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[Official] AMD R9 390/390X Owners Club - Page 604

post #6031 of 11736
Quote:
Originally Posted by mus1mus View Post

I'm just chiming in to give some insights. thumb.gif

Memory straps info - these cards have memory straps that you need to target when overclocking.

1375 -
1500 -
1625 -
1750 -
1875 -

With the exception of the XFX DD 290X 8GB where the BIOS litterally don't follow such rule, when you OC the Memory, follow this rule:

Shoot for the strap ends. See above. If you are nearing the higher strap end, say 1620 -- it uses the the timings from 1501-1625 -- meaning, tight timings for the frequency.

Whereas if you are at 1650 - 25MHz from 1625, you are now using 1626-1750 timings. Closer to 1625 than to 1750. Meaning, loose timings for the freqiency.

I am willing to bet 1200/1625 scores better than 1200/1650 that you are in. You can test to confirm. Also, it's not gonna hurt to try 1750 for 3XX Cards seem to do better in memory OC than the 2XX cards. thumb.gif

Trying to figure this out. my MSI 390x at 1700 and 30/35mV is unstable. I tried 1750 and 50mV aux and i get lines flashing sometimes. So that's not stable. It is stable at 1650 and 25mV. I have not added any core voltage. Do I need less more more Aux voltage? haha
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post #6032 of 11736
I have not yet increased my gpu aux voltage as i' mnot sure how this will affect performance and temps and so on.
pj
Edited by peejay2104 - 2/7/16 at 10:42am
post #6033 of 11736
I also have not increased memory voltage yet. Is that the reason it black screens?
post #6034 of 11736
Quote:
Originally Posted by peejay2104 View Post

I also have not increased memory voltage yet. Is that the reason it black screens?

I know if you increase mem speed the aux voltage needs increased. My 390x seems to be stable at 1650 speed 25 mV Aux. Im trying to get past that speed though.
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post #6035 of 11736
Quote:
Originally Posted by THUMPer1 View Post

Trying to figure this out. my MSI 390x at 1700 and 30/35mV is unstable. I tried 1750 and 50mV aux and i get lines flashing sometimes. So that's not stable. It is stable at 1650 and 25mV. I have not added any core voltage. Do I need less more more Aux voltage? haha

if it was unstable at 1700, why did you bump it up to 1750?

for memory you might be better off with 1625 than 1650, because of how the memory timings in the bios are setup. Even though 1650 is higher it uses higher/looser (worse) timings
post #6036 of 11736
Quote:
Originally Posted by THUMPer1 View Post

I know if you increase mem speed the aux voltage needs increased. My 390x seems to be stable at 1650 speed 25 mV Aux. Im trying to get past that speed though.

Well, she is stable at 1700 without me touching the aux voltage. Even at 1750, but if i can't increase my core clock then there is no reason to increase mem speed since i lose performance :/
post #6037 of 11736
Quote:
Originally Posted by Dundundata View Post

if it was unstable at 1700, why did you bump it up to 1750?

for memory you might be better off with 1625 than 1650, because of how the memory timings in the bios are setup. Even though 1650 is higher it uses higher/looser (worse) timings

Because I want to see what happens at 1750 haha
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post #6038 of 11736
Hey guys, ive OC'ed my msi r9 390 to 1120 core clock and 1625 mem clock. 50% power limit and +45 mV. I tested it with heaven and firemark and both went fine, no artifacts. But when I started playing Witcher 3, ive noticed minimal artifacts, so does this mean my oc is not stable? Should I put my core voltage higher? Is it safe to put it at 100?
post #6039 of 11736
Quote:
Originally Posted by sil130 View Post

Hey guys, ive OC'ed my msi r9 390 to 1120 core clock and 1625 mem clock. 50% power limit and +45 mV. I tested it with heaven and firemark and both went fine, no artifacts. But when I started playing Witcher 3, ive noticed minimal artifacts, so does this mean my oc is not stable? Should I put my core voltage higher? Is it safe to put it at 100?

Witcher 3 will have your GPU work like a mule. Seriously, mine can be stable at everything else and give artifacts in Witcher 3. So for me it has become the benchmark for stability testing. 15 minutes usually is all it takes too. Just watch those temps!

In fact, now that I think of it, do check your temps. Above 80C can cause instabilities on some GPUs, leading them to require more voltage, which in turn raises temps even further. The MSI in particular benefits greatly from good case airflow. In my case, ok airflow vs really good airflow is over 10C hotter.

Other than that, you'll need more core voltage. Although I'd also be looking at increasing aux voltage at this point. Memory overclocking isn't the greatest strength of the MSI cards. Mine barely does 1725MHz half stable. Game stable is another story.
post #6040 of 11736
Quote:
Originally Posted by tolis626 View Post

Witcher 3 will have your GPU work like a mule. Seriously, mine can be stable at everything else and give artifacts in Witcher 3. So for me it has become the benchmark for stability testing. 15 minutes usually is all it takes too. Just watch those temps!

In fact, now that I think of it, do check your temps. Above 80C can cause instabilities on some GPUs, leading them to require more voltage, which in turn raises temps even further. The MSI in particular benefits greatly from good case airflow. In my case, ok airflow vs really good airflow is over 10C hotter.

Other than that, you'll need more core voltage. Although I'd also be looking at increasing aux voltage at this point. Memory overclocking isn't the greatest strength of the MSI cards. Mine barely does 1725MHz half stable. Game stable is another story.

Should I put my voltage to 100? And what should I put on my aux voltage? I havent read a guide that tweaks aux voltage so i dont have any idea.
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