I've tried EtherExpress (under kernel 2.2.x) and 3c905B, and with the current krenel drivers bot were working bad under high machine load.Then I switched to the driver from 3com and I haven't got a problem ever since. The biggest problem are the drivers - If you find good one, almost any card will work good...There were some good discussions on linux-kernel, you can find 'coverage' at kernel traffic ( kt.linuxcare.com)