diff --git a/.github/workflows/pr-test.yml b/.github/workflows/pr-test.yml
index 794bcce19..727f2e2e9 100644
--- a/.github/workflows/pr-test.yml
+++ b/.github/workflows/pr-test.yml
@@ -791,34 +791,34 @@ jobs:
           cd test/srt
           python3 run_suite.py --suite per-commit-8-gpu-h200-deepseek-v32
 
-  # unit-test-backend-4-gpu-b200:
-  #   needs: [check-changes, unit-test-backend-2-gpu, sgl-kernel-build-wheels]
-  #   if: always() && !failure() && !cancelled() &&
-  #     ((needs.check-changes.outputs.main_package == 'true') || (needs.check-changes.outputs.sgl_kernel == 'true'))
-  #   runs-on: 4-gpu-b200
-  #   strategy:
-  #     fail-fast: false
-  #   steps:
-  #     - name: Checkout code
-  #       uses: actions/checkout@v4
+  unit-test-backend-4-gpu-b200:
+    needs: [check-changes, unit-test-backend-2-gpu, sgl-kernel-build-wheels]
+    if: always() && !failure() && !cancelled() &&
+      ((needs.check-changes.outputs.main_package == 'true') || (needs.check-changes.outputs.sgl_kernel == 'true'))
+    runs-on: 4-gpu-b200
+    strategy:
+      fail-fast: false
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
 
-  #     - name: Download artifacts
-  #       if: needs.check-changes.outputs.sgl_kernel == 'true'
-  #       uses: actions/download-artifact@v4
-  #       with:
-  #         path: sgl-kernel/dist/
-  #         merge-multiple: true
-  #         pattern: wheel-python3.10-cuda12.9
+      - name: Download artifacts
+        if: needs.check-changes.outputs.sgl_kernel == 'true'
+        uses: actions/download-artifact@v4
+        with:
+          path: sgl-kernel/dist/
+          merge-multiple: true
+          pattern: wheel-python3.10-cuda12.9
 
-  #     - name: Install dependencies
-  #       run: |
-  #         CUSTOM_BUILD_SGL_KERNEL=${{needs.check-changes.outputs.sgl_kernel}} IS_BLACKWELL=1 bash scripts/ci/ci_install_dependency.sh
+      - name: Install dependencies
+        run: |
+          CUSTOM_BUILD_SGL_KERNEL=${{needs.check-changes.outputs.sgl_kernel}} IS_BLACKWELL=1 bash scripts/ci/ci_install_dependency.sh
 
-  #     - name: Run test
-  #       timeout-minutes: 45
-  #       run: |
-  #         cd test/srt
-  #         python3 run_suite.py --suite per-commit-4-gpu-b200 --auto-partition-id 0 --auto-partition-size 1 --timeout-per-file 3600
+      - name: Run test
+        timeout-minutes: 45
+        run: |
+          cd test/srt
+          python3 run_suite.py --suite per-commit-4-gpu-b200 --auto-partition-id 0 --auto-partition-size 1 --timeout-per-file 3600
 
   unit-test-backend-4-gpu-gb200:
     needs: [check-changes, sgl-kernel-build-wheels-arm]
@@ -872,7 +872,7 @@ jobs:
         accuracy-test-2-gpu,
         unit-test-deepep-4-gpu,
         unit-test-deepep-8-gpu,
-        # unit-test-backend-4-gpu-b200,
+        unit-test-backend-4-gpu-b200,
         unit-test-backend-4-gpu-gb200,
       ]
     if: always()