Gigabit Speed problems

I have an office with a 15 computer "workgroup" network with a dual xeon server.  I have created a 900 Megabyte file to test the transfer speed between each computer and the server.  All are connected with gigabit adapters (most with intel Pro).  

Why are some of the computers so slow at transfering this file.  In one case, I have three identical computers (quad core with 2 Gig of ram and XP Pro).  One of them takes 9 seconds to transfer the file while the other two takes 1 Minute and 40 seconds.

My personal computer is a HP Pavilion I7-930 with 8 Gig of ram.  It also takes 1 min and 40 seconds.  I have tried comparing drivers and card settings

Any help would be appreciated in explaining the speed differences.
Who is Participating?
Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
Check the cables too.  And 'autonegotiation'.
torvirConnect With a Mentor Commented:
It seems that the computers that does the transfer in 9 seconds has a gigabit connection in the network while the ones that takes >90 seconds has a 100Mbit connection between itself and the server.
Could it be that some of the switchports are 100Mbit? (Most likely scenario)
Or do you have two gibabit switches with 100Mbit between the switches? (This theory is less likely)
teriderAuthor Commented:
Both answers put me onto the solution to this problem which has bugged me for a long time.  For some unjustified reason the autonegotiation of the Intel card was going to 100M.

I rulled out the cables by using the same patch cable and wall socket on all computers.

I happen to notice the "Link Speed" tab in the properties and changed it form "Autonegotiate" to "1.0 Gbps Full Duplex."  Bingo,they all took off at maximum speed.  Also, the 10M connected printer seems to work fine in this setting.

Dave BaldwinFixer of ProblemsCommented:
Thanks, glad you got it fixed.
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