I had a couple of old ISA Intel network cards that had 286 processors onboard, if that's the kind of thing you're talking about. It's highly unlikely that your NIC does, unless you paid a few hundred dollars for it. The most common Realtek NICs/onboard chips are very basic and are only intended to get the job done, they aren't very efficient.
test?, no. I look at the back of the Tower. if the Lan connection is right next to the mouse and serial ports and not down where the modem and video cards go, chances are it is intagrated. If you look in the case, anything that comes directly Off the mobo to the case,,is intagrated..the pci,Apg slots are for internal cards.
Hope this help ya.
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