Watched the Core's back LEDs in a darkened room and that part does respond to OpenRGB.

Just as you said, the LED strip below graphics card doesn't respond due to the antiquity of my GPU.

I use the Nvidia GeForce 1080ti Founders Edition.

The Serial: is BY1651U00100058

Works for everything except my old Razer Core V1 with GeForce GTX 1080ti Founder's edition.

It does detect the Core now, but it doesn't respond to OpenRGB.

Before my Razer Abyssus Essential didn't work but now it does!