P. S.
I've already grabbed some GT 710, GT 640, GT 740 cards, which work fine once Mojave boots up.
But even those cards are around $50 or more per card, so when I saw the K600 for $20 bucks?!?!
And, I agree, I am a HUGE fan of recycle / repurpose / re-use rather than to toss good, useful...