Question : Large File Copy Depletes Physical Memory

I'm baffled.  Windows Server 2003 Standard Edition SP2, all updates applied.  I
can copy large files from this server to other machines on the network just
fine, great speed.  

When I go to copy a large file (> 2GB) to this machine it starts out great,
but after about a minute or two the speed of the transfer slows greatly and
the entire box becomes very sluggish.  

I started monitoring this to see what was happening.  I look at the task
manager resources and I notice that as soon as I start the copy (either
locally or remote) the physical memory (k) available memory starts decreasing
in 30-50k chunks until it brings it all the way down to about 2-3MB
available.  The machine starts to tank at this point.  As soon as I kill the
copy, the available memory jumps right back up and the box resumes normalcy.

I've experimented with other windows server 2003 machines I have, this
doesn't happen there.  

For some reason, the large file copy is slowly eating all of my available memory and rendering my machine useless.

Answer : Large File Copy Depletes Physical Memory

Sorry, I narrowed it down to something funky with my assisted software RAID controller, it was an intel ICH7R. i ended up just blowing the array away and trying to go raid 1, then windows wouldn't recognize the array during setup even with the drivers loaded during boot, so i gave up on it and determined i'm not messing with software RAID anymore!  I removed RAID from this machine for the time being till I can get a hardware RAID solution.  Thank you for the assistance though!!