AMD representatives already stated that up to December the frequencies of barcelona processors will be increased to 2.5 GHz, and paired with passage to the new stepping B2 this can be considered as sufficiently rapid progress, The frequency will grow by 25%.
However, Let us note that the increase in speed from the passage to 2.5 GHz. ( from 2.0 frequency ) will result in raising the average level performance by 15%. You will agree that for the 25- percent frequency increase this is not so much.
, in addition, all depends on the type of utilized applications and testing conditions . For example, in some application the performance increase is more than 20%.