AEBS Fast Ethernet vs Gigabit

Hi all, I have a fast ethernet AEBS-80211n and was wondering if there was much difference between mine and the newer gigabit version especially in airdisk speeds. Now im using it for time machine writing to the airdisk is painfully slow even over ethernet, I get:
7MB/s write over ethernet
10MB/s read over ethernet
2MB/s write 80211n (5GHZ)
5MB/s read 80211n (5GHZ)
Unfortunately its even slower when backing up with time machine, is the gigabit any faster?

There were some numbers posted in this thread of mine. I was actually looking for those 'n' numbers. Thanks!
http://discussions.apple.com/thread.jspa?threadID=1451409
They do seem a bit slow for wireless n. I've seen around 6 to 8 MB/s for the time capsule over wireless.

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