He's overclocking the retail card, and probably has fans and heatsinks that are large enough to block off the next 2 PCI slots.
As for the extra money, it's only like 15-30 extra for the retail, and I recomend going that route, simply for the extra room in overclocking as well as the defalt gain in performance over the OEM/LE
Bad trolls Bad trolls... Whacha gonna do... Whacha gonna do when they post here too...