Thanks to Th3M1ghtyD8, for telling us here, about the review he found here. There is also an interesting read on this here.
[COLOR=royalblue]"We have seen throughout our testing that were the enhanced level 2 cache is utilised the XP3000+ does indeed warrant its performance rating. The XP2800 despite running at a faster true speed is beaten by the XP3000+ in all of the real applications we tested, only losing out in the theoretical tests. When the XP3000+ is run at the same speed as the XP2800 the Barton core wins or is equal across the board. Although the performance gains are not a big as was hopped, the XP3000+ continues to improve on the Athlonís performance." [/COLOR]
More here, and comments here.