A few years back, I picked up a lot of 10 graphics cards on eBay for around $100. Most of them turned out to be junk—though they might make for interesting test subjects someday. But one card immediately stood out: a silver heatsink with the unmistakable shape of a 3dfx Voodoo 3! Of course, the lot was sold as untested – which, in eBay terms, means NOT WORKING! I really should have seen…