Quoted from www.dailytech.com
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The desktop equivalent of Barcelona, codenamed Agena, is the 65nm flagship of AMD's next-generation desktop processors. Launch frequencies were quoted at "2.4 - 2.6GHz." Previous roadmaps had indicated Agena would debut at 2.7 to 2.9 GHz. Agena will have a 2MB L2 and 2MB L3 cache per CPU. AMD's internal guidance denotes this as a 125W TDP processor. As the flagship, Agena will be the first next-generation desktop launch and is scheduled for Q3'07.
Kuma, the dual-core mainstream next-generation desktop processor was quoted as having launch frequencies of "2.0 - 2.9GHz." Unlike the quad-core Agena processors, Kuma will feature 1MB of L2 and 2MB of shared L3 cache. Kuma will launch with both 89W and 65W TDP variants, but Energy Efficient models scheduled for 35W TDP will follow shortly after.
Rana, the next-generation Sempron successor codename, will launch with frequencies in the 2.1 to 2.3 GHz range. The dual-core CPUs will feature 1MB of total L2 cache, but no L3 cache. Rana's TDP is rated at 65W. Rana will not launch with the Agena flagship; AMD roadmaps have the processor launching at the same time as the Energy Efficient Kuma processors, or approximately Q4'07 if the launch schedule holds together.
As previously reported on DailyTech, Stars processors will use AM2+ motherboards. These processors can plug into existing AM2 motherboards today given the proper BIOS updates, but without the AM2+ sockets Stars processors will drop down to the HyperTransport 1.0 bus speeds.
AMD's Agena FX codename also appears to still exist on the roadmap. The only difference at this point between Agena and Agena FX is that Agena FX will use the Socket 1207+ interface.
Quoted from www.wikipedia.org:
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The Socket AM2+ is the immediate successor to Socket AM2 currently used in several AMD processors such as Athlon 64 X2, Socket AM2+ will be a mid migration from Socket AM2 to Socket AM3 and will be fully compatible with Socket AM2, so processors designed for Socket AM2 will work on Socket AM2+ motherboards and vice versa.
Socket AM2+ will have some differences however that will be used in AM2+ chips, there are two main features in Socket AM2+ not in Socket AM2:
* HyperTransport 3.0 operating at up to 2 GHz
* Advanced power features summarized as having split power planes, probably one for CPU Cores, and the other for the Integrated Memory controller (IMC), this will help for more advanced power management control.
AMD confirmed that AM2 processors will work in AM2+ motherboards and AM2+ processors will work on AM2 motherboards. However, due to the lack of support of HyperTransport 3.0 and separated power planes in Socket AM2 motherboards, AM2+ chips will be limited to the specifications of Socket AM2 (HyperTransport 2.0 at the speed of 1 GHz, one power plane for both Cores and IMC). AM2 chips will not benefit from faster HyperTransport and separated power planes on AM2+ motherboards as they do not support them, AM2+ motherboard then fall back to compatibility mode using AM2 specifications.
According to confirmations from AMD, Socket AM2+ will have compatibility path with Socket AM3, AM3 processors will work in AM2 motherboards; however, AM2 processors will not be compatible with AM3 motherboards.
Therefore, our existing mainboard still can support the next generation AMD CPU, if the manufacturer provide BIOS update. However, AM2 mainboards are using HyperTransport 2.0, while AM2+ or AM3 mainboards are using HyperTransport 3.0