Overall, the performance numbers for the new-generation triple-core AMD processors are at a pretty expected level. According to SYSMark 2007, Phenom II X3 720 performs about as fast as quad-core Phenom II X4 810 with 200MHz lower clock speed and 2MB smaller L2 cache. The loss of one of the cores causes a serious performance drop only in one single test scenario aka VideoCreation devoted to digital content creation and processing.
At the same time, dual-core Intel competitors cope with this task as well as their triple core rivals. The top Phenom II X3 720 model loses to Core 2 Duo E8400 as well as to Core 2 Duo E7500. It only catches up with Core 2 Duo E7400. So, SYSMark 2007 doesn’t allow us to conclude that an extra core in AMD processors can actually make up for the higher computational efficiency and higher clock speeds of the dual-core Intel solutions.