Jan 16 2019
Jan 15 2019
May 16 2016
I'd like to also add that Windows 8.1 works too, Just as good as Windows 7.
Apr 1 2016
Just a quick update.
We've run some tests on the card yesterday. On Linux 980Ti is roughly 15-20% faster than 980 (which is kinda expected, because top-range is not linear scale in terms of buck-per-performance, it has much more ram tho :) Linux results i've put to the spreadsheet.
We also tested the card on Windows 10 machine. Once all the Windows glitches were solved by wipe-installing it from scratch, we set all power policies to Maximum Performance, but even then BMW27 scene was 3 times slower.
In both cases we used 2.77 release. From our code perspective it means that while parameters might be not optimal, they do work quite well on Linux.
Next step we'll try to test the card on Windows 7 machine here. Then it'll be more clear if it's Linux vs. Windows or Win7 vs. Win10 and so.
P.S. While googling around for tunable performance parameters got quite reasonable amount of forums where people were complaining about dropped FPS in games after updating to Win10.
Mar 16 2016
Okay I may have come to some conclusions for myself, I installed Windows 8.1 and my render speeds with the Evga 980ti where fast (even a tad faster than Windows 7.) And looking into my motherboard (its the ASUS Z9PE-D8 WS.) I've found that the latest officially supported OS was Windows 8.1. Even though everything else seemed to run fine on Windows 10 I'm wondering if maybe my issue is the Motherboard drivers not officially supporting it? Maybe others with slow render speeds should check there MB's drivers and make sure there officially supported.
Mar 14 2016
@Steve Lund (webhead), who is the vendor of the card?
@Steve Lund (webhead), @maris (maris), why don't you put results to a spreadsheet linked above? That would help a lot gathering bigger picture.
As for performance level -- it's not in an application control, so it's something specific to a driver or driver settings.
Mar 8 2016
Ok Interesting.... Just to add to the confusion, running Windows 7 Pro on my desktop I get over twice the speed with my EVGA 980ti. Also on complex scenes my Nvidia driver would crash on Windows 10 and not render at all, but seems to work fine on Windows 7.
Feb 28 2016
@Brecht Van Lommel (brecht) Mike's and Rian's results in the spreadsheet should confirm that the display performance isn't the issue effecting the GPU speed.
Feb 26 2016
Feb 25 2016
@Sergey Sharybin (sergey) Yes, the core and memory speeds are low (around 200mhz) before and after rendering. Also I'm using the standard EVGA 980Ti 6gb.
Feb 24 2016
Here's my GTX 980Ti under rendering workload.
Okay I can confirm that the driver version makes no difference between 358.91 and 361.91.
That's interesting Mike, the only difference I see is your using a slightly older driver and Windows 7. Here is all my information:
Feb 23 2016
I'd also like to help in any way possible, although I don't have much experience building Blender. I apologize if I went off topic comparing the new GTX 980ti to the older 970 on this task, I don't have a stranded 980 to compare with.
Feb 22 2016
Running some more tests, there is a nice speed increase on both the GTX 980ti and 970 with the latest Blender 2.77 test 2 build. But the older 970 still renders about 25% faster than the new GTX 980ti on a scene with SSS, and rendering Mike Pan's Benchmark the 970 was still 40 sec faster. Also when rendering with the GTX 980ti I got this error twice: CUDA Error at cuctxcreate: launch exceeded timeout. Does this info help at all?
I can also confirm that after installing a new GTX 980TI 6gb, Blender Cycles actually renders slower than it was with my GTX 970. Has there been any update on this? Is this still a known issue?