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As guest linked in a comment about. AnandTech's article attributes it to as the doubling of the clock speed used by the interconnect. PCI Express 2.0 builds upon PCI Express 1.x primarily through the doubling of the clock rate to 5.0GHz (up from 2.5GHz).


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It's done at the electrical level, not by software. The two registers you've listed above, LNK_CAP and LNK_STA are what you correctly noted as 'Here's what the link is capable of' and 'Here the current status'. There is also SLT_CAP and SLT_STA, which may be worth a look as that is specific to a given 'slot' in the machine. The PCIe spec defines a LTSSM -- ...


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Yes for 1 and 2. Keep in mind , booting off of 256GB 4*Drive PCIe x16 M.2 Solid State Drive Card is very fast but takes up four of your PCIe lanes. so you need to consider other cards that need PCIe lanes and the number of lanes your Mobo and processor support.



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