On our DEC PCs with on-motherboard 21143's that 0.90 failed to properly negociate 100mbits with the 3com switch, and that 0.90f did the negociation right but got lower receive speeds, 0.90k seems to be working great, both for autonegociation and for full speed. Ttcp and netpipe show results at least as good as 0.90 forced to 100mbits and possibly better. - cks