Since we’ve focused on exploring the effect of memory frequency on the performance of a GeForce GTX 780 Ti, the first pair of our summary charts is about that topic:
As we’ve noted during our tests, our memory overclocking had the biggest effect in Total War: Rome II. The overall trend is that the performance gain is higher with enabled antialiasing and lower without it: 2.0 to 2.1% on average without AA and 2.5 to 3.7% on average with AA. Anyway, it means that overclocking a GTX 780 Ti's memory doesn't lead to a substantial increase in speed in today's games.
The next pair of charts compares the ASUS GeForce GTX 780 Ti DirectCU II OC with the reference GeForce GTX 780 Ti:
The ASUS version is 4.5-5.1% ahead of the reference GTX 780 Ti at 1920x1080 and 4.1-5.3% ahead at 2560x1440. The original GTX 780 Ti cards we tested earlier have a higher GPU clock rate and thus can offer slightly higher performance.
Here is a comparison of the ASUS with one such original GTX 780 Ti (it is Gainward’s GeForce GTX 780 Ti Phantom):
The gap is negligible: 1.3-2.3% at 1920x1080 and 2.1-2.7% at 2560x1440 pixels. It’s impossible to feel this difference while actually playing games.
We measured the power consumption of computer systems with different graphics cards using a multifunctional panel Zalman ZM-MFC3 which can report how much power a computer (the monitor not included) draws from a wall socket. There were two test modes: 2D (editing documents in Microsoft Word and web surfing) and 3D (the intro scene of the Swamp level from Crysis 3 running four times in a loop at 2560x1440 with maximum visual quality settings but without MSAA). Here are the results:
Despite the smaller factory GPU overclocking, the configuration with ASUS GeForce GTX 780 Ti DirectCU II OC consumes 13 watts more power than the configuration with Gainward GeForce GTX 780 Ti Phantom. The ASUS also needs 17 watts more in 2D mode. With the graphics memory overclocked by 1000 MHz, the total power consumption of the ASUS configuration grew by 4 watts at peak load. A 600-watt PSU is going to be sufficient for any of these setups.