CW-NAS-AMD-FP7-20G

I just got this motherboard set up. I'm trying to use it with an Intel Arc A380 GPU. At first the motherboard would not recognize the GPU. But after playing around with the BIOS setting, I found a setting for the PCIE to change from 8X speed to 4X4X. Now the GPU is recognized and working, but it seems to be running very slow. I'm not sure what 4X4X speed is compared to the 8X speed.