Wait wat.. you just said P4 had no room to grow... but in fact it did, but it wasn't enough... and personally I see the same for BD or every other iteration of it. It has growth potential, but it will be never enough to match anything intel will offer as long as they stick to that.

Hell per core performanec on piledriver will be at the same level as deneb is now... and piledriver is still 6-9 month away...