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Old 06-03-12, 04:11 AM   #5
alitayyab
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Join Date: Oct 2005
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Default Re: GTX 670 detected as PCI-E 2.0 only?

Assuming your sig is correct and you have a sandybridge processor you will not be able to get PCI-e 3.0 BW as the pci-e 3.0 lanes originate from the CPU . if you dont have an IB CPU you really do not have PCI-e 3.0 lanes, even if your board is gen 3 certified. You would need to pair it to a IB processor to get PCI-e 3.0 bandwidth

This is also listed on the ur board's web page:

http://www.asus.com/Motherboards/Int...55/P8Z68VGEN3/

read below "PCI Express® 3.0"
Quote:
* Actual PCIe 3.0 speed varies with the installed CPU type.

The z77 PCH diagram (link below) elucidates this point. Look at where the PCI-e 3.0 lanes originate from:

http://techreport.com/articles.x/22755


Older (<PCH 7), that have certification for gen3 only have lanes that are 'sturdy' enough (electrically) to carry over the PCI-e 3.0 bandwidth.
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