PCI-e SATA Controllers

M2N78-LA (Violet 6) motherboard 64 bit
16 GB DDR3 memory
AMD Phenom II X4 logo quadcore 2.8 GHz
4TB Hybrid SSD/HDD
Windows 7 Home Premium
Corsair 300R case
Corsair 750M power supply

I think my onboard SATA controller is messed up so I want to try some PCI-e SATA controllers.:


How can I tell whether I have PCI-e 1.0 or 2.0?
Would the peripheral bus disk speeds be any faster or slower than the SATA bus?

(This is a tl;dr of this thread:
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