I have just bought a new Dimension 8400 which comes with Intel 537EP v9x DF PCI Modem.

I am getting really erratic performance when I dial up through my ISP.  One minute it gets a connection speed of 16.7, a few minutes later 44.4, and at other times all sorts of speeds in between.  My old computer was consistently getting speeds of 44.4 on the same telephone connection.

 

Any suggestions would be appreciated.