Will I be able to overclock the EVGA SuperClocked 02G-P4-2662-KR GeForce GTX 660 2GB more than it is already overclocked. I have a 650 watt power supply will I be able to handle 2 of those in SLI for later when I want a speed boost.
The Evga gtx660 is factory overclocked. These cards are however voltage locked, as is most of Nvidia's gtx600 series so you will have limited headroom, but it should still have some room left for additional overclocking. Note that each card is different, and how high of an overclock you can get varies from chip to chip.