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How to determine maximum memory clock on AMD GPUs with ECC memory?

post #1 of 4
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My card is a standard reference AMD 7970 by MSI that I have owned since the summer of 2012 and I have never really overclocked the card too far via increased voltage or anything. Stock clocks were 925/1375 but the card is currently sitting at 1100/1600. Being bored last Sunday I downloaded the Ghz bios and tried it out using the same clocks but I found the card then ran hotter and caused the fan to be very annoying as the voltage was increased much higher than my card's default 1.05v (high ASIC for my card). Anyway, after going back to the default bios I starting playing with my maximum overclocks on the core and memory. I discovered that I can get about 1160Mhz on the core but it requires me to max out my voltage at 1.175v and requires me to use a loud custom fan profile which I don't want. The memory clocks are a bit different as I seem to be able to run at 1950Mhz without adjusting the voltage past 1.6v but I struggle to believe that my memory is not within the realm of ECC at this point. I've noticed a few stutters here and there that go away for the most part when overclocking the memory voltage to 1.675v-1.7v but I'm still not convinced this is actually stable since I haven't really seen anyone reach those clocks on a reference cooled AMD 7970 on here and other forums.

I guess my question is how do you actually determine what your stable memory clocks are since these GPUs have ECC and the benchmarks or games don't start artifacting like they do when you have gone too far on the core clocks?
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post #2 of 4
OC only the memory, and set yourself a voltage of 1.659 (Max safe for 7xxx)

is 1950 stable?if so, keep it at that and/or go further, but teh second you have an artifact, take it down by 15MHz and retest

I had a card that had Elpinda RAM, and my RAM chip could do 1850Mhz, when every elpida maxed out at 1500 ish, so golden RAM chips to happen
     
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post #3 of 4
Fan will be loud if fan goes to full speed as you overclock. When you overclock memory, put core to default number. Not always increasing memory clock will give you better FPS in game.
It is stable if not cause any problem to picture or system during benchmark or game. You just have to find this edge edge on your card.
 
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post #4 of 4
The best way I've found for overclocking ecc memory is to start with gpu and memory at stock clocks and get a baseline benchmark, then adjust the memory upwards and run the same benchmark again to see if you got a performance increase. Keep repeating this in 50mhz increments until you either become unstable or reach a point where an increase in memory clocks no longer gains you any increase (or even in some cases a decrease) in performance, once the number is found go one step back and this will be your maximum memory overclock.
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