diff --git a/tests/kernels/moe/test_moe_layer.py b/tests/kernels/moe/test_moe_layer.py
index 14cfd00c2bdd..07c04a168026 100644
--- a/tests/kernels/moe/test_moe_layer.py
+++ b/tests/kernels/moe/test_moe_layer.py
@@ -1620,13 +1620,18 @@ def _parallel_worker(
             else:
                 print("F", end="")
         finally:
-            # DeepEP managers are not reliably reusable across many subtests in
-            # a single worker process. Tear them down after each DeepEP case so
-            # later subtests do not inherit stale communication state.
-            if test_config.backend in {
-                "deepep_low_latency",
-                "deepep_high_throughput",
-            }:
+            # Note: for some reason DeepEP buffers don't seem to be
+            # entirely reusable on B200. In order to work around this
+            # we clear the all2all manager's cache after each testpoint.
+            cap = current_platform.get_device_capability()
+            if (
+                cap is not None
+                and cap.major == 10
+                and (
+                    test_config.backend == "deepep_low_latency"
+                    or test_config.backend == "deepep_high_throughput"
+                )
+            ):
                 torch.accelerator.synchronize()
                 all2all_manager = get_ep_group().device_communicator.all2all_manager
                 if all2all_manager is not None: