I ran several stacks of 4 using the matrix cables to connect each unit then port trunk 3 lines @ full duplex back to my server backbone - worked fine and rarely hit high utilization or errors as long as we spread the wealth but when I was moving into a new facility with new software with new resource needs, Gigabit was the only way to go, at least for the backbone....
If you're building from scratch and have decent resources, go gigabit, if things are tight, 100 megabit is fine to the desktop, stacked these units have a 1.8 gig backplane which is fine for internal traffic....
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