Trivia Question that no one yet had solved

Windows XP is on a network with Apple G5
Copying for example 50mg file from IBM to Apple takes about 5 min??? Copying from Apple G5 to IBM takes 5 sec!
Going to Apple G5 and pulling out of C drive on IBM into the Apple desktop the transfer time is also 5 sec.
The whole problem is with using IBM to transfer the files to Apple G5.
The strange thing that there is no problem with Apple G4 that is on this network!
Where is the problem? Apple tech support, Windows Tech support plus 2 local technicians could not find the problem.
Did anyone had the same thing, was it solved?
Thanks.
G5   Mac OS X (10.4.4)  

As I posted in the thread mentioned above:
I have the same problem with a 2.3GHZ dual G5, new from this fall, 2.5GB ram, Gbit network with very good switch here.
On old G4 mirror doors (dual boot) 1.25GHz, 1.25GB RAM, I can transfer about 2.5GB of data from the (Panther) server to the G4 in less than 2 minutes, and that's in OS 9 !!!! I get about 1 1/2 minutes for the same files to be transfered on other G4's configured EXACTLY the same, but running various OS's: 10.2.6, 10.2.8, 10.3.3, 10.3.7, 10.3.9....
On my G5, I can't even come remotely close to that, It takes about double the time, say, just below 3 minutes. I have had the same speeds in the original Tiger that came with the machine, in 10.4.3 and in 10.4.4. I also tried switching between Ethernet port 1 and 2, no difference. I tried all kind of configurations, even displaced the comp to the location of another comp to use it's connection to the server, still no improvement. What I find amazing, is that writing TO the server is even slower tna redaing from it!!! NOTE: all the tests I tried were using the SAME 2.5 GB or so of data for each comp, being made up of a healthy mix of small and large files, ranging from about 4MB to 450MB each (no bizillions of tiny files there!), ensuring that the data copying was the only task being done on both the server and the workstation.
I have come to suspect that the problem is within TIGER, since I am the only on running TIGER here or maybe a mix of the newer G5 and Tiger, as I have not seen this on older G5's running Panther 10.3.9 here. I can't compare moving the exact same data with the other G5's because they are on a separate network (built with exactly the same components) but they seemed to be transfering data at a proper rate.
I will need to install TIGER on an older Mac for at least testing purposes, just to see if there is a noticeable slowdown on the network.
Are the G4's mentioned running Tiger as well? just a thought...
Sorry I can't test with PeeCee's here, I don't have access to any.

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