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Adam (-pXd-)
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Apr 8 2016, 10:47 AM (184 w, 2 d)

Recent Activity

May 26 2016

Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

Just downloaded latest from builder.blender.org

May 26 2016, 2:52 PM · BF Blender
Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

Just tested new drivers (368.22) on the EVGA 980ti and EVGA 760.

May 26 2016, 2:19 PM · BF Blender

May 23 2016

Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

@Brecht Van Lommel (brecht) Thanks for the update, looking forward to getting this sorted!

May 23 2016, 12:20 PM · BF Blender

May 17 2016

Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

Let me know if you want me to do any specific linux tests with my same Win 10 standalone 980ti rig, I'll just boot into a live/persistent usb.

May 17 2016, 9:29 AM · BF Blender
Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

I have just logged the results of my testing to a file so I could analyse them in Excel.
I re-ran the test again on 2.73, 2.76 and 2.77
Render time:
1:05, 1:19, 2:02
Average Memory Controller Load (%)
30.1%, 28.2%, 17.6%
Average Power Consumption (% TDP - 'Thermal Design Power'......apparently)
59.4%, 57.2%, 53.8%
I plotted render time vs power consumption and memory controller load - and there is a good correlation with a linear least squares fit (especially for render time vs Memory Controller load which has an r-squared value greater than 0.99).
It seems that the memory controller loading is much lower in 2.77 compared to 2.76 and 2.73. The power consumption of the card is also much lower (meaning it is being underutilised?)
I guess what this data does not answer is whether the lower memory controller load and power consumption is the cause of the longer render time - or a consequence of it.

May 17 2016, 1:40 AM · BF Blender

Apr 18 2016

Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

Alicja (Alicja)
Textures take up VRAM, though you're running 3X 980ti, you only have 6gb total (less what windows is using).
A combination of texture size, particles and poly count add up quickly and can easily saturate 6gb.
If the scene is too big to fit within your 4-6gb limit the render will fail with the Cuda memory alloc error.
Split your scene up into layers, render with a transparent background, and composite them in the nodes compositor or photoshop/gimp if possible.

Apr 18 2016, 1:26 AM · BF Blender

Apr 16 2016

Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

Hmmm strange. I have a very complex scene and the viewport cycles preview renders very quickly on the EVGA 980ti.

Apr 16 2016, 3:05 PM · BF Blender
Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

Interesting. I'm using Precision to manage both my cards also. On default rendering in IRay the fans spin up.

Apr 16 2016, 1:37 PM · BF Blender

Apr 15 2016

Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

@Sergey Sharybin (sergey) Sharybin (sergey)

Apr 15 2016, 10:08 AM · BF Blender
Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

@Sergey Sharybin (sergey) Sharybin (sergey)

Apr 15 2016, 1:27 AM · BF Blender

Apr 13 2016

Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

Thanks for the update Sergey.

Apr 13 2016, 1:15 AM · BF Blender

Apr 8 2016

Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

Joel; Interesting tests. We only have the Ti here, not a TitanX. I would prefer to see similar tests using Windows7 or Linux though. In every Blender release we add features or update or optimise things. Sometimes a change causes slowdown in 1 GPU type in surprising ways. This is why we make test builds and "Release Candidates" before releases. People with high performance expensive cards can help us by doing a test once a while.
Adam (and everyone sharing info here): don't forget to mention precise specs, especially OS version and card brand.
BTW: I am not working on this, it's Sergey who checks the 980 Ti. He was busy on other tasks as well, like fixing bugs and doing 2.77a. I expect he has time for this very soon again.

Apr 8 2016, 11:34 AM · BF Blender
Adam (-pXd-) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

Has Ton made any progress with this after he received the 980ti?

Apr 8 2016, 10:53 AM · BF Blender