Ok guys, here's what's going on: I have a Mac Pro (10.5.6 all updates), and a Win2k3 server. I have full gigabit in the house. All hand made CAT6 cables made by me, and a gigabit switch. The problem is that I can FTP transfer FROM my Mac Pro to the server at 120MB/s (yes, its capping the gig link), but going TO my Mac Pro from the server, I can only hit 42MB/s. It's almost like it's capped there somehow. I've looked up network tuning for both OSX and Win2k3, and made the appropriate modifications on both sides with no changes in speed. Oh, the other odd thing is that I get ~42MB/s wether I am downloading to my single boot drive or my raid array on the Mac. I know 40MB/s is still "fast", but it drives me insane that I can't get 120MB/s both ways when I know my hardware is plenty capable Specs: Mac Pro 8x2.8Ghz 6GB ram 750gb Samsung Spinpoint F1 32mb cache (boot) 3x 500gb Seagate 7200.10 (raid0) for storage (yes, its backed up) Win2k3 server 4x2.4Ghz 4GB ram 8x Seagate 7200.10 (raid5) on an LSI megaraid SAS controller I've tested both drives on either side, and they are more than capable of speeds better than gigabit can support. Any ideas?