Yes, Lux supports GPU rendering.

Haven't tried it myself. I don't imagine my 550 Ti is going to be an improvement over my machine's native computing power. Perhaps I'm wrong on that, but I do tax my graphics card with a lot of open windows & applications etc as it is, to the degree that my display occasionally stalls for a couple seconds. Someday when I have a superfluity of cash (ha!) I'll upgrade that end of my system, which is the only thing that's really weak.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3