Index: /trunk/src/VBox/ValidationKit/testmanager/core/testboxcontroller.py
===================================================================
--- /trunk/src/VBox/ValidationKit/testmanager/core/testboxcontroller.py	(revision 61260)
+++ /trunk/src/VBox/ValidationKit/testmanager/core/testboxcontroller.py	(revision 61261)
@@ -395,4 +395,6 @@
         # Update the row in TestBoxes if something changed.
         #
+        cPctScratchDiff = (cMbScratch - oTestBox.cMbScratch) * 100 / oTestBox.cMbScratch;
+
         # pylint: disable=R0916
         if   self._sTestBoxAddr != oTestBox.ip \
@@ -409,5 +411,5 @@
           or fChipsetIoMmu      != oTestBox.fChipsetIoMmu \
           or cMbMemory          != oTestBox.cMbMemory \
-          or cMbScratch         != oTestBox.cMbScratch \
+          or abs(cPctScratchDiff) >= min(4 + cMbScratch / 10240, 12) \
           or sReport            != oTestBox.sReport \
           or iTestBoxScriptRev  != oTestBox.iTestBoxScriptRev \