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[Official] NVIDIA GTX 1080 Ti Owner's Club - Page 1424

post #14231 of 15837
Been busy at work, but has anyone else had tried overclocking 1080Ti's in SLI? I left the voltage alone and I haven't passed 2025 MHz in SLI with both cards synchronized. Disabling the synchronization does not seem to push clocks forward past 2025 MHz. Temperature of the top card was 71C and this was on a hot day when I tested (room temps were likely in excess of 25C). Just tried and +325 MHz seems to be the best they can do together in SLI.

I have not tried yet, but I might try pushing the VRAM more, as that seems more likely to do something than trying to squeeze 25-50 MHz out of the core. If anything, undervolting the core seems like the best option. I wonder if it is overvolting the VRAM. I don't think that it is worth overvolting the core. On that note, it seems like overvolting the core or the "Shunt" mod turns a 300W card into a 400W card with gains of performance in the single digits (essentially the 1080Ti equal to turning your RX 480 into a 580, with perhaps even worse gains from a performance gained vs energy used POV).

The main reason to get third party cards is the cooler and I guess having overkill VRM helps ensure maximum VRM efficiency (as opposed to VRMs at higher temperatures). In any event, the premium isn't too big - $50 to $120 USD for a premium GPU like the Aorus or Lightning. The only other option is something like the Raijentek Morpheus, which easily costs as much and doesn't offer a VRM upgrade.







For those that need a guide for Memtest G80:
https://github.com/ihaque/memtestG80

I think that if you run 2 instances of CMD, and flag it, for example,


Instance 1:
MemtestG80.exe 1024 1000

Instance 2 of CMD (open up a new command line to do this):
MemtestG80.exe 1024 1000 --gpu 1 g1


This should allow you to run both at once in SLI (a useful trick if you want to spend less time checking for stability).





Quote:
Originally Posted by Blameless View Post

Does consumer pascal even have any ECC enabled? Querying the card with nvidia-SMI seems to suggest not, but maybe it's not being reported correctly.

In my experience, eight instances (this is important, because it takes at least 4-6 to saturate the memory controller) of MemtestG80 will find unstable memory on my part much faster than any test I've tried. I don't have FFIV, but I do use the FFXIV Stormblood benchmark in a loop to stability test...at ~65C, 6048 memory will produce errors in MemtestG80 inside 5-10 minutes, but I can loop Stormblood bench at 4k for several hours before running into issues.

Temperature is also important. MemtestG80 will not pull as much power as graphically intensive tests, so pump/fan speeds need to be reduced to make sure the memory is hitting worst case temperatures.

Regardless, ensuring no errors are reported and that performance is still scaling correctly with increased memory clocks should be a very strong indicator that the memory is stable and that any ECC, if present, isn't confusing things.

Interesting read for those who want to know about MemtestG80's error checking abilities:
http://www.cs.stanford.edu/people/ihaque/posters/sc-2009.pdf

Alongside HCI Memtest, for DRAM, it may be one of the best error finding tools in WIndows.


ECC is disabled by default on consumer GPUs. If you were to run Nvidia's deviceQuery, you'd get something like the following:

https://devtalk.nvidia.com/default/topic/1000116/driver-for-gtx-1080-ti/

Quote:
Device 0: "Graphics Device"
CUDA Driver Version / Runtime Version 8.0 / 8.0
CUDA Capability Major/Minor version number: 6.1
Total amount of global memory: 11169 MBytes (11711938560 bytes)
(28) Multiprocessors, (128) CUDA Cores/MP: 3584 CUDA Cores
GPU Max Clock rate: 1582 MHz (1.58 GHz)
Memory Clock rate: 5505 Mhz
Memory Bus Width: 352-bit
L2 Cache Size: 2883584 bytes
Maximum Texture Dimension Size (x,y,z) 1D=(131072), 2D=(131072, 65536), 3D=(16384, 16384, 16384)
Maximum Layered 1D Texture Size, (num) layers 1D=(32768), 2048 layers
Maximum Layered 2D Texture Size, (num) layers 2D=(32768, 32768), 2048 layers
Total amount of constant memory: 65536 bytes
Total amount of shared memory per block: 49152 bytes
Total number of registers available per block: 65536
Warp size: 32
Maximum number of threads per multiprocessor: 2048
Maximum number of threads per block: 1024
Max dimension size of a thread block (x,y,z): (1024, 1024, 64)
Max dimension size of a grid size (x,y,z): (2147483647, 65535, 65535)
Maximum memory pitch: 2147483647 bytes
Texture alignment: 512 bytes
Concurrent copy and kernel execution: Yes with 2 copy engine(s)
Run time limit on kernels: Yes
Integrated GPU sharing Host Memory: No
Support host page-locked memory mapping: Yes
Alignment requirement for Surfaces: Yes
Device has ECC support: Disabled
Device supports Unified Addressing (UVA): Yes
Device PCI Domain ID / Bus ID / location ID: 0 / 3 / 0
Compute Mode:
< Default (multiple host threads can use ::cudaSetDevice() with device simultaneously) >


deviceQuery, CUDA Driver = CUDART, CUDA Driver Version = 8.0, CUDA Runtime Version = 8.0, NumDevs = 1, Device0 = Graphics Device
Result = PASS
watts@Magnus:~/NVIDIA_CUDA-8.0_Samples/1_Utilities/deviceQuery$

Only the Quadros have ECC and of course the Nvidia HBM cards.






Quote:
Originally Posted by Blameless View Post



Just make sure "CUDA - Force P2 State" is set to off in the global driver profile.


Yep. Fun tip: you get some modest gains (at the expense of power consumption) if you disable the P2 state in mining:

http://cryptomining-blog.com/tag/p2-power-state-in-compute/

I'm not sure it is great though from a mining gained versus power consumption POV though. GDDR5X as a whole seems pretty awful for mining.







Quote:
Originally Posted by RevanCorana View Post

Is getting a 1080ti still worth it? How far off is Volta you think?


I lean towards the yes for a few reasons.

We don't know what consumer Volta will look like. I strong suspect though that we will see a GTX 1080 sized Volta (or at most GTX 980 sized so around 400mm^2) and only shortly after a larger Titan Volta. It will take another 8 months or so afterwards before the GTX 1180Ti (or whatever they call it) comes out. So that might be well into 2019. The only time that would change is if AMD's Navi is as good as we hope - then that might force Nvidia's hand.









Quote:
Originally Posted by mgoldshteyn View Post

I am running an SLI configuration of a pair of EVGA 1080 Ti SC2 Hybrid Gaming cards on Windows 7 with the latest nVidia drivers. I've run about 8 days of 24/7 compute on both cards and noticed that their ability to overclock has drastically gone down from the time I purchased them.

When I first got the cards, I could easily get 2,050 MHz stable, even at 1.050 V. Now, I can't even get 1,900 MHz on either card, regardless of voltage/power. Is it possible that by running at 120% power and max voltage (configured by setting K Boost on and raising the voltage slider all the way up using EVGA Precision XOC), I actually managed to damage the hardware in both cards?

Why else would the cards degrade so rapidly after only about 8 days of total compute time? I now get crashes just starting EVGA Precision XOC with K Boost turned on, even though it is defaulting to a 0 MHz offset, which results in something like 1,931 MHz / 1,961 MHz on my two cards, respectively. Adding voltage only results in the cards crashing sooner. Temperatures are great, both GPU, Memory, power regulation. Everything is staying below 60 C at load, with GPU temperatures much lower (e.g., 50 C).

I am testing 1,850 MHz with 1.000 V right now, since I can't even get the 1,900s to work at any voltage and higher voltages (e.g., >1.025 V) only cause crashes sooner. I have switched to MSI Afterburner, because I can't even get EVGA Precision XOC to come up without halting the OS. Afterburner comes up with the cards clocked to a locked 1,900 MHz, that I've set, so I at least have a chance to try new settings. But, running at 1,900 MHz at any reasonable voltage ultimately results in a system halt after anywhere between 30 mins to 4 hours.

I am wondering if one of the following two things has occurred:
  • Electromigration damaged the hardware of the cards. I know this sounds impossible after such a short period of 24/7 running and given that the max voltages were still bound by the 1.093 V cap, but the behavior I am seeing is very similar to the way my Pentium 4s behaved when overvolted/overclocked and having experienced electromigration (i.e., See: Sudden Northwood Death Syndrome (SNDS)).
  • The thermal compound that EVGA uses on their SC2 Hybrid Gaming cards has somehow worn down (but the temps are still low, so I doubt this happened).

If anybody has any ideas on what happened or what I can do to fix things, I am all ears.


Sounds like eletromigration to me. It's actually a risk with the overvolting and "Shunt" mod IMO.
Edited by CrazyElf - 9/30/17 at 7:39am
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post #14232 of 15837
Thread Starter 
Quote:
Originally Posted by Radox-0 View Post

thermal grizzly kryonaut is not liquid metal, that would be Thermal Grizzly Conductonaut.

Kyronaught itself is as easy as other TIM to use.

I prefer Mastergel Maker Nano over Krynonaut. Performs a bit better and much easier to apply.

My new go to paste. smile.gif

http://www.enostech.com/mastergel-makel-paste-review/
    
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post #14233 of 15837
Thread Starter 
470 iterations of a 1000 of MemtestG80 at 1024MB, 8 instances running (I'm running Twitch in the background in Chrome to keep me entertained) and zero errors at 6162MHZ memory, 2075 core. jump one bin higher on memory and get errors though and ambient temps are quite low right now. biggrin.gif

Summer temps I'm pretty sure I'd settle at 6142 I normally run my card at 24/7. redface.gif
    
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post #14234 of 15837
Does anyone know if this 'MemtestG80' is known to work correctly on GDDR5X ?
Edited by WillG027 - 9/29/17 at 8:23pm
post #14235 of 15837
Quote:
Originally Posted by WillG027 View Post

Does anyone know if this 'MemtestG80' is known to work correctly on GDDR5X ?

It does but ymmv. It didn't catch memory ECC resends for my gpu because the point mine throws out detectable errors is beyond the VRAM stability and performance loss inflection point.
post #14236 of 15837
Quote:
Originally Posted by CrazyElf View Post

For those that need a guide for Memtest G80:
https://github.com/ihaque/memtestG80

I think that if you run 2 instances of CMD, and flag it, for example,


Instance 1:
MemtestG80.exe 1024 1000

Instance 2 of CMD (open up a new command line to do this):
MemtestG80.exe 1024 1000 --gpu 1 g1


This should allow you to run both at once in SLI (a useful trick if you want to spend less time checking for stability).

Good tip for SLI users, though you'll want to run many more than two instances.

I normally run eight or nine on my 1080 Ti and have found it impossible to get full memory controller load with less than six.
Quote:
Originally Posted by CrazyElf View Post

Interesting read for those who want to know about MemtestG80's error checking abilities:
http://www.cs.stanford.edu/people/ihaque/posters/sc-2009.pdf

Interesting slide, sums up the relevant memtestG80 dev comments nicely.
Quote:
Originally Posted by CrazyElf View Post

ECC is disabled by default on consumer GPUs. If you were to run Nvidia's deviceQuery, you'd get something like the following:

https://devtalk.nvidia.com/default/topic/1000116/driver-for-gtx-1080-ti/
Only the Quadros have ECC and of course the Nvidia HBM cards.

nvidia-smi states as much as well.
Quote:
Originally Posted by CrazyElf View Post

you get some modest gains (at the expense of power consumption) if you disable the P2 state in mining

It's worth it. Hash rate goes up ~5% for a similar increase in power consumption.
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post #14237 of 15837
Does the FE 1080 Ti really not have a VRM temp sensor? Got my 1080 Ti 2 weeks ago, at first I just shrugged when I'd seen there's no VRM temp reading in GPU-Z, but now that I think about, it seems really odd.
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post #14238 of 15837
Quote:
Originally Posted by Alexium View Post

Does the FE 1080 Ti really not have a VRM temp sensor? Got my 1080 Ti 2 weeks ago, at first I just shrugged when I'd seen there's no VRM temp reading in GPU-Z, but now that I think about, it seems really odd.

New VRM sensor. Reason stupid move by Nvidia. Would be feeling better if I know how hot the VRM run.
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post #14239 of 15837
Quote:
Originally Posted by Alexium View Post

Does the FE 1080 Ti really not have a VRM temp sensor? Got my 1080 Ti 2 weeks ago, at first I just shrugged when I'd seen there's no VRM temp reading in GPU-Z, but now that I think about, it seems really odd.

Nvidia has not had VRM sensor for ever .
However there are a couple of board partner cards that have some VRM sensors such as MSI Lighting,EVGA's new iCX range cards.
post #14240 of 15837
Evening,

Anyone know how to manually force a voltage lower than 800mv? (on a 1080 TI FE).

800mv (0.8v) is the lowest on the 'curve window' in MSI Afterburner!

Any help would be much appreciated!

Thanks,

Nick Peyton








Quote:
Originally Posted by s1rrah View Post

I happen to have a bunch of these laying around from earlier this year when I was planning on re pasting my Alienware 17 Pascal machine ...

...



...

Here's a link; stupid cheap too: https://www.amazon.com/gp/product/B00E5SMY0W/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

I never got around to using them on the Alienware laptop as my temps have never caused throttling of either CPU or GPU on that (ridiculously great) machine ... so do you think these might work in place of thermal pads on a MSI Seahawk 1080 ti? I would most likely use a small layer of thermal paste on both sides of the shim ...

My only worry is that they would not have any "give" and that the CPU block might not make good contact with the GPU die

Great idea ... copper shims have *got* to be many times better than any thermal pad if contact is right...

thumb.gif

I tried this (replaced pads on my GDDR5X memory chips with these on my 1080 Classified last round) and temps weren't any better. In fact it created more problems than it's worth. Due to there being no *give* you end up with a few memory chips having excellent temps while others absolutely appauling. The pads are designed to absorb the difference in height between different components. Also any good pad will also compress to at least 50% it's original height. So a 0.5mm pad is really only a 0.25mm pad. It also just seems to "absorb" the whole GDDR5X chip surface better than the copper shim. If we were talking about much bigger pad sizes then it might offer an improvement. But not at the heights we are working. I've tried it. Numerous times.



Even 3 w/MK ($2 for 10cm x 10cm) will do just as good as something 10x the price. You be very lucky to get 1c difference by going to 20 w/MK
Edited by nrpeyton - 9/30/17 at 5:26pm
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EK KIT P360 (Custom Water Loop) Microsoft Windows 10 Home, 64 bit ASUS PG278Q 850 Bronze 'be Quiet POWER ZONE' 
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Corsair Obsidian 750d Airflow 
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