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Unreal Tournament 3 only stressed a single core heavily, while a second core worked at around 50%. This put the Phenom II X6 1100T at a disadvantage, remaining slower than the Core i5 750.
Company of Heroes: Opposing Fronts also stressed a single core, further confirming that this game is showing its age. Despite the apparent lack of multi-threading support, the Phenom II X6 processors, particularly the 1100T, provided tangible gains over the Phenom II X4 965.
Far Cry 2 is among the better examples of a game optimized for multi-core processors. That said, only one core is heavily utilized while two more cores work at over half their capacity and the remaining three do almost nothing. As a result, the Phenom II X6 processors offer performance comparable to the Phenom II X4 965.
Resident Evil 5 is the only game we tested that utilizes all six cores. When testing the Phenom II X6 CPUs, most cores were only used at ~50% of their capacity for an overall utilization level of around 60%. This put the six-core processors slightly ahead of their quad-core sibling, but they weren't quick enough to beat the Core i5 750.