
Well done, you didn't pay attention to the video you're linking, it's a daughterboard, not a sisterboard.It's just motherboard and sisterboard...
If you want to see a video of the inside of the mac pro
http://odtv.me/2009/03/mac-pro-unboxing/
It's used for spacing, also this way it divides up the system, the hard drive trays at the top, the PCI cards on the motherboard in the middle and the CPU and RAM at the bottom.
Notice how I didn't mention daughter when I posted?
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http://dong.engineer/
it is just videos by bill wurtz videos you have been warned
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