For many would-be early adopters, trying to find a GTX 680 has been like trying to find a four-leaf clover; it can be done, but it takes some digging. (Hey, there's some EVGAs on Newegg right now!) Curious minds have wondered what the hold-up is. Manufacturing woes? Overbearing demand? We now have an idea. In a slide shown at an annual investors meeting, Nvidia claims that in the six weeks following the GTX 680's launch, it shipped and sold 60 percent more units than the GTX 580 did during its debut.