Despite its rather high temperature and 4 gigabytes of memory, the EVGA GeForce GTX 670 Superclocked did very well in our overclockability test, being stable in most applications after we had added 150 MHz to its base GPU clock rate and 1540 MHz to its memory clock rate.
Thus, the resulting frequencies of our EVGA GeForce GTX 670 Superclocked were 1117 MHz (boosted by 79 MHz) and 7548 MHz for the GPU and memory, respectively.
Interestingly, the overclocked graphics card retained the same temperature in the automatic fan regulation mode: 86°C at 2640 RPM.
After some more testing we had to reduce the GPU and memory clock rates to 1107 and 7448 MHz, respectively, to avoid any stability issues.
Anyway, this is fantastic overclocking considering that we didn’t change the GPU’s voltage. Well, we must confess that increasing that voltage didn’t help us get better results, probably due to the insufficient efficiency of the cooling system.
We measured the power consumption of our testbed equipped with different graphics cards using a multifunctional Zalman ZM-MFC3 panel, which can report how much power a computer (without the monitor) draws from a wall outlet. There were two test modes: 2D (editing documents in Microsoft Word or web surfing) and 3D (three runs of a Metro 2033: The Last Refuge benchmark in 2560x1440 resolution with maximum image quality settings).
Here are the results:
As expected, the double amount of memory on board the EVGA card doesn’t affect its power consumption compared to the reference GeForce GTX 670. A 550-watt power supply would be quite enough for our system with an overclocked six-core CPU.