dell optiplex 990 pcie slots - Dell Optiplex 755 slot big win 888

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I've read quite a bit about the so-called 35W limit for the Optiplex SFF's PCIe x16 slot.  But unless Dell used inferior quality motherboards with substandard ...

In a Dell Optiplex 7010 Mini-Tower with an i3 CPU and a Q77 chipset, the PCIe slots are only Gen 2 (PCIe version 2). If I change the CPU to an i5 or i7, will I get PCIe Gen 3 (PCIe version 3) in any of the PCIe slots?