AnandTech, Guru3D, HotHardware, TechSpot, Hardware Secrets, OCC and THG published their reviews on the new Phenom II X6 6-core processor. Here's an excerpt:

he performance of the new AMD Phenom II X6 1090T needs to be looked at not only in raw numbers but as a whole product. While clock for clock, speed for speed, the Intel i7 980X brings the 1090T to its knees, but if you factor in the costs of each one and the price to performance ratio then they start to equal out. The current pricing for the Intel 980X is about $999 just for the processor and when released the Phenom II X6 1090T will cost only around $285 which is almost a quarter of the price of the 980X. For that price, you could also add all of the components of the Leo Platform including the motherboard and a 5800 series graphics card, so comparing apples to apples is fine if the apples cost the same. If you look at the price per core, the AMD Phenom II X6 1090T calculates to about $50 per core versus about $166 per core for the Intel i7 980X. Disable all but two of the Intel cores and run the tests and I bet that the AMD Phenom II X6 price for price will take away the competition.

When it comes to gauging the performance among similarly priced processors, the six cores of the 1090T start to shine. When benchmarked, the 1090T was able to keep up or beat the majority of the quad core processors and even topped the 980X a few times. If you compare it to its Phenom II counter parts, then this is a major step up from the quad cores such as the Phenom II X4 965. Also compared to some of the higher end Intel Quad Cores, the Phenom II X6 1090T shows improvement. When it came to overclocking, especially with the unlocked "Black Edition" multiplier, the Phenom II X5 1090T was quite simple. Just find the maximums that you can remain stable at with the correct voltage and you are good to go. Overall I was quite happy with the performance of the Phenom II X6 1090T especially when it came to multi-threaded applications, which is what this processor was designed for. While not a ground breaker like the Intel i7 980X, it is not a wallet breaker either. For the price that the Phenom II X6 1090T is going to retail for, you would be a fool not to pick one up for your next AMD build or upgrade.

Pros:
* Six processing cores
* Turbo Core technology
* Under $300
* Part of new "Leo Platform"
* HyperTransport 3.0
* Pricing

Cons:
* Slower then the Intel 980X when compared core for core