MSI GeForce GTX 660 Ti Power Editon OC review

Posted by Hilbert Hagedoorn on: 08/15/2012 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.

Reference product	This sample	Overclocked
Core Clock: 915 MHz	Core Core Clock: 1020 MHz	Core Clock: +125 MHz
Boost Clock: 980 MHz	Boost Clock: 1098 MHz	Boost Clock: ~1313 MHz
Memory Clock: 6008 MHz	Memory Clock: 6008 MHz	Memory Clock: 6958 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.

MSI GTX 660 Ti Power OC Edition

In MSI AfterBurner you widen up the TDP limitations a bit, set the power limiter towards 114%. 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 125 MHz towards the graphics core (that was the maximum stable on the of the factory-overclock) and increase Voltage with a +100 Mv. We now are hovering at just above 1300 MHz (which varies based on power draw/load/changes) on the overclock.

For the memory we ended at +475 MHz which is almost 7000 MHz (effective data rate). At this stage the cooler RPM was set at default which kept the noise levels under control at 40~41 DBa.

We now have some extra performance at our hands on top of the factory overclock, have a peek at the results when overclocked.

MSI GTX 660 Ti Power OC Edition

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)

MSI GTX 660 Ti Power OC Edition

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. Mind you that GTX 670 and GTX 680 overclock as well, so try to keep things in perspective.

MSI GTX 660 Ti Power OC Edition

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

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