The one BIG advantage I see for the K10 chips is temperature, at least for quad core. Currently, if you get an intel quad core you will have to get water cooling to even get it under 70-75 C under load (those temps are with good air towers). With their lower power requirements, Barcelonas will run a lot cooler. I imagine that will do a lot for processor lifetime as well. For hard-core enthusiasts this may or may not be an issue, but in, say, the OEM market I imagine there would be savings to be made from less expensive heatsinks, cheaper PSUs, and other peripherals, plus your computer wouldn't turn into a semi-portable heating unit. So I can see AMD having an advantage on that front in at least some markets.