EVGA GeForce GTX 660 SC review
Posted by Hilbert Hagedoorn on: 09/17/2012 06:04 AM [ 5 comment(s) ]
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: 980 MHz||Core Core Clock: 1046 MHz||Core Clock: +45 MHz|
|Boost Clock: 1033 MHz||Boost Clock: 111 MHz||Boost Clock: ~1180 MHz|
|Memory Clock: 6008 MHz||Memory Clock: 6008 MHz||Memory Clock: 6696 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 your favorite overclock utility of choice you widen up the TDP limitations a bit, set the power limiter towards 110% (unfortunately 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 45 MHz towards the graphics core (that was the maximum stable on the of the factory-overclock), normally we'd add and increase Voltage with a +100 Mv but that feature was not yet working in the overclocking software. We now are hovering at 1180MHz (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 at +350 MHz which is almost 6696 MHz (effective data rate). At this stage the cooler RPM was set at default which kept the noise levels under control at 39~70 DBa and thus very normal.
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:
- DirectX 11
- High Resolution Texture Pack
- Ultra Quality settings
- 4x AA
- 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
In this article we review the EVGA GeForce GTX 650 Ti Boost SC edition review with that SC for superclocked. The product is fairly reference looking but does come with EVGA's own styled cooler, it has 2GB of memory with both that memory and the core baseclock slightly overclocked quite significant.
EVGA GeForce GTX 660 SC review
We review the EVGA GeForce GTX 660 SC aka SuperClocked edition. as the name implies it is already factory overclocked for you with a 1046 MHz baseclock that can boost towards 1111 MHz.
EVGA GeForce GTX 660 Ti SC review
We have another GeForce GTX 660 Ti review for you today as we'll put the GeForce GTX 660 Ti from EVGA to the test, it's their factory clocked version, the GeForce GTX 660 Ti SuperClocked (SC) version.So it isn't hard to understand that the factory overclocked GeForce 660 Ti SKUs will run fairly close to the GeForce GTX 670 (reference clocked) and maybe Let's have a peek.
EVGA GeForce GTX 680 Classified with EVBOT review
We'll test the EVGA GeForce GTX 680 Classified today. A product that is 100% customized from PCB to cooling. Software voltage regulation works, but obviously as well is limited to that 1.175V. EVGA however does have an alternative for the Classified model as tested today, you can hook up a small piece of hardware to it called EVBot, which controls the voltages directly at hardware level, and thus bypassing the NVAPI software limitation. 1400 MHz, here we come.