Lets take a look at a couple of reviews to see how these chips perform, AnandTech has tested all three of them, you can check out their review over here. The site concludes the Athlon II X3 lineup is an easy win and that the Phenom II X6 ranges from competitive with Lynnfield to a great value. The Phenom II X2 on the other hand is a great chip to tweak but uninspiring at stock clockspeeds.
The Phenom II X6 1100T at $265 is near the sweet spot for price/performance, and I'd say the 1090T at $235 is probably right at it. In many cases you get Lynnfield-like performance and in heavily threaded apps there's no comparison. Single threaded performance is still an Intel advantage, however the gap is narrowing. When the Phenom II X6 launched its price limited it to those users who needed tons of threads, the recent price drops have expanded its appeal.Legit Reviews also published a review of the Phenom II X6 1100T Black Edition, they conclude this new chip is a great hex-core processor that overclocks very well.
All in all, the AMD Phenom II X6 1100T is a great chip. Out of the box it does a great job, once you start pushing it above and beyond stock speeds is when the fun starts to happen. In order to hit 4.2GHz with the AMD Phenom II X6 1100T Black Edition all we had to do was increase the multiplier to x21 and bump up the core voltage a few notches. 4.3Ghz was nearly as simple. Though I will admit that I am a bit on the rusty side when it comes to black edition processors. Given a little more time and work I am certain that the AMD Phenom II X6 1100T Black Edition processor has more to offer!