These reference cards with the reference cooling were able to clock up to 952/1904MHz on the CUDA cores and 1092MHz (4368MHz effective) with not much more than a bump of the voltage and fan speeds to get there. That's a 20+% improvement folks. This offered up a significant increase in firepower and showed in the results. Add in that second card and the performance skyrockets. When two GTS 450 cards are run in an SLI configuration, the performance almost doubles in most of the games I tested. In some instances the performance literally did double from the single to a multiple card configuration.



Link: Overclockersclub