To push the GTX 780 Ti to its limits, we fired up EVGA Precision X, our favourite tool for the job when it comes to Nvidia cards. As ever, we began by raising the power and thermal thresholds to the maximum allowed, which are 106 percent and 95°C respectively.
We eventually managed to add 224MHz to the base clock, taking it to an absolutely massive 1,100MHz. The boost clock at this level was 1,152Mhz, but we regularly witnessed it hitting a whopping 1,230Mhz. This base clock gain is a whole 26 percent, one of the largest we've seen for a very long time. How much of this is down to Nvidia's Power Balancing feature and how much is down to sheer sample luck (or selection, if you're the cynical type), we simply can't be sure right now. We also added a respectable 11 percent to the memory clock, taking it to 1.95GHz (7.8GHz effective) for a new total memory bandwidth of 374.4GB/sec.
During our testing, we couldn't quite believe how far we were able to push this new iteration of the GK110 GPU, but the card remained stable at these clocks for extended stress tests. We pumped an extra 75mV through it, the maximum allowed in Precision X, but saw no real increase in temperature. Fan noise did become much more noticeable, but it was still within the realms of tolerable, much more so than the R9 290X in Uber Mode.
As you can see, the results are pretty phenomenal. As well as extending its lead on GTX Titan and the R9 290X, the GTX 780 Ti even begins to surpass the dual GPU GTX 690 and HD 7990 cards.
Overclocking - Battlefield 3
2,560 x 1,600, 4x AA 16x AF, ultra detail settings, DirectX 11