HKEPC reports about some of the changes in AMD's 65nm processors:
Previously, Athlon 64 X2 4000+/4400+/4800+ are based on 90nm Windsor with 1MB x2 L2 Cache. Now, the new re-release models are based on 65nm Brisbane with 512KB x2 L2 Cache. In addition, they are in 100MHz higher than the previous models. The new clock speeds are 2.1GHz, 2.3GHz and 2.5GHz respectively. All of them are in 65W TDP, no more 89W TDP version. And there is 65nm Athlon 64 X2 5000+ coming soon. This would be the same as 90nm Windsor version, but with a lower TDP to 76W.
Besides, the frequency multiplier for the upcoming 65nm products including AMD Athlon 64 FX, AMD Athlon X2 (Brisbane) and AMD Sempron (Sparta) have been changed to 0.5x. The integral multiplier limited a 200MHz (by Hyper-Transport Bus) separation between each existing model. The change of the multiplier could lower the separation to 100MHz, making the product line be more flexible. With regard to the change of frequency multiplier, the Brand ID Expansion has been increased from 8 bits to 16 bits with a new CPUID, so new BIOS is a must for supporting.