Index: /trunk/src/VBox/Main/src-server/SystemPropertiesImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/src-server/SystemPropertiesImpl.cpp	(revision 82685)
+++ /trunk/src/VBox/Main/src-server/SystemPropertiesImpl.cpp	(revision 82686)
@@ -1453,6 +1453,7 @@
         NetworkAdapterType_I82545EM,
         NetworkAdapterType_Virtio,
+#ifdef DEBUG
         NetworkAdapterType_Virtio_1_0,
-        NetworkAdapterType_Am79C960,
+#endif
     };
     aSupportedNetworkAdapterTypes.assign(aNetworkAdapterTypes,