Industry sources reveal that AMD would be branding its Kuma dual-core processor as Athlon X2 7000 series. These processors are aimed to compete with Intel's Core 2 Duo E7000 series processors. Kuma continues to use the 65nm SOI fabrication process. The core sports 512 KB L2 cache per core, and a shared 2 MB L3 cache. Surprisingly, despite having sub-3.00 GHz clock speeds, the processors have rated TDP of 95W.

These processors use a broader 3600 MT/s HyperTransport interface, and feature DDR2 memory controllers that support the PC2-8500 (1066 MHz) standard. As for the models, the Athlon X2 7550 has a clock speed of 2.50 GHz, and an FSB multiplier of 12.5x. The Athlon X2 7750 comes with the clock speed of 2.70 GHz, and a FSB multiplier of 13.5x. Both processors are expected to be out by Q1 2009.

Phenom X2 is intended to be the latest dual-core processor from AMD. It is based on the newer K10 architecture. The 65nm Kuma core is what sits inside the first to release models of the Phenom X2. Although based on K10 architecture and Kuma core, the initial batch being 65nm, AMD for some reason chooses to call it Athlon X2 saving the Phenom brand name perhaps for the 45nm batches? At least the sample Expreview got had the Athlon X2 etching on it. The chip carried the "AD6500" label and came with a 2.30 GHz clock speed.

Here's something to ponder: 6500 isn't a performance rating, it is just a model number. The Athlon 64 X2 6400+ had a 3.20 GHz clock speed. As performance evaluations will soon show, the Phenom/Athlon 6500 isn't anywhere close to the performance of the X2 6400+. However, architectural improvements meant that Kuma outperforms Brisbane (K8, 65nm) on a clock to clock basis. To ascertain this, Expreview used a Athlon 64 X2 5000+ Black Edition (Brisbane) that was underclocked to 2.30 GHz, the clock speed which AD6500 comes with. Super Pi 1M benchmark was run. While the Brisbane chip crunched it in 39.374 s, Kuma did it in 33.43 s indicating a performance increment of roughly 15%. The test-bed consisted of a NVIDIA nForce 750a SLI motherboard and GEIL 1GB DDR2-800 memory. Kuma AD6500 comes with a shared L3 cache of 2 MB apart from dedicated L2 caches of 512 KB per core. It uses a broader HyperTransport 3.0 system interface at 3600 MT/s. It supports DDR2-1066.

Time draws closer for the Athlon 64 X2 to retire. It has seen its good and bad days, leading Intel versus the Pentium D and trailing it versus the Core 2 Duo. German site Hardware Infos shed light on the primary lineup of the dual-core edition based on the K10 architecture, the Phenom X2. There are no core architectural changes for the Phenom X2, codenamed "Kuma" over the K8, except that like the Phenom X3 and X4, these chips feature 2 MB of L3 cache apart from 512 KB caches per core and the revised HyperTransport interface. The listed models come at a rated TDP of 45W. The first three Kuma chips listed have clock-speeds ranging from 1.90 GHz to 2.30 GHz and have been given model numbers that look confusing to the older PRN system AMD employed, with the top Athlon 64 X2 rated at 6400+. The later releases of the older X2 using the Brisbane core broke away from the older PRN and we saw models such as 4450e, 4850e or 4850b (note the absence of the "+").

The naming of these chips asserts that. For example, the 1.90 GHz Kuma part is named Phenom X2 GE-6400. Going by the performance evaluations of other parts based on the K10 architecture, at 1.90 GHz + the 2 MB L3 cache, this part might not be on par with the Windsor core Athlon 64 X2 6400+. Contradicting earlier reports that AMD would work out Kuma parts on the 45 nm fabrication process, all three Kuma parts reported are based on the 65 nm fab process.