Katy (network expert) .. aquestion

Im trying to track down why my CRJ PFD suddenly lacks
smoothness. It's not so jerky that I can't fly, but the
machine is powerful enough and the graphics card good
enough (644 OpenGL rating when run in demo mode) that it
seems it oughta be a little more fluid.

My question is, would the network cards being different
brands have any effect on data transfer? I've replaced the
cards in two of my computers recently, and the one with the
PFD is an older card.

Would having all the cards of the same manufacture make any
difference??

Thanks
John White