Werewolf rented the 40Core Cluster and posted a review on Rybka Forum's The Edge. What first jumped out was that the Cluster has a small lag that weakens the Cluster at short time controls. So when he tried Cluster 40 cores v Houdini 1.5a in his Core i7 Overclocked to 3.6GHz/6GB RAM, Win 7 64 Bit/Tablebases on SSD, Houdini won 12-8 (3 min +1 sec, 20 game Nunn Suite).
Upping the time to 3 min + 4 sec allowed the Cluster to win +11 =6 -3, though.