Just been reading EE times and it has an AMD exec stating that there are going to be double digit gains over the 2.66 Clovertown. It's a little difficult to work out which Chip will, so you can only hope it's the 2.3ghz Barcelona Spain and not a future 2.7
Anyway it's an interesting read as they demonstrated the Quad Core with a R600 combo (probably a AMD/ATI motherboard too).
Separately, AMD gave one of the first public demos of the R600, its next-generation graphics controller that uses 320 multiply-accumulate units. The company showed a Barcelona-based system using two 200W R600 graphics cards to hit a terabit/second benchmark.http://www.eetimes.com/news/latest/showArticle.jhtml?articleID=197700269
Also, anandtech have a very interesting article about the architecture of the K10, check it out here
Very interesting read indeed.