As far as i know there are 3 possibility's for onboard lan chip: intel , broadcom and realtek.
what is best and what is no good, or does it not matter?
thanks for any reply
You'll find Intel and Broadcom mainly on servers (though Intel can sometimes be found on a few high-end desktop motherboards). The motherboard type often dictates the LAN controller: Mostly Intel (and sometimes Broadcom) for servers and workstations; Realtek or Marvell for less expensive motherboards.