diff --git a/docs/contributor/validator.md b/docs/contributor/validator.md
index 78d1a2973..66459e56b 100644
--- a/docs/contributor/validator.md
+++ b/docs/contributor/validator.md
@@ -692,7 +692,8 @@ silently fall back.
 
 Full list (defaults, semantics) is in the `validators/performance`
 package godoc. NCCL variants exposed today: `nccl-all-reduce-bw`,
-`nccl-all-reduce-bw-net`, `nccl-all-reduce-bw-nvls`. Inference:
+`nccl-all-reduce-bw-net`, `nccl-all-reduce-bw-nvls`. Opt-in CRE NCCL
+for EKS H100: `nccl-cre-all-reduce-bw`. Inference:
 `inference-perf` (Dynamo + AIPerf).
 
 > **Constraint-name contract.** Each NCCL variant looks up a
diff --git a/docs/user/validation.md b/docs/user/validation.md
index bed2f8405..52fae8031 100644
--- a/docs/user/validation.md
+++ b/docs/user/validation.md
@@ -53,6 +53,15 @@ ones) that match the target fabric:
 | `nccl-all-reduce-bw-net` | NET (EFA on EKS by default; ConnectX RoCE via `AICR_NCCL_FABRIC=roce`) | GB200 + EKS. Asserts EFA actually carried traffic — catches silent fallback to Socket when the NVIDIA driver is missing `NVreg_GrdmaPciTopoCheckOverride=1`. |
 | `nccl-all-reduce-bw-nvls` | NVLS (MNNVL across an NVL72 IMEX domain) | GB200 + EKS, and GB200 + OKE. Asserts the NVLS communicator actually initialized — catches silent fallback to EFA (EKS) or Socket (OKE) when the IMEX domain is misconfigured. |
 
+An opt-in Cluster Readiness Engine (CRE) NCCL check is available for EKS H100.
+It is not attached to shipped overlays while CRE remains private and the
+result has not been correlated with the TrainJob path. The check requires a
+same-named constraint:
+
+| Check | What it measures |
+|---|---|
+| `nccl-cre-all-reduce-bw` | EFA bus bandwidth from a CRE `WorkloadRun` `BandwidthMeasurement`; AICR still asserts the transport from launcher logs |
+
 The applicability column is the *default*, derived from the recipe's
 `criteria`. A recipe whose criteria fall outside it can still run these
 benchmarks explicitly — either by
diff --git a/pkg/validator/catalog/catalog_test.go b/pkg/validator/catalog/catalog_test.go
index 478f05223..298c37a56 100644
--- a/pkg/validator/catalog/catalog_test.go
+++ b/pkg/validator/catalog/catalog_test.go
@@ -1162,6 +1162,22 @@ func TestEmbeddedCatalog_NCCLAllReduceBWNetEntryExists(t *testing.T) {
 	t.Fatalf("no embedded catalog entry named %q (AICR_NCCL_FABRIC forwarding would silently no-op)", v1.NCCLAllReduceBWNetCheckName)
 }
 
+func TestEmbeddedCatalog_CRENCCLAllReduceBWEntryExists(t *testing.T) {
+	cat, err := LoadWithDataProvider(context.Background(), nil, "v0.0.0-next", "")
+	if err != nil {
+		t.Fatalf("Load failed: %v", err)
+	}
+	for _, v := range cat.Validators {
+		if v.Name == v1.CRENCCLAllReduceBWCheckName {
+			if v.Phase != "performance" {
+				t.Errorf("%q phase = %q, want performance", v1.CRENCCLAllReduceBWCheckName, v.Phase)
+			}
+			return
+		}
+	}
+	t.Fatalf("no embedded catalog entry named %q", v1.CRENCCLAllReduceBWCheckName)
+}
+
 func TestCatalogEmbedding(t *testing.T) {
 	// Simulate embedding in a CR spec
 	type ValidatorCatalogSpec struct {
diff --git a/pkg/validator/v1/job_plan_internal.go b/pkg/validator/v1/job_plan_internal.go
index b86678277..274e38e4b 100644
--- a/pkg/validator/v1/job_plan_internal.go
+++ b/pkg/validator/v1/job_plan_internal.go
@@ -59,6 +59,12 @@ const (
 	// would otherwise silently no-op RoCE forwarding with no test failing.
 	NCCLAllReduceBWNetCheckName = "nccl-all-reduce-bw-net"
 
+	// CRENCCLAllReduceBWCheckName is the catalog name of the CRE-driven NCCL
+	// all-reduce check (WorkloadRun). Overlays opt in by listing this check and
+	// a same-named performance constraint. It is limited to EKS H100 while CRE
+	// integration is validated, and no embedded overlay enables it.
+	CRENCCLAllReduceBWCheckName = "nccl-cre-all-reduce-bw"
+
 	// ncclFabricEnv selects the NET fabric (efa default | roce). Forwarded to
 	// the NET check pod so the in-Job validator can observe it. This is the
 	// orchestrator (forwarding) end; the validator-pod (reading) end defines the
diff --git a/recipes/validators/catalog.yaml b/recipes/validators/catalog.yaml
index 956267042..448241274 100644
--- a/recipes/validators/catalog.yaml
+++ b/recipes/validators/catalog.yaml
@@ -286,3 +286,13 @@ validators:
     timeout: 30m
     args: ["nccl-all-reduce-bw-nvls"]
     env: []
+  # CRE-driven EKS H100 NCCL check. Opt-in only: no embedded overlay
+  # references this check while CRE remains private and correlation with
+  # the TrainJob path is incomplete.
+  - name: nccl-cre-all-reduce-bw
+    phase: performance
+    description: "Verify EKS H100 NCCL All Reduce Bus Bandwidth via a Cluster Readiness Engine WorkloadRun"
+    image: ghcr.io/nvidia/aicr-validators/performance:latest
+    timeout: 30m
+    args: ["nccl-cre-all-reduce-bw"]
+    env: []