GPU UP Date 1080 Or 1080TI Plus Physics.

Any issues, problems or troubleshooting topics related to computer hardware and the Prepar3D client application
Larry A
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Joined: Mon May 21, 2018 11:42 am

GPU UP Date 1080 Or 1080TI Plus Physics.

Postby Larry A » Mon May 21, 2018 1:15 pm

Please excuse the long post. Thank you for reading and replies.
Issue with the GTX 780 S.C. has 3GBs of memory. Prepar3D v3 No issues. Prepar3D v4 had a issue with the GTX 780 S.C. 92 percent to 100 percent load Prepar3D v4 closing. Memory 95 Percent to 100 percent load. Fixed the issue by adjusting the Auto Gen Sliders. Current drivers, read the fix post concerning how to fix related issue. Current Load 80 to 100 percent. Memory 2.3 GBs to 2.8 Gbs depending on load. Completed flight KMRY to PAJN. A few texture tiles loaded a bit slow (popping} needs to be better. Due to the 780 S.C. GPU? Temps 80c to 86c.

Need to Purchase either or?
GPU 1080 8 GBs of memory.
GPU 1080 TI 11 GBs of memory?

With a GTX 780 S.C. for second monitor The 1080 or 1080 TI would clock down to the 780 S.C.? Sure this would be correct. 2 different specifications.
Install the 780 S.C with a 1080 or 1080TI for a dedicated Physics Card?
780 S.C for a door stop.

Prepar3D Virgin Install. Weather default clear skies. A2A Comanch 250 GTN 650 KMRY To PAJN Completed.
O.S. 7 Ultimate 64 Bit.
System:
M/Board Rampage lV Black Edition will run up to 3 GPUs at 16X
I7 4930K O.C. 4.4 GHz CPU Load 52% over all 6 Cores.
GPU GTX 780 S.C. Load 80 to 100 Percent. Memory load 2.3 GBs to 2.8 GBs
Monitor 32 In Ultra Wide resolution 3440 x 1440 at 60Hs.

Thank You
Larry A

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downscc
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Re: GPU UP Date 1080 Or 1080TI Plus Physics.

Postby downscc » Mon May 21, 2018 5:43 pm

I'm under the impression that P3D does not use the PhysX module, not sure how it could put something that was designed for shooter games to effective use. I've never installed it with my NVidia display driver and it's not had an impact.
Dan Downs
KCRP

Larry A
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Joined: Mon May 21, 2018 11:42 am

Re: GPU UP Date 1080 Or 1080TI Plus Physics.

Postby Larry A » Tue May 22, 2018 12:08 am

Wasnt sure about using the 780 S.C for a physics card. With the same settings the load factor would be less on a 1080 TI compared to a 780 S.C.? 90% on the 1080TI?

Dan appreciate your reply.

Larry A

AnkH
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Re: GPU UP Date 1080 Or 1080TI Plus Physics.

Postby AnkH » Tue May 22, 2018 11:59 am

Basically, everything below 99% load is bad for a GPU and only indicates, that something else is limiting your GPU from running at full strenght. This is not the same as for a processor. Means: if you already see "only" 80% load on your GTX 780, you will see lower loads on a 1080(Ti) without gaining a single FPS. If you see your GTX-780 running constantly at 99% or even 100%, upgrading to a 1080(Ti) might (!) provide you some additional FPS.

As P3D still depends greatly on a fast CPU, the classic approach to test if your GPU is the bottleneck is a little bit tricky, but it should still work: simply compare your FPS using the same settings but different resolutions. Verdict: if your P3D has significant (!) higher FPS with 720p compared to your native 3440 x 1440, an upgrade of the GPU might make sense. If you see more or less the same FPS with 720p and 3440 x 1440, the limiting factor is not the GPU but something else (most probably the CPU).
------------------
Chris

Hardware: i7 8700K@5.0GHz, 2x16GB DDR4 3200MHz RAM, Gigabyte Aorus GTX-1080Ti OC, Samsung SSDs (256GB for OS, 1TB for P3D), Windows 10 Home

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Brady Butler
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Re: GPU UP Date 1080 Or 1080TI Plus Physics.

Postby Brady Butler » Tue May 22, 2018 12:31 pm

To add to AnkH's input, there's a possibility that a GPU may be throttling itself down due to overheating. "Throttling down" meaning that the GPU is doing less work in an attempt to control the temperature of the GPU. This could cause GPUs to never reach the thresholds mentioned in his post. In some cases an 80-95% load could be all the GPU can handle before it starts overheating and throttling down (this could be due to poor airflow).

To be clear I'm not saying that this is happening with your hardware, it's just another aspect of GPU performance to consider.

Regards,
Brady
Brady Butler
Prepar3D® Software Engineer

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Rob Ainscough
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Re: GPU UP Date 1080 Or 1080TI Plus Physics.

Postby Rob Ainscough » Wed May 23, 2018 5:28 pm

Hi Larry,

You might want to wait 4-6 weeks if you can, my understanding is nVidia are going to release their next gen GPU (announce it in June with release to retail in July).

Bitcoin scam is starting to fall apart (it's value is dropping like a rock another $400 in one day) which means the desire for GPU's is also dropping and bringing them back to "retail" prices.

Dedicated Physics card will not help at all ... the improved CUDA support in P3D V4.x will help with 10 series and beyond GPUs ... i.e. water = Ultra.

80c to 86c shouldn't trigger throttling, over 90c might for the GPU, over 105c for the CPU will also trigger throttling assuming you haven't done anything to override throttling.

If I were in your position, I'd wait 4-6 weeks, get the next gen GPU and dump the 780 and just use the one new next gen GPU. If heat is a problem, look into water cooling solutions they can be a much cheaper solution to getting higher and more stable performance if you plan to OC anything (CPU or GPU).

Cheers, Rob.
Rob Ainscough http://www.p3dWiki.com
Prepar3D Forum Global Moderator


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