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post #21321 of 21333
980 classy on air here. Clock is at 1539 without artifacts but I experience infrequent random crashes. Would bumping voltage up 30mV increase stability?

EDIT: I have now successfully flashed a tweaked bios and bumped voltage by 12.5mV and my ingame clock has been raised to 1547 with improved stability

Double EDIT: Ran Firestrike and it registered with a clock of 1562!!!
Edited by CCXr594 - 3/29/17 at 12:00am
post #21322 of 21333
Alright, so I recently got my custom loop setup. Temps are amazing. I haven't broken 40 degrees celsius yet with the benchmarking and stress testing that I've tried on the Graphics Card (EVGA 980ti classified). I also initially was able to get a relatively stable 1517MHz core clock in the stock BIOS without adding any voltage (although I haven't stressed that particularly hard). Anything higher seems to require some sort of voltage boost and this is where I started encountering problems:

I'm having a problem, however, with raising the voltage past 1.23V on vcore using either the voltage offset in afterburner or using the classified voltage tuner. I've been using a multimeter to check actual voltage and it is clearly adding an offset or setting a hard voltage. But as soon as I push it past 1.23V on the vcore it crashes or the system freezes. I've tried using the stock BIOS and a custom BIOS I made to push the core clock to 1443 MHz (which actually was less stable with an overclock) with no change. I've tried with and without a memory overclock with no change. The same problem occurs: ANY core clock above 1517MHz fails w/ a core offset and ANY core clock overclock with an overvolt using the classified voltage tuner instantly fails in a benchmark or stress test (changes in voltages are actually occuring when viewing on my multimeter).

Basically, on the stock BIOS (which has been the most stable BIOS I've tried), the core clock maxes out at 1517MHz, but I'm not able to get anything above that using voltage offsets or the voltage tuner. When I use the voltage tuner past 1.23v on vcore it is an instant crash which is making me think that something else at play here. It doesn't look like I'm hitting power limits even on the Stock BIOS, but I'm just generally confused. I have sooooo much thermal headroom right now and I'd like to leverage some of that if possible but it seems like there is something behind the scenes that is preventing that from happening. Any ideas of what might be going on?
Edited by boomerzangs - 4/7/17 at 9:42pm
post #21323 of 21333
Get an EVGA ProbeIt and DMM. Software voltage monitoring isn't reliable. Search the bios thread for Mr. Dark's Classy BIOS. In my experience anything past 1.25v starts hurting clocks and causing instability. You may be feeding the core more voltage than the software says it is.

Other than that, make sure you have heatsinks on your VRMs.
    
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post #21324 of 21333
Quote:
Originally Posted by paskowitz View Post

Get an EVGA ProbeIt and DMM.

That is exactly what I was using to measure voltage. The voltages I measured with my multimeter reflected what the voltages that I was telling the software to use whether it was an offset in Afterburner or voltages that were set in the classified voltage tuner.
Quote:
Originally Posted by paskowitz View Post

Search the bios thread for Mr. Dark's Classy BIOS. In my experience anything past 1.25v starts hurting clocks and causing instability. You may be feeding the core more voltage than the software says it is.

Thing is, I tried bumping it one step at a time up from 1.23v in the classified voltage tuner with no change except that it was crashing faster.

I'll have to try Mr. Dark's BIOS just for kicks but reading up on maxwell overclocking again, I realized that this is a problem above the 1.19-1.21v range for maxwell. I'm certainly happy that I got a nearly 80Mhz bump in game stable (-ish; haven't really put it through its paces yet in different games only stressing it looping different benchmark tools) but it seems like I have one of those cards that simply gets worse with higher voltages using ambient cooling.

Lastly, I'm using the EK full cover block for the 780, 780ti, and 980ti classy models which have spots for cooling the VRM's on the card.

Very interesting side note not related to GPU overclocking: I was able to get a stable 4.9GHz @ 1.35v vcore on my 4790k where previously I had not been able to achieve stability AT ALL.
Edited by boomerzangs - 4/7/17 at 10:25pm
post #21325 of 21333
Quote:
Originally Posted by boomerzangs View Post

Lastly, I'm using the EK full cover block for the 780, 780ti, and 980ti classy models which have spots for cooling the VRM's on the card.

After all that, it would seem so.
    
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post #21326 of 21333
Quote:
Originally Posted by paskowitz View Post

After all that, it would seem so.

Took another swing at it today with overclocking the GPU. Tried undervolting using the tuner and watching the voltages on the multimeter. Setting it around 1.16875 for core seemed to be the sweet spot with voltages on the multimeter going to ~1.18 during load. Anything over 1527 had visual artifacts or would crash, however. So it seems like ~1510's are the upper limit for ambient cooling on my card. If nothing else it runs really cool with no higher than 38C at load tongue.gif
post #21327 of 21333
Quote:
Originally Posted by boomerzangs View Post

That is exactly what I was using to measure voltage. The voltages I measured with my multimeter reflected what the voltages that I was telling the software to use whether it was an offset in Afterburner or voltages that were set in the classified voltage tuner.
Thing is, I tried bumping it one step at a time up from 1.23v in the classified voltage tuner with no change except that it was crashing faster.

I'll have to try Mr. Dark's BIOS just for kicks but reading up on maxwell overclocking again, I realized that this is a problem above the 1.19-1.21v range for maxwell. I'm certainly happy that I got a nearly 80Mhz bump in game stable (-ish; haven't really put it through its paces yet in different games only stressing it looping different benchmark tools) but it seems like I have one of those cards that simply gets worse with higher voltages using ambient cooling.

Lastly, I'm using the EK full cover block for the 780, 780ti, and 980ti classy models which have spots for cooling the VRM's on the card.

Very interesting side note not related to GPU overclocking: I was able to get a stable 4.9GHz @ 1.35v vcore on my 4790k where previously I had not been able to achieve stability AT ALL.


That block does cover most of the VRMS but the memory ones are not covered by that block. I have herd about mild success with adding some small heat sinks to the mem vrms. Here is a pic from earlier in this thread to the highlight area i am talking about.
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post #21328 of 21333
Quote:
Originally Posted by fasttracker440 View Post

That block does cover most of the VRMS but the memory ones are not covered by that block. I have herd about mild success with adding some small heat sinks to the mem vrms. Here is a pic from earlier in this thread to the highlight area i am talking about.

The memory VRM's are not an issue heat-wise. For a start 3 phases on memory is overkill. Reference design is only 1 phase. The EVGA components are also higher quality. So you're effectively getting 4/5x the capacity compared to reference design. My Classified hits +925 memory if I keep temps low.

Lucky if they hit 45c under extreme load.

Both EVGA & EK both agreed with that.

Bear in mind those VRM's are capable of hitting 125c and still functioning normally for prolonged periods of time. So there is physically nothing you could do, to ever cause any problem.

It really isn't an issue.

At most, adding heatsinks (as you mentioned) with a good fan on the bottom of your case blowing upwards onto the heatsinks wouldn't hurt. It may even lower the temps of the 3 GDDR5X memory chips closest to the VRM side of the card. (as heat transfers across components on the PCB).
I'd only go that far, if like me; you're addicted to getting the lowest possible temps. GDDR5X does actually respond nicely to lower temps, with regard to o/c stability ;-)

Edited by nrpeyton - 4/9/17 at 4:16pm
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post #21329 of 21333
Cooling those memory VRMs is only really an issue for those really pushing their system, typically benchers trying to eek out every last drop of performance alongside knife-edged stability.

With any kind of decent benching, the most common tactic is to put heatsinks on there and then mount up a fan of some kind aimed at it... But that's a scenario that's a lot more extreme than 24/7 usage of most types (probably even including BOINC and/or Folding@Home)
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post #21330 of 21333
Quote:
Originally Posted by WhiteWulfe View Post

Cooling those memory VRMs is only really an issue for those really pushing their system, typically benchers trying to eek out every last drop of performance alongside knife-edged stability.

With any kind of decent benching, the most common tactic is to put heatsinks on there and then mount up a fan of some kind aimed at it... But that's a scenario that's a lot more extreme than 24/7 usage of most types (probably even including BOINC and/or Folding@Home)

Yeah. The memory overclocking doesn't really seem to be what is impacting the stability. It is just the the GPU silicon is limited once I get past ~1520 on the core. Going back and reading up on maxwell again, my card is not really that far below the norm. The fact of the matter is that when using ambient temperature cooling, Maxwell does not scale with voltage. I would have to do some sort of subambient cooling to get better scaling. My card actually seems to benefit from undervolting in classified voltage tuner (set at 1.6875) where under load the vcore does not go above 1.2 volts gave me room to push the core a bit further (1535-1540) for benchmarking.

And yeah, I don't have enough time right now to invest in more hardcore solutions. I may come back to it later on when I move on from my 980ti to try and push it on a test bench (if I ever get that far). I'm mostly doing this to dial in a daily overclock for gaming and such. I've settled on backing it down to 1500/2052 for core and memory (with no voltage tweaking) for 24/7 use. This is fine for good fps on 1440p at relatively high settings.
Edited by boomerzangs - 4/10/17 at 10:44am
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