EVGA's GTX 680 Classified 4GB graphics card paired up with an EVGA X79 Classified motherboard, famous overclocker Vince "k|ngp|n" Lucido managed to get the GPU over magical 2GHz mark and even run the 3DMark 11 for some impressive scores.
The testbed consisted of EVGA's X79 Classified motherboard, Intel Core i7-3960X Sandy Bridge-E CPU working at 5538.75MHz, 16GB of G.Skill DDR3-2400 memory and EVGA's NEX 1500W PSU to keep the entire system fed with plenty of juice. The new record was scored by cooling the card with LN2 via Kingpin's own Tek-9 FAT 6.0 LN2 evaporator which was enough to take the card up to 2002MHz for the GPU and 7406MHz effective for memory, all at 1212mV core voltage.
In 3DMark 11, the overclocked setup scored 16472 marks in performance preset. Of course, this is an impressive score and overclock, but we are talking about hardcore overclocking, something that you do not see every day.
In any case, EVGA's GTX 680 Classified 4GB certainly has plenty of overclocking potential. You can check out the 3DMark result page here.Click for a bigger picture