@armsby:
That did not help, everything has been disabled, still only about 220-300Mbps and cpu load not over 50%
With HT disabled you're fully tapping a core at 50% (which you might see as 70/30, 50/50, 90/10, etc.). I'm still going to go with that's the cap for a 330, particularly since that's the same cap I hit a few years back.