diff --git a/tests/3DPrimary.spec.ts b/tests/3DPrimary.spec.ts
index 5bd2e3f6784..cc251ca4acf 100644
--- a/tests/3DPrimary.spec.ts
+++ b/tests/3DPrimary.spec.ts
@@ -24,10 +24,13 @@ test.describe('3D primary Test', async () => {
 
     await attemptAction(() => reduce3DViewportSize(page), 10, 100);
     await waitForViewportsRendered(page);
-    await checkForScreenshot(
+    await checkForScreenshot({
       page,
-      viewportPageObject.grid,
-      screenShotPaths.threeDPrimary.threeDPrimaryDisplayedCorrectly
-    );
+      locator: viewportPageObject.grid,
+      // Volume-3D ray-cast output is GPU/driver-noisy run-to-run; match the
+      // tolerance already used by the sibling 3DOnly test.
+      maxDiffPixelRatio: 0.04,
+      screenshotPath: screenShotPaths.threeDPrimary.threeDPrimaryDisplayedCorrectly,
+    });
   });
 });