Mac mini ethernet speeds cut in half by snow leopard?

I upgraded an old mac mini (2,1) of mine from Leopard to Snow leopard this weekend.  Same physical hardware and setup results in a dslreports.com speed test of the ethernet at about 50% of that of the leopard speeds (about 11.5Mbps over ether).  I have another slightly newer C2D mini on SL that is doing 10Mbps on the same network.  When I change startup disks to the SL disk, I end up with a max of about 4.5-5.5Mbps.  Any ideas?  I ran "Tune for High speed" on MLCC to open up the MTU size and such on both machines.  Same results.  I didn't try to update the existing partition (working Leopard) to SL, I scratch installed it on a new partiition.
Any ideas on what I should tweak to get the SL side to get to the same performance?  I can always upgrade (painfully) the Leopard side and test it and then revert if it has the same poor results)...
Thanks,
Jim

Sorry, I checked all the obvious.  The ifconfig shows both ETH0 running with the same parameters. 
Wifi is off on both partitions.
Sadly no obvious issue as to the 50% loss of throughput.
Any other ideas out there?  I also made sure IPv6 was off where possible.  Again another Mac Mini on SL is also on the same ETH network doing 13Mb+ to the dslreports.com/stest sites...(the good partition is the same, bad is doing about 5-6Mb/s).
jim

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