None of those processors had anything like this.<p>The innovation of the UWM paper was the MDPT and DDST, then due to practical manufacture reasons merging them, and then studying the trade-off with a simulator to arrive at a very efficient system.<p>For comparison, here is the IBM patent for the bigger more expensive approach used in Power4:<p><a href="http:&#x2F;&#x2F;www.google.com&#x2F;patents&#x2F;US5615350" rel="nofollow">http:&#x2F;&#x2F;www.google.com&#x2F;patents&#x2F;US5615350</a>