so if i were to add that PCIEx4 card in the PCIEx4 slot on my motherboard would that bring the bandwidth of my GPU slot from x16 to x8??
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I wouldn't go tossing the USB Card into one of your Red PCIe slots, but no it won't effect your GPU lane.
The 'effect' is when you're running data through the USB and GPU; the effect is 'bottlenecking' the CPU and not the PCIe. So if you're planning on playing a Game while copying a HDD from USB 3 - yeah, it will drop the performance because of the CPU not the PCIe.
Intel PCI Express Configurations 1x16, 2x8 -corresponds-> ASUS 2 x PCIe 2.0 x16 (red) support single at x16 or dual at x8 mode