000,ffffffff,00000000" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
+    <pci busid="0000:21:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:23:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="1" sm="90" gcn="906" arch="38911" rank="1" gdr="0">
+          <xgmi target="0000:c3:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:83:00.0" count="1" tclass="0x038000"/>
+        </gpu>
+      </pci>
+    </pci>
+    <pci busid="0000:24:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:26:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="2" sm="90" gcn="906" arch="38911" rank="2" gdr="0">
+          <xgmi target="0000:43:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:c6:00.0" count="1" tclass="0x038000"/>
+        </gpu>
+      </pci>
+    </pci>
+    <pci busid="0000:01:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:03:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="3" sm="90" gcn="906" arch="38911" rank="3" gdr="0">
+          <xgmi target="0000:43:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:c6:00.0" count="1" tclass="0x038000"/>
+        </gpu>
+      </pci>
+    </pci>
+  </cpu>
+  <cpu numaid="2" affinity="00000000,ffffffff,00000000,00000000" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
     <pci busid="0000:c1:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
       <pci busid="0000:c3:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
-        <gpu dev="1" sm="96" gcn="906" arch="38911" rank="1" gdr="1">
-          <xgmi target="0000:a3:00.0" count="1" tclass="0x038000"/>
+        <gpu dev="4" sm="90" gcn="906" arch="38911" rank="4" gdr="0">
           <xgmi target="0000:23:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:a3:00.0" count="1" tclass="0x038000"/>
+        </gpu>
+      </pci>
+    </pci>
+    <pci busid="0000:c4:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:c6:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="5" sm="90" gcn="906" arch="38911" rank="5" gdr="0">
+          <xgmi target="0000:26:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:03:00.0" count="1" tclass="0x038000"/>
         </gpu>
       </pci>
     </pci>
     <pci busid="0000:e1:00.0" class="0x020700" link_speed="16 GT/s" link_width="16">
       <nic>
-        <net name="mlx5_0" dev="0" speed="200000" port="1" guid="0x68ce600003da341c" maxconn="262144" gdr="1"/>
+        <net name="mlx5_0" dev="0" speed="200000" port="1" guid="0x20cd600003da341c" maxconn="262144" gdr="1"/>
       </nic>
     </pci>
   </cpu>
   <cpu numaid="3" affinity="ffffffff,00000000,00000000,00000000" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
     <pci busid="0000:a1:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
       <pci busid="0000:a3:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
-        <gpu dev="2" sm="96" gcn="906" arch="38911" rank="2" gdr="1">
+        <gpu dev="6" sm="90" gcn="906" arch="38911" rank="6" gdr="0">
           <xgmi target="0000:c3:00.0" count="1" tclass="0x038000"/>
           <xgmi target="0000:83:00.0" count="1" tclass="0x038000"/>
         </gpu>
@@ -33,45 +74,9 @@
     </pci>
     <pci busid="0000:81:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
       <pci busid="0000:83:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
-        <gpu dev="3" sm="96" gcn="906" arch="38911" rank="3" gdr="1">
-          <xgmi target="0000:a3:00.0" count="1" tclass="0x038000"/>
+        <gpu dev="7" sm="90" gcn="906" arch="38911" rank="7" gdr="0">
           <xgmi target="0000:23:00.0" count="1" tclass="0x038000"/>
-        </gpu>
-      </pci>
-    </pci>
-  </cpu>
-  <cpu numaid="1" affinity="00000000,00000000,ffffffff,00000000" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
-    <pci busid="0000:01:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
-      <pci busid="0000:03:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
-        <gpu dev="4" sm="96" gcn="906" arch="38911" rank="4" gdr="1">
-          <xgmi target="0000:c6:00.0" count="1" tclass="0x038000"/>
-          <xgmi target="0000:43:00.0" count="1" tclass="0x038000"/>
-        </gpu>
-      </pci>
-    </pci>
-    <pci busid="0000:24:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
-      <pci busid="0000:26:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
-        <gpu dev="6" sm="96" gcn="906" arch="38911" rank="6" gdr="1">
-          <xgmi target="0000:c6:00.0" count="1" tclass="0x038000"/>
-          <xgmi target="0000:43:00.0" count="1" tclass="0x038000"/>
-        </gpu>
-      </pci>
-    </pci>
-    <pci busid="0000:21:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
-      <pci busid="0000:23:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
-        <gpu dev="7" sm="96" gcn="906" arch="38911" rank="7" gdr="1">
-          <xgmi target="0000:c3:00.0" count="1" tclass="0x038000"/>
-          <xgmi target="0000:83:00.0" count="1" tclass="0x038000"/>
-        </gpu>
-      </pci>
-    </pci>
-  </cpu>
-  <cpu numaid="0" affinity="00000000,00000000,00000000,ffffffff" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
-    <pci busid="0000:41:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
-      <pci busid="0000:43:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
-        <gpu dev="5" sm="96" gcn="906" arch="38911" rank="5" gdr="1">
-          <xgmi target="0000:03:00.0" count="1" tclass="0x038000"/>
-          <xgmi target="0000:26:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:a3:00.0" count="1" tclass="0x038000"/>
         </gpu>
       </pci>
     </pci>
diff --git a/tools/topo_expl/models/topo_8p_rome_n4.xml b/tools/topo_expl/models/topo_8p_rome_n4.xml
new file mode 100644
index 0000000000..05a4197b18
--- /dev/null
+++ b/tools/topo_expl/models/topo_8p_rome_n4.xml
@@ -0,0 +1,85 @@
+<system version="2">
+  <cpu numaid="1" affinity="00000000,00000000,00000000,ffff0000" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
+    <pci busid="0000:41:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:43:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="0" sm="90" gcn="906" arch="38911" rank="0" gdr="0">
+          <xgmi target="0000:26:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:03:00.0" count="1" tclass="0x038000"/>
+        </gpu>
+      </pci>
+    </pci>
+  </cpu>
+  <cpu numaid="2" affinity="00000000,00000000,0000ffff,00000000" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
+    <pci busid="0000:21:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:23:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="1" sm="90" gcn="906" arch="38911" rank="1" gdr="0">
+          <xgmi target="0000:c3:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:83:00.0" count="1" tclass="0x038000"/>
+        </gpu>
+      </pci>
+    </pci>
+    <pci busid="0000:24:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:26:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="2" sm="90" gcn="906" arch="38911" rank="2" gdr="0">
+          <xgmi target="0000:43:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:c6:00.0" count="1" tclass="0x038000"/>
+        </gpu>
+      </pci>
+    </pci>
+  </cpu>
+  <cpu numaid="3" affinity="00000000,00000000,ffff0000,00000000" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
+    <pci busid="0000:01:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:03:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="3" sm="90" gcn="906" arch="38911" rank="3" gdr="0">
+          <xgmi target="0000:43:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:c6:00.0" count="1" tclass="0x038000"/>
+        </gpu>
+      </pci>
+    </pci>
+  </cpu>
+  <cpu numaid="5" affinity="00000000,ffff0000,00000000,00000000" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
+    <pci busid="0000:c1:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:c3:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="4" sm="90" gcn="906" arch="38911" rank="4" gdr="0">
+          <xgmi target="0000:23:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:a3:00.0" count="1" tclass="0x038000"/>
+        </gpu>
+      </pci>
+    </pci>
+    <pci busid="0000:c4:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:c6:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="5" sm="90" gcn="906" arch="38911" rank="5" gdr="0">
+          <xgmi target="0000:26:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:03:00.0" count="1" tclass="0x038000"/>
+        </gpu>
+      </pci>
+    </pci>
+  </cpu>
+  <cpu numaid="6" affinity="0000ffff,00000000,00000000,00000000" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
+    <pci busid="0000:a1:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:a3:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="6" sm="90" gcn="906" arch="38911" rank="6" gdr="0">
+          <xgmi target="0000:c3:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:83:00.0" count="1" tclass="0x038000"/>
+        </gpu>
+      </pci>
+    </pci>
+  </cpu>
+  <cpu numaid="7" affinity="ffff0000,00000000,00000000,00000000" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
+    <pci busid="0000:81:00.0" class="0x060400" link_speed="16 GT/s" link_width="16">
+      <pci busid="0000:83:00.0" class="0x038000" link_speed="16 GT/s" link_width="16">
+        <gpu dev="7" sm="90" gcn="906" arch="38911" rank="7" gdr="0">
+          <xgmi target="0000:23:00.0" count="1" tclass="0x038000"/>
+          <xgmi target="0000:a3:00.0" count="1" tclass="0x038000"/>
+        </gpu>
+      </pci>
+    </pci>
+  </cpu>
+  <cpu numaid="4" affinity="00000000,0000ffff,00000000,00000000" arch="x86_64" vendor="AuthenticAMD" familyid="143" modelid="49">
+    <pci busid="0000:e1:00.0" class="0x020700" link_speed="16 GT/s" link_width="16">
+      <nic>
+        <net name="mlx5_0" dev="0" speed="200000" port="1" guid="0x68ce600003da341c" maxconn="262144" gdr="1"/>
+      </nic>
+    </pci>
+  </cpu>
+</system>
diff --git a/tools/topo_expl/topo_expl.cpp b/tools/topo_expl/topo_expl.cpp
index 67323651bf..338e63b57e 100644
--- a/tools/topo_expl/topo_expl.cpp
+++ b/tools/topo_expl/topo_expl.cpp
@@ -92,7 +92,7 @@ NodeModelDesc model_descs[] = {
   {4, "topo_8p6l_6nic.xml",     "4 nodes gfx908 8P6L 6 NICs"},
   {1, "topo_8p_rome_n2.xml",    "single node 8 VEGA20 Rome NPS=2"},
   {4, "topo_8p_rome_n2.xml",    "4 nodes 8 VEGA20 Rome NPS=2"},
-  {4, "topo_8p_rome_n2_1.xml",  "4 nodes 8 VEGA20 Rome NPS=2 Alt. Model"},
+  {1, "topo_8p_rome_n2_1.xml",  "single node 8 VEGA20 Rome NPS=2 Alt. Model"},
   {1, "topo_8p_ts1.xml",        "single node 8 VEGA20 TS1"},
   {4, "topo_8p_ts1.xml",        "4 nodes 8 VEGA20 TS1"},
   {1, "topo_8p_ts1_1.xml",      "single node 8 VEGA20 TS1 Alt. Model"},
@@ -107,6 +107,7 @@ NodeModelDesc model_descs[] = {
   {4, "topo_4p3l_ia.xml",       "4 nodes 8 gfx908"},
   {4, "topo_8p_rome_n2_2.xml",  "4 nodes 8 VEGA20 Rome NPS=2 Alt. Model 2 NET/IF"},
   {4, "topo_8p_ts1_n4_2.xml",   "4 nodes 8 VEGA20 TS1 NPS=4 3 NET/IF"},
+  {1, "topo_8p_rome_n4.xml",    "single node 8 VEGA20 Rome NPS=4"},
 };
 
 int main(int argc,char* argv[])