Is the Gig version really faster than the 100m version !?

I just upgraded my 100 meg AEBS to the new Gig version, and ran a quick n easy benchmark, an rsync -e ssh on a 150 meg file. The server is an iMac connected via gig-e, and the Macbook c2d is connected via 802.11n (reporting a consistant 300 mbps in network utility - about 20 feet from the router, going through 2-4 sheets of drywall). The tests were conducted in my Chicago apartment, with at least 10 detectable 2.4gHz networks, and no 5.8gHz networks that I know of.
The 802.11n 5.8gHz no backwards compatibility was by far the fastest. The fastest test I ran was 11 MBps on the copy, with 802.11a compatibility I believe was around 8, and 2.4ghz + 802.11g compatibility was around 6. I repeated all tests a few times, the results were pretty consistant.
These results suprised me, as I was really hoping for a bit faster. I could get 40 MBps on my Linux file server over gig-e to the iMac in previous tests. Unfortunately that machine is down until I get some replacement parts, so I couldn't use it to test the new AEBS. But I seem to remember getting 11 or 12 MBps with the Linux file server over the old AEBS with 100m and 5.8gHz no backwards compatiblity.
So how much of the performance non-difference is due to the iMac vs Linux file server, or the Gig-E version being no faster than the 100 meg version remains to be seen. I'm curious if anyone else has done tests.
If the router, or this 802.11n implementation is the bottleneck - folks may not want to waste their money upgrading, unless they really want that 4 port (in bridge mode) gig-e switch on the back.
Rob

That is somewhat counterintuitive, as the 802.11n connection speed is reportedly 300 mbps. I understand the implications of protocol overhead, but 70% overhead seems a bit excessive. I guess I'm curious if the bottleneck is:
- in the router backplane
- in the 802.11n protocol
- in apples implementation of 802.11(draft)n
Also - anyone else have actual benchmark data to share?
regards
Rob

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