Newbie mining question. How are all these motherboards linked?

[MagicBit15]

So in the video it looks like he is running 3x AMD Cards on Crossfire, each motherboard has it's seperate HDD and CPU I can see. But how are they all linked to run 5gh/s?

Is just one unit mining linked up to it? Or are they seperately mining and it combines to 5gh/s.

I assume they are connected, if so how does it work, what cables does he use, and how is it just running on one rig. I know this is newbie question, but I want real answer which I am probably going to get hereJust seems insane they are all running simultaneously. Same question for people with closed cabinets that have them all linked. Just curious.

(Please don't move, doesn't deserve it : [[)

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[Nesetalis]

It is fairly simple.
A hash is a singular atomic unit... the number of hashes you do per second is your current rate. How ever many machines you have doing the hashing counts towards your total number of hashes per second... thus have enough machines you are producing 5Ghash/s

And they would all be calling back to a central bitcoin client, whether its a public pool, or a private pool.

[MagicBit15]

It is fairly simple.
A hash is a singular atomic unit... the number of hashes you do per second is your current rate. How ever many machines you have doing the hashing counts towards your total number of hashes per second... thus have enough machines you are producing 5Ghash/s

And they would all be calling back to a central bitcoin client, whether its a public pool, or a private pool.

Awesome thank you!! and this was the video btw

https://www.youtube.com/watch?v=2nDTBN_cPs0