Overclocking any Kepler-based graphics card has never been an easy affair since NVIDIA puts hard caps on their power and voltage limits. The GTX 780 Ti is really no different in its approach but its maximum +75mV of over-voltage is actually quite a bit higher than the reference GTX 780 allowed. That’s a great bit of news since voltage was always a bottleneck when trying to hit higher frequencies and when this extra allowance is combined with NVIDIA’s new Power Balancing feature, we were able to achieve some very good results.
While voltage thresholds have seen an increase, the GTX 780 Ti's maximum Power Limit is on the disappointing side. At just 106% it actually stepped in to limit clock speeds more often than the Voltage Limit did. We hope that NVIDIA's board partners are able to address this since, with adequate cooling, this card could truly fly.
Even with NVIDIA's limits constraining frequencies, our sample hit a constant core speed 1143MHz with peaks around the 1176MHz mark and quite a bit higher than reference Boost clocks. Meanwhile, memory frequencies topped out at 7744MHz which is about average for 7Gbps modules.
The core in particular was a surprise but it needs to be mentioned that even with its extra overhead, NVIDIA’s Power Limit did step in the way and without it we have no doubt this card could have easily achieved even higher speeds. As it stands, with overclocks in place, the GTX 780 Ti is nearly a match for the GTX 690…and that is impressive to say the least!