Palit GeForce GTX 670 JetStream review

Posted by Hilbert Hagedoorn on: 05/09/2012 01:00 PM [ 0 comment(s) ]

Overclocking the graphics card

Overclocking the graphics card

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.

Original	This sample	Overclocked
Core Clock: 915 MHz	Core Core Clock: 1006 MHz	Core Clock: +50 MHz
Boost Clock: 980 MHz	Boost Clock: 1084 MHz	Boost Clock: 1228 MHz
Memory Clock: 6008 MHz	Memory Clock: 6108 MHz	Memory Clock: 7008 MHz

Now with the Dynamic boost function of the series 600 cards overclocking is definitely more complicated to work with. It remains simple enough though if you know what and how to do it.

In afterburner we go into the preferences. We can widen up the TDP limitations a bit, set the power limiter towards 122%. That way the Dynamic boost function won't down clock all the time to meet it's upper threshold in TDP limitations.

We now add another 50MHz towards the graphics core (that was the maximum stable on the of the factory-overclock). The dynamic clock will still kick as well with the power limiter now loosened up, as such we noticed roughly 1228 Mhz.

So you'll notice that we pass 1200 MHz on the graphics core absolutely stable and for the memory we ended at 7008 MHz (effective data rate). At this stage the cooler RPM was set at 60% as such the noise level has now risen towards roughly ~44 DBa which is noisy.

We now have some extra performance at our hands, have a peek at the results when overclocked.

Palit GeForce GTX 670

Above, Crysis 2, same maxed out image quality settings as before yet now with added overclock results:

DirectX 11
High Resolution Texture Pack
Ultra Quality settings
4x AA
Level - Times Square (2 minute custom time demo)

Palit GeForce GTX 670

Above, 3DMark 11 - the Performance test and score. As you can see, there is an additional bump in this very GPU limited software, lovely.

Palit GeForce GTX 670

Above, Alien versus Predator, in 1920x1200 at 4xAA and 16X anisotropic filtering

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