Realizing this is an old thread, I have to clarify for the benefit of those who may come along later that the Zalman ZM600-GV is NOT the same as the ZM HP series or GS/GT series. The GS/GT series units were Tier 3 while the HP was Tier 2. The GV is not likely to be a Tier 2 unit and is more probably a Tier 4 or 5 unit.