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: 1006 MHz
Core Core Clock: 1058 MHz
Core Clock: 1173 MHz
Boost Clock: 1058 MHz
Boost Clock: 1176 MHz
Boost Clock: ~1291 MHz
Memory Clock: 6000 MHz
Memory Clock: 6008 MHz
Memory Clock: 6908 MHz
Now with the Dynamic boost function of the series 600 cards overclocking is definitely going to be more complicated. It remains simple though. Mind you that for overclocking we used Beta 15 of AfterBurner for ease of use.
In afterburner we go into the preferences. We can widen up the TDP limitations a bit, set the power limiter towards it's maximum. That way the Dynamic boost function won't down clock all the time to meet it's upper threshold in TDP limitations.
We have core voltage upped another 100Mv, but the NVIDIA driver currently does not seem to kick in the additional voltage. So this feature is not yet possible in the current NV GeForce drivers.
The Core clock was increased with another 115 MHz and the memory got an amazing 440 MHz added as well.
So for the core we ended at 1291 (incl Turbo) MHz absolutely stable and for the memory we ended close to 7 GHz (!) (effective data rate). At this stage we locked the cooler RPM at 55% RPM, that's slightly noisy for this cooler though. We now have some extra performance at our hands, 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 intensive software, lovely.
Above, Alien versus Predator, in 1920x1200 at 4xAA and 16X anisotropic filtering
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