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post #6161 of 11614
Quote:
Originally Posted by tolis626 View Post

Dude... I know lower temps are supposed to help stabilize an overclock but that is ridiculous. 1245MHz at 1.24V? Mine won't do 1200MHz at 1.28V. Damn... Share your secrets with me! frown.gif

EDIT : Seeing as it's a particularly cold day (By Greek standards, at least. It's like 10C outside) and the house is like a fridge because I forgot to turn on the heating, I decided to relieve my frustration by benchmarking stuff, so that I could make the best of a situation. Only thing I managed to do is cause me even more frustration. Some of my results are the following : 1200/1625MHz at +125/+25mV, 1210/1625MHz at +150/+25mV and, my personal favorite 1225/1625MHz at +175/+25mV. I was at least happy that it didn't explode, because otherwise I'm ready to throw the thing out the window. Temps didn't break 66C on the core and 60C on the VRM (10-15C ambient, side panel off and fans blasting at 100% does provide substantial cooling it seems), so these aren't the issue. I can't for the life of me explain why my scores go further down the higher I go. There also was no artifacting as far as I could tell. And then there's this 1185/1725MHz at +100/+50mV run that obliterates (ok, I exaggerate here but still) all higher overclocks. Also, my memory refuses to do 1750MHz no matter how much voltage I throw at it. Boom, black screen or RSOD. Kind of ridiculous, really. 1725MHz is fine for anything other than prolonged gaming.

So... Any ideas are welcome. Both for overclocking/benchmarking and anger management.

EDIT 2 : Did a suicide run at 1225/1725MHz at +200/+25mV. Still, no go. 14400 plus change. What the...?

I noticed the same thing, I was increasing/lowering voltage and core speeds one at a time and still couldn't figure it out.. At some point there seems to only be more harm than good from extra voltage, it seems anything past +150mV for me gives very little if any benefit it at all.

Also if I game for extensive time at like +175mV or +200mV, I eventually just get a black screen and have to reset my BIOS to get picture out again.
Weird... I'm thinking maybe the PCI-E lane can't handle the juice or something this thing eats at +200mV.

EDIT: Just to clarify, my Core stays at 45C or below at all times even at +200mV and VRM doesn't go higher than 75C at +200mV.
I don't think improving the temps much further would help my case very much atleast, maybe. There isn't much I can do to try improve them anyway from this point on.

Just need to open the block up and confirm it's making contact between the GPU block and the heatsink itself as some users have reported in the Alphacool GPX thread that their blocks are actually making zero contact with the heatsink itself! Could explain my high VRM temps before a few fixes aswell.
Edited by Stige - 2/11/16 at 7:55am
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I5-6600K @ 4.7GHz MSI Z170A Gaming Pro Carbon ASUS Radeon R9 390 (1200/1650) 2x4GB 2666MHz 
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Samsung 830 128GB Phobya Custom Water Windows 10 QNIX QX2710 @ 120Hz 
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post #6162 of 11614
Quote:
Originally Posted by tolis626 View Post

I know it's the lottery. By "secrets", I meant to teach me how to win the damn lottery. tongue.gif

On a more serious note, the only thing keeping me from slapping an AIO or something on my card is that its resale value will tank completely. Or at least I think it will. Maybe I'll change my mind about that as summer approaches. Temps do improve things a lot for GPUs, so I do not think 1200MHz is out of the realm of possibility for 24/7 operation under water. For how long that would work... That's another story. I have no idea how fast voltage and current can damage a GPU, but I tend to think that if temps are in check it's all fine, really.

Other than that, do you have any ideas why my scores suck so bad? I mean, they're not bad per se, but I see marginal improvements over 1150MHz and even a regression in performance over 1185MHz. Is it just that these GPUs hate voltage that much? I hoped not as long as temps aren't the issue...

There does seem to be something of diminishing returns on these. But I think it is temperature related. If you get your card cooler try running the higher volts and see what happens. That's my theory anyway. As I got the core colder then it seemed to increase stability and I could go for higher clocks, that's the only reason it went to 1245mhz because the core was under 50c. That said, there is going to be a trade-off at some point.
     
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post #6163 of 11614
Quote:
Originally Posted by battleaxe View Post

There does seem to be something of diminishing returns on these. But I think it is temperature related. If you get your card cooler try running the higher volts and see what happens. That's my theory anyway. As I got the core colder then it seemed to increase stability and I could go for higher clocks, that's the only reason it went to 1245mhz because the core was under 50c. That said, there is going to be a trade-off at some point.

This...temps definitely played a part. In my testing on air before my block arrived, I could get it up to about 1250ish. My cap was more temp related though, as I could tell there was more there. Under water, I can hit as high as 1330 on firestrike / heaven runs.
post #6164 of 11614
it's not temps, from discovery on the bios editing thread it's mainly power related.

EDIT: wait well yeah... higher clocks you need a lower nominal temp for stability, lower then the highest you would consider stable for whatever clocks you use without a voltage adjustment. like i use 1100/1625 24/7, my fan curve goes:


but when i take it up to 1175/1750 with +125mv on the core.... i don't chance anything and just fix it to 100%
Edited by navjack27 - 2/11/16 at 8:35am
post #6165 of 11614
Count me in. 😄




post #6166 of 11614
Can't get 1200 core on my 390x even at +60 core. I get artifacts, so I gave up. Great card either way, freesync is the ****!
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post #6167 of 11614
Quote:
Originally Posted by THUMPer1 View Post

Can't get 1200 core on my 390x even at +60 core. I get artifacts, so I gave up. Great card either way, freesync is the ****!

Try +100-150.
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Ishimura
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post #6168 of 11614
Quote:
Originally Posted by THUMPer1 View Post

Can't get 1200 core on my 390x even at +60 core. I get artifacts, so I gave up. Great card either way, freesync is the ****!

might be talkin out my ass here but not many with a 390x go that high... and if they do its just for QUICK benchmark runs and then they douse their cards with water and ice to shock it out of fever and delirium.
post #6169 of 11614
Quote:
Originally Posted by Lixxon View Post

Oh any special reason it should be +50 power limit always? Never heard aboutt memory straps is that specific speed that has to be? ( I cant put 1635 for example?)

Power Limit maxed will allow the card to pull what it needs to. And not to be limited by power starvation.

Unless you modify your BIOS's Memory timings, 1625 will be better than 1635. You can just test it. thumb.gif
post #6170 of 11614
Quote:
Originally Posted by navjack27 View Post

might be talkin out my ass here but not many with a 390x go that high... and if they do its just for QUICK benchmark runs and then they douse their cards with water and ice to shock it out of fever and delirium.

LOL... thumb.gif
     
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