This is interesting
http://www.hardocp.com/article/2014...overclocking_video_card_review/4#.VNvcrPmsVKU
EDIT : If I lower the voltage I get a VREL = Need more volts
http://www.hardocp.com/article/2014...overclocking_video_card_review/4#.VNvcrPmsVKU
Our final overclock turned out to be +250 Core Clock offset and +500 memory offset. This results in a Base Clock of 1377MHz and a Boost Clock of 1466MHz. However, the real-time in-game frequency is actually 1516MHz!
However, there is a disclaimer with this overclock. There were some games that throttled between 1497MHz - 1516MHz while gaming. Worse case scenario, we saw the clock speed run at 1497MHz, but then it could and would dynamically change as we played. In certain parts of the game it would be 1497MHz, in other parts it would be 1516MHz depending on the load.
Throughout the entirety of two games it remained consistent at 1516MHz without changing at all. However in a couple of other games it did dynamically change between 1497MHz and 1516MHz. Therefore, our overclocking range is actually 1497MHz to 1516MHz, depending on the game and the game situation. We never saw it drop below 1497MHz, unless we raised the voltage.
The default voltage to achieve this was 1.218v. If we raised the voltage to 1.243v the maximum overclock we could achieve was only 1452MHz. We could not get the GPU over 1452MHz with the GPU voltage maxed out. Anything above that would throttle the GPU back to 1452MHz. Therefore actually keeping the voltage lower, at its default 1.218v allowed a 64MHz higher overclock.
We achieved an 8GHz clock on the memory. This is a full 1GHz overclock from the default of 7GHz.
Our final overclock was: 1516MHz/8GHz. This is a 276MHz overclock. Yet, we do feel there is more headroom in this GPU just like the GTX 970. We are only held back by the TDP/Power Limit wall. Imagine no power limits, and being able to raise the voltage, 1.6GHz may not be out of the realm of possibility. Remember, this is just a reference video card, with reference cooler, and we got 1516MHz out of it without changing the voltage. Simply outrageous, in a good way.
EDIT : If I lower the voltage I get a VREL = Need more volts
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