It is already known , that the expansion of 65 nm dual core processors athlon 64 X2 began from the elder models of type athlon 64 X2 5000+ (2.6 GHz) and Athlon 64 X2 4800+ (2.5 GHz), which dont have popularity among overclocker due to the relatively high prices.Actually, the amateurs of overclock prefer to buy the low-end models of this family, and then overclock them to the level at which they are already capable of competing with the elder models. The core brisbane do not have many low-end processors ,except the athlon 64 X2 3600+ (1.9 GHz) witch was prescribed in the official Price- list AMD, after engaging equal price position with Athlon 64 X2 3800+.
As we could be convinced, the processors brisbane with variable success can reach the frequency 2.9-3.0 GHz and sometimes a little above. we should recognize that also 90 nm core windsor with the passage on stepping F3 demonstrate progress in the overclocking potential; therefore new 65 nm technical process do not bring A64 any benifint from side frequency range . However, 65 nm processors brisbane have another advantage witch is the lower heat.
On the pages of forum xtremeSystems one member showed the processor athlon 64 X2 4000+ on 65 nm core brisbane. This cpu has 65 w TDP value and it box appear in the next photo:
Processor has marking form ADO4000IAA5DD, concrete copy was released on the first week of 2007. In the default rating of processor athlon 64 X2 4000+ is the frequency 2.1 GHz with voltage 1.325 v, cache volume in the second level is equal to 2 X 512 KB.
Inscription on the HIS of processor sequential time reminds that this core are released in Germany and collected in Malaysia. So this processor with the increased to 1.52 v voltage succeeded to get in 3098 MHz frequency; however, this operating mode was not characterized by stability. This result was with default amd cooler , after all the user set the HT multiplier to 3x, with vcore 1.512 v and it obtained the frequency of 2888 MHz, at which the processor preserved stability under load .
We can not take this overclock result as reference. But in next days will be more overclocking result of the low-end models brisbane and we can then check the overclocking potential os such cpu..