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Sure,
Fire up network utility (It's in your utilities folder) In the info screen, select en0, and look at your "Send" and "Recv" error counts.

On my iMac, the "Recv" error counts are the ones going up.
 
Alright, one last update while I await engineer's feedback:
Cloned the system drive in the imac to my macbook's, and guess what?
With this release, my macbook is unable to negotiate a gig link!

Something is seriously wrong with the release shipped with these macs...
 
Cloned the system drive in the imac to my macbook's, and guess what?
With this release, my macbook is unable to negotiate a gig link!

Something is seriously wrong with the release shipped with these macs...
aha! This is interesting, as I am awaiting my shiny new iMac. I'll post here whether it lets me get 1gbps.
 
Please do...

Heck, I'm tempted to drive over to a bestbuy and try it out with a switch I've got
 
My network util also reports 0 packet loss/error on my 100Mbps (eth0) connection...and as I've said before generally the connection is solid. So I'm inclined to agree that this is likely to be a software issue. Can't decide if I can face the unplugging, packing, driving to mac store and explaining problem scenario..... I can already hear the replies I might get "well its gigabit but only if you use switch x with firmware y with gold-plated cat200 cables...yada yada. ....just a guess, never owned a mac before but generally (in the UK at least) retailers/manufacturers rarely like to take responsbility for their products when they don't work as described...

TC
 
Made a trip to bestbuy, with one of my switches. Plugged it in and noticed it got a gig link right away. So, I ended up returning my iMac, replacement came in today, I'll let you know what happens when I plug it in after work.
 
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