The first Phenom II chips were introduced last month. The processors are manufactured using a 45-nanometer process.

The new additions include the quad-core Phenom II X4 910, which runs at 2.6GHz with 8MB of cache, and the 800-series quad-core processors, which run at between 2.5GHz and 2.6GHz and have 6MB of cache. Pricing for only one of those chips was available, the X4 810 at 2.6GHz, which costs US$175.

The triple-core processors are new to the Phenom II lineup. The X3 720 runs at 2.8GHz and the X3 710 runs at 2.6GHz, and both have 7.5MB of cache. They are priced at $145 and $125, respectively. The triple-core processors are quad-core chips with one of the cores disabled, Schwarzbach said.

Tweaks in the core and cache allow AMD to offer more performance at similar price points to its earlier chips, McCarron said.