Synthetic Performance
The SPECviewperf v10 tests seem to rely more on clock speed than the number of cores available. As a result the Phenom II X6 processors are slower than the Phenom II X4 in this test. The quad core part has a 200MHz clock speed advantage over the 1090T. This is a disappointing result considering that Turbo Core didn't help the Phenom II X6 processors here.
The CINEBENCH R11.5 benchmark tests both CPU and GPU performance. The Phenom II X6 1090T matched the Phenom II X4 965 for the GPU test and was considerably faster in the CPU test thanks the extra cores. Even the much lower clocked Phenom II X6 1055T beat the 3.4GHz Phenom II X4 965 when measuring the CPU performance, though it was slower than the Core i7 930.
Phenom II processors in general tend to struggle with WinRAR benchmarks. While the Phenom II X6 1090T was 17% faster than the Phenom II X4 965, it was only able to roughly match the Core i5 750.
The Povray v3.6 benchmark heavily favors the Phenom II X6 1090T allowing it to provide the best result we have seen in this test from a processor running at stock speeds. The Phenom II X6 1090T edged out both the Core i7 975 EE and Core i7 980 XE processors.
Interestingly, the Phenom II X6 1055T was significantly slower, much slower than its clock speed decrease should have allowed for. Despite this the 1055T was a fraction faster than the Core i7 750.