PAX East 2011, which kicks off tomorrow, is widely expected to finally deliver a dual-GPU solution from NVIDIA's Fermi family of graphics chips, a PCI Express-saturating single-card workhorse to be known as the GTX 590. While we wait for its arrival, however, here's a sentimental look back upon 2010 and another little prototype that NVIDIA had kicking around its labs back then. Emerging over in a Chinese forum, this dual-GPU board features two GF104 chips (the same that made the GTX 460 such a winner) and a snow white PCB pai