You do not normally have that much bandwidth even in a modern machine.
Typical bandwidth for the northbridge/southbridge connection is 1-2 GB/s
for most machines sold today. (For example just about all machines with
a recent Intel desktop chipset. The connection between north- and south-bridge
on those is equivalent to a PCI-E x4 connection (which provides 1GB/s in each

as long as it's not saturated it's not a problem.

with several other devices (which is not uncommon) then the reduced
bandwidth usage can be very useful.

true. but not if it's builtin in chipset or on PCI express.

PCI-E controller cards are still fairly uncommon, and many of them

but integrated in chipset - common.

require a x4 or x8 slot, while most motherboards only have x1 slots
(apart from the x16 slot intended for a graphics card.)

this slot is usable for anything.
i always take some old PCI card for free for servers. as they don't need graphics anyway.

on my 8-disk server i could get 95MB/s from EACH of 8 drives in parallel, still having minimal system load.

it isn't anything expensive, quite cheap gigabyte motherboard with core2 duo and 2GB RAM
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