I understand you need compatibility information for PCI Express revisions.
The processor model i3-3220 handles PCI Express revision 2.0. At this stage if you install a Pie video card 3.0 the card will work as 2.0 version. I regret to inform you that Intel does not have performance information for this compatibility; this will be provided by the card vendor or manufacturer.
i thinks its not the processor the its not compatible as long as your motherboard support your videocard it will work..