The new processors 5400+ and 5600+ use socket AM2 and increase the clock speed from 2.6 GHz of the 5000+/5200+ to 2.8 GHz. As previously, AMD uses different cache sizes for different performance ratings of its processors: The 5400+ has 1 MB L2 cache, the 5600+ 2 MB.
(source)While we do not have the performance numbers of the X2s yet, AMD feels confident enough to price the 5400+ and 5600+ right against the E6700. Intel's fastest mainstream processor currently lists for a tray-price of $530 (retail: $525), while AMD charges $485 for the 5400+ and $505 for the 5600+.
As much as we'd all like to see AMD being more competitive soon, this launch seems to be ridiculous.
The 5600+ is obviously a joke, and the 5400+ should be priced around 300$ to be taken seriously...