A couple of thoughts come to mind here. First, VIA's P4X266 chipset has shown excellent memory performance with the Pentium 4 in initial testing, but seeing how the T-bird fares on the KT266A, the gap between the P4 and Athlon in this regard is closing rapidly. No doubt when used in combination with a Palomino Athlon, this chipset will use memory bandwidth very well. With the KT266A, a 1.4GHz Athlon looks to have a good chance to retake the performance crown from the 2GHz Pentium 4.
Second, I wonder how much room for improvement will be left for NVIDIA's nForce and it's DASP (quasi-L3 cache w/prefetch kinda thingy) with VIA's latest performing this well. Perhaps not much, I suspect.