Motherboard designing engineering

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darnthedog

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Apr 7, 2011
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Hello,
With all the backward compatiblity of USB 3.0 and SATA3/ 6 GIG. Why have any older slots available. Why not just take for example the ASUS SABERTOOTH P67 (REV 3.0)and make all the SATA ports 6.0 GIG. And all the USB ports 3.0. Maybe I misunderstand backward compatibily. But as I understand it if you plug a SATA 1 drive into a Sata 3 slot it will only run at Sata 1 speed. And If you plug a Sata 3 drive into a Sata 1 slot it only runs at Sata 1 speed. So why make Sata 1,2,3 connectors at all. Why not make them all Sata 3 and elinate the confusion? Same with USB. Why not make them all USB 3.0 instead of limiting to 2 slots.
 
Solution
Because you have '20' Lanes to 'split' all of that data, so placing a x1 Sound Card, for example, to suck-up +7 PCIe lanes can be done but it takes away from other more useful things like CF/SLI. Now, if there were '50+' lanes then it's not so much a problem. PCI and PCIe cards are not compatible and require their own slot(s), there are still PCI cards sold.

The SATAI/II/III are 150/300/~600 MB/s, but share bandwidth which still needs to be allocated. SATA Cables and connections are the same and backward or forward compatable.

Next, USB3 ignoring a caveat or two 'USB B' you've got the same bandwidth problem.

You can have a completely dysfunctional MOBO unless you manage your lanes/bandwidth effectively.

It's all about bandwidth.
Because you have '20' Lanes to 'split' all of that data, so placing a x1 Sound Card, for example, to suck-up +7 PCIe lanes can be done but it takes away from other more useful things like CF/SLI. Now, if there were '50+' lanes then it's not so much a problem. PCI and PCIe cards are not compatible and require their own slot(s), there are still PCI cards sold.

The SATAI/II/III are 150/300/~600 MB/s, but share bandwidth which still needs to be allocated. SATA Cables and connections are the same and backward or forward compatable.

Next, USB3 ignoring a caveat or two 'USB B' you've got the same bandwidth problem.

You can have a completely dysfunctional MOBO unless you manage your lanes/bandwidth effectively.

It's all about bandwidth.
 
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