From what I've read/heard - AMD are selling every chip they can make. So whatever the highest test the chip passes, it's sold as that. This is apparently why

From what I've read/heard - AMD are selling every chip they can make. So whatever the highest test the chip passes, it's sold as that. This is apparently why nobody is having much luck getting any kind of overclocking beyond the on-box specs - AMDs just very good at ensuring chips go where they're required.