Affinity Mask, NVIDA Config, And More …

A day of tweaking today. The sim’s performance is pretty good – really good, actually – but I can tell when it’s stressing the CPU and GPU and the photorealistic scenery just isn’t quite as beautiful as I know it should be. With the benefit of an early start this morning I was poking around this thread on AVSIM, and as a result today’s tweaks are in two groups: processor and graphics.

In terms of the processor, I’ve been running the quad-core CPU with hyper threading on but no affinity mask and no core dedication for the add-on software (Active Sky Next, the Flight1 GTN 750 GPS, and Multi Crew Experience). After reading the AVSIM thread I set my affinity mask to 116 in the P3D.cfg file, then downloaded Process Lasso and used it to assign the add-on software to virtual cores 1, 6, and 7. This was all seamless and easy, and Lasso really is a very cool piece of software.

Then it was time for graphics. A few weeks ago I found this thread in the ORBX forums, and after making those changes then to both my P3D.cfg file and my NVIDA Control Panel I had really good performance from the sim. One key (I think) was using the NVIDIA Control Panel to set the VSync to “Adaptive 1/2 Refresh Rate,” which would make the refresh rate 30 frames per second on my 60 hz monitors. One of the things I’ve learned over the past couple of months is that you want your PC and your monitors synced up, both displaying at 30 FPS or 60 FPS or whatever it may be. Given that 30 FPS is realistic for my setup (and movie-quality besides), that’s what I’m shooting for.

So this morning I figured I’d take the advice in the AVSIM thread, set my P3D settings to VSync “on,” triple buffering “on” and FPS to unlimited, set the frame rate limit to 30 in NVIDIA Inspector, and turn off the VSync adaptive setting in NVIDIA Control Panel. The result was that my frame rates absolutely tanked. As in six or seven frames per second, tanked. Abysmal. At first I thought maybe it was the affinity mask / Lasso settings, so I backed up on those. No difference. So then I took the sim’s graphic settings back to default. No change. So then I returned the NVIDIA Control Panel and Inspector back to default, and my frame rates with high settings and some pretty hefty Active Sky Next weather were back to 45-60 frames per second.

So the problem was clearly in the NVIDIA settings. I started to re-tweak with the Inspector limit at 30 fps, and that was clearly the problem – frame rates immediately dropped back to six or seven frames per second. I don’t know why that would happen, give that I had no other limiter on frame rates, but happen it did.

In the end, I cleared all settings back to the P3D defaults in NVIDIA Inspector. In NVIDIA Control Panel I fixed my settings consistent with the ORBX thread (including setting VSync to 1/2 adaptive, which should = 30 fps for my monitors). In Prepar3d I set VSync “on,” triple buffering “on,” and frame rates “unlimited.” This flew very well – the scenery was beautiful, actually – but there were some serious stutters when making steep banking turns, as well as on approach. I set the frame rates as limited to 30 fps in the sim, and things were then smooth a silk. Gorgeous textures (amazing, really, even far out – this is P3D v 3.2 at work, perhaps?), and great frame rates set at 30 fps, dropping only to 17-14 fps or so on final approach into KSLC, with maxed-out texture and mesh settings, traffic, scenery at max, and several sets of clouds from Active Sky Next. Most important, visuals were smoooooth – gorgeous photorealistic textures, and wonderful performance all around. It really was beautiful to look at.

So, it was a day of tweaking, and some real learning went on, but in the end things look and work great. I took a few flights around KSLC after all was said and done, and they were completely fulfilling. A ton of fun, and a reminder of what a great sim flight can feel like.

Post Script: Serious props to SteveW in the AVSIM forums, who has a site here, and Patrick Jorand in the ORBX forums.

5 thoughts on “Affinity Mask, NVIDA Config, And More …

  1. Hi,

    I’m well underway putting my sim together but I’m having all sorts of performance issues with X-plane 11 and Nvidia GTX 1080. My frame rates are very low (<20), even with medium-low graphics settings in x-plane. I can get ~30fps with the lowest settings possible.

    Did you get the same super smooth performance when you used the same GPU settings with X-plane 11 or was some additional tweaking required?

  2. I didn’t tweak a thing for X-Plane. No affinity mask, default NVIDIA settings. It runs great out of the box for me. Ensure you have the latest NVIDIA drivers and the latest X-Plane beta. And your CPU is a big part of this, as XP relies about equally on both the CPU and GPU.

    1. Thanks for that, good to know. I too ran all settings etc pretty much straight out of the box. I have the latest NVIDIA drivers, but the CPU is a few years old (even though it’s a Xeon).

      Is there an easy way to see if the CPU is the bottleneck?

  3. “XP relies about equally on both the CPU and GPU.”
    Sorry, but that is plain wrong. XP uses opengl which is largely CPU dependent.
    I went from a 1070 to 1080Ti and noticed no fps gain in XP11 (although the Ti is handy for VRAM with ortho scenery, and higher AA).

    Steve

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