> Of course there are many variables. Crappy network cards often times > result in crappy throughput. Crappy network drivers often times result > in crappy throughput. Plus you didn't really include any details. How > are you determining your network speed? Have you checked for errors on > your interfaces? What operating systems involved? Have you done any OS > tweaking? You imply multiple swtiches, how many are involved? Linux-to-Linux, both on the same 100M switch, no errors on the cards, they're both showing 100FDX, one's a VIA Rhine, the other's an NForce-based cared using the Forcedeth driver. Both fairly fast machines with a nice amount of RAM. But basically... does that mean my calculations are, in fact, correct? Cause to me, THAT'S what would be a big surprise (: -Yaron --