The person I replied to said price/performance, not efficiency. With the high end chips I think they're simply of the opinion that performance is more importan

The person I replied to said price/performance, not efficiency. With the high end chips I think they're simply of the opinion that performance is more important than efficiency (and I don't really pay attention to the lower range too much these days), and thus like most other high end desktop parts, they're all clocked as high as the chip and cooling can handle, even if dialing it back a little would drastically improve efficiency.