Ok, my mobo I've had for over almost a year has like 2-3 of these slots. But what the heck uses them? I haven't found any hardware yet that does.
Phaelax 52 Practically a Posting Shark
Catweazle 140 Grandad Team Colleague
Primarily used for specialised network cards for use in servers, from what I've seen or heard. They're also used for some SCSI RAID cards.
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