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970 STRIX BIOS overclock advice

post #1 of 6
Thread Starter 
After having a huge internal argument between the 390 and 970, I went with the 970 for features and overclocking. This card is a freaking beast, and I do not regret my decision. (perhaps I regret the strix, though, with only 1 8-pin connector and no VRAM sinks.)


My usual routine ever since the 6600GT has been to overclock using software like Precision, thoroughly test the clocks, and once I am satisfied, "bake" these clocks in using the BIOS. It is really nice not having to rely on software controlling my hardware in that way.

I was pleasantly surprised by the new maxwell setup, allowing me to hard-flash new fan behavior as well.


So anyway, I was able to achieve speeds of 1555MHz on the core and 8GHz on the memory. I was able to get 8.2, but over time it would get slightly glitchy, indicating heat. nopenopenope. Backed down to 8GHz and that does me just fine. When testing clocks, I also modified the 100% TDP to 225W (134% of original) to match the 75W PCIe slot and 8-Pin PCIe Connector. Never went above 126%, so that's plenty.

So right now I am in the process of tweaking the BIOS to match these clocks. Maxwell II BIOS Tweaker v1.36

The vRAM was obvious enough. Just change it on the Common tab. 4000MHz. Boom. Stable as a rock.

The problem has been the core. Instead of "clock states", there are 3 basic clock settings, but also 75 boost table entries, and voltage adjustments for each clock. Wow.

So after reading around, I heard it was recommended I set the boost clock and boost table based on my stable clocks. Done. I also raised the max voltages to make sure I can stick to 1.212 (hardware max?) for the higher clocks.

My problem is that either my voltage drops to 1.200, or my clocks drop. Currently, I am able to get it to stick to 1.212, but I can't get it any higher than 1455MHz. Not because of stability, it just simply decides not to go any higher than 1455, and after a few minutes of it, it downclocks to 1391. Heat is not an issue, I barely break 61C in furmark. (Lowest I have ever seen a card do.) Power is not an issue. Sometimes my "Limit reason" in GPU-Z comes up as simply blank. (???)


Anyone have experience BIOS-Modding Maxwell who can give me some heads up?

Thanks a million.thumb.gif
post #2 of 6
If it downclocks that much its normally because you run into Power limit. You can check that in Afterburner or GPU-Z easily, perfcap reason = power. There are also temp limits where the card throttles a clock and voltage step. Usually at 65 and 80 degrees or so.
Edited by Performer81 - 8/19/15 at 3:39am
post #3 of 6
Thread Starter 
Yeah, I mentioned that here:

"Heat is not an issue, I barely break 61C in furmark. (Lowest I have ever seen a card do.) Power is not an issue. Sometimes my "Limit reason" in GPU-Z comes up as simply blank."

I raised the max TDP to ensure that the limit reason is never power. And I always show my temps when testing. It technically isn't supposed to thermal throttle until 80-90C, and I actually lowered this to 75 because of the heat the card generates. But I currently struggle to get 60-61.

Though it might be worth raising the temp limit back up and checking again. If it does it as low as 65C, then lowering my limit to 75 might have dropped that lower limit to 60 or less.

GPU-Z doesn't seem to register it as that, though. Usually it comes up as V-rel, which is why I would like to know more about the voltage tables.

Thanks for the reply!
post #4 of 6
Thread Starter 
Anyone else?
post #5 of 6
Hi,

If you are willing to do some soldering you can try this: http://overclocking.guide/increase-the-nvidia-power-limit-all-cards/

This is the only "sure" way to remove power limit.

I have done this on my card and I've never seen the power usage go over 90% - the card does not throttle and I'm using the standard unmodified BIOS

It's running on 1520/8316
Edited by QuantumX - 8/25/15 at 2:11am
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Skylake
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post #6 of 6
Quote:
Originally Posted by QuantumX View Post

Hi,

If you are willing to do some soldering you can try this: http://overclocking.guide/increase-the-nvidia-power-limit-all-cards/

This is the only "sure" way to remove power limit.

I have done this on my card and I've never seen the power usage go over 90% - the card does not throttle and I'm using the standard unmodified BIOS

It's running on 1520/8316

Sorry for digging up an old thread. This is a question for QuantumX. I was reading through that hard mod to fix power limit on the 970 strix, had some reports of it not working in the comments, not sure if just noobs or if it actually doesn't work on the Strix 970. You seem to have it working.

Are you using afterburner etc to OC your 970? Samsung or Hynix? I guess Samsung. I'm about to buy a GTX970 with full cover EK block for a good price and hoping to get it to 1500/8000, not sure if it has Samsung or Hynix though. Did you do anything to increase voltage beyond +37mv or was the strix purely limited by the low power limit compared to other cards? They seem to be very good clocks for the strix, is that 1520 max boost achieved or what you set in afterburner etc?
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