I have an all n network, aebs, macbook, imac and atv, setup as 5gHz n-only. Network utility shows my link speed as 300Mbit/s, however, I am transferring a large (about 7 gig) file from my macbook to my imac, and my output on iStat only shows 5MB/s at the max. I understand there is a difference from megabyte and megabit, but shouldn't my transfer rate be somewhat higher?