The price is also a lot higher.
With zalman's, watercooling, some coolermaster coppers, really such a need for slightly more heat dissipation is not at all worth the 70+ dollar difference, plus, the chance of losing it all to a snaped core. I havent bothered with amd after k6-III 400 as the chance of snapping my cpu was high and thats just a retarded design flaw. Finally, I think they are back into their senses.