As most of you know, with most video cards you can apply a simple series of tricks to boost the overall performance a little. You can do this at two levels, namely tweaking by enabling registry or BIOS hacks, or very simply to tamper with Image Quality. And then there is overclocking, which will give you the best possible results by far.
What do we need? One of the best tools for overclocking NVIDIA and ATI videocards is our own AfterBurner which will work with 90% of the graphics cards out there. We can really recommend it, download here.
Where should we go? Overclocking: By increasing the frequency of the videocard's memory and GPU, we can make the videocard increase its calculation clock cycles per second. It sounds hard, but it really can be done in less than a few minutes. I always tend to recommend to novice users and beginners, to not increase the frequency any higher than 5% on the core and memory clock. Example: If your card runs at 600 MHz (which is pretty common these days) then I suggest that you don't increase the frequency any higher than 30 to 50 MHz.
More advanced users push the frequency often way higher. Usually when your 3D graphics start to show artifacts such as white dots ("snow"), you should back down 10-15 MHz and leave it at that. Usually when you are overclocking too hard, it'll start to show artifacts, empty polygons or it will even freeze. Carefully find that limit and then back down at least 20 MHz from the moment you notice an artifact. Look carefully and observe well. I really wouldn't know why you need to overclock today's tested card anyway, but we'll still show it.
All in all... do it at your own risk.
Core Clock: 980 MHz
Core Core Clock: 1085 MHz
Core Clock: +75 MHz
Boost Clock: 1033 MHz
Boost Clock: 1150 MHz
Boost Clock: ~1241 MHz
Memory Clock: 6008 MHz
Memory Clock: 6010 MHz
Memory Clock: 6804 MHz
Now with the Dynamic boost function of the series 600 cards overclocking is definitely more complicated and limited to work with. It remains simple enough though if you know what and how to do it.
In your favorite overclock utility of choice you widen up the TDP limitations a bit, set the power limiter towards 114% (it is the maximum for this card). That way the Dynamic boost function won't down clock all the time to meet its upper threshold in TDP limitations.
We now add another 75 MHz towards the graphics core (that was the maximum stable on the of the factory-overclock),we'll add and increase Voltage with a +100 Mv. We now are hovering at 1241 MHz (which varies based on power draw/load/changes) on the overclock.
With a the physical board power limit you are going see all card roughly ending at this overclock and boost frequency. For the memory we ended ata fantastic 6804 MHz (effective data rate). At this stage the cooler RPM was set at default which kept the noise levels under control at 38 DBa and thus completely silent.
We now have a hint extra performance at our hands on top of the factory overclock, have a peek at the results when overclocked.
Above, Crysis 2, same maxed out image quality settings as before yet now with added overclock results:
High Resolution Texture Pack
Ultra Quality settings
Level - Times Square (2 minute custom time demo)
Above, 3DMark 11 - the Performance test and score. As you can see, there is an additional bump in this very GPU limited software, lovely. Also compare it with a reference GTX 680 results, that's roughly 2500 point away only. Mind you that GTX 660 Ti, 670 and GTX 680 overclock as well, so try to keep things in perspective.
Above, Alien versus Predator, in 1920x1200 at 4xAA and 16X anisotropic filtering
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