I’ve seen much advice in this topic and others to use RTSS to cap frame rates in MSFS, as this presumably affords greater consistency and smoothness.  I’ve used the NVCP max frame rate setting, as well as the half refresh rate Vsync setting in MSFS, with the goal of attaining a stutter free 30 fps on my 4K LG 60 Hz monitor. 
Today, I tried the recommended RTSS approach. Set Vsync off in MSFS, Vsync on in NVCP, set the frame limit at 30 in RTSS, and then enabled the frame limiter in the setup menu and set it to front edge sync.  Oddly, the on screen display in RTSS shows frames locked at 15, not 30. When I change the frame limiter setting to async, I get 30 fps, but with front edge sync, only 15. Can someone suggest what is going on here?

I am running MSFS on a system with an RTX 3080 GPU, and a Ryzen 5700 CPU. 

Thanks!

23 minutes ago, rlashier said:

I’ve seen much advice in this topic and others to use RTSS to cap frame rates in MSFS, as this presumably affords greater consistency and smoothness.  I’ve used the NVCP max frame rate setting, as well as the half refresh rate Vsync setting in MSFS, with the goal of attaining a stutter free 30 fps on my 4K LG 60 Hz monitor. 
Today, I tried the recommended RTSS approach. Set Vsync off in MSFS, Vsync on in NVCP, set the frame limit at 30 in RTSS, and then enabled the frame limiter in the setup menu and set it to front edge sync.  Oddly, the on screen display in RTSS shows frames locked at 15, not 30. When I change the frame limiter setting to async, I get 30 fps, but with front edge sync, only 15. Can someone suggest what is going on here?

I am running MSFS on a system with an RTX 3080 GPU, and a Ryzen 5700 CPU. 

Thanks!

You should not use V-Sync in NVCP if you use RTSS to Sync the game I think, they may counteract each other.

6 hours ago, Mace said:

What is "DLDSR" and where is this set?

Deep learning dynamic super resolution. Lol, Nvidia got some fancy words going. It's an AI tech utilizing RTX tensor cores to upscale resolution to higher than native, then downsampling to fit the monitor. 

 

5 hours ago, captainbluesky said:

Thank you all for your very helpful and informative feedback regarding this topic. I have certainly learnt a lot from this forum thread.

Lol, we managed to discuss your OP for 77 posts and 6 pages 😄 I always learn so much from these super-nerdy techy threads, so for me it's been very useful 

4 hours ago, Ixoye said:

I tried something new today, my monitor has three factory settings for refresh rate, 60 -100 and 144hz, so I first tried turn the refresh rate down from 144hz to 100hz and saw that my GPU load was 20% lower with the same performance as before, and at a couple degrees cooler as well which was very promising, so I will keep my monitor at 100hz and put the 20% gain on more Rendering Scale instead.

I think that's a wise decision. All this talk about fps and I don't really see much benefit over 60-80. I'm locked at 80, and I've used the extra headroom on the 4090 to supersample my resolution + increase shadow size in usercfg.opt to 6144. 

2 hours ago, rlashier said:

Today, I tried the recommended RTSS approach. Set Vsync off in MSFS, Vsync on in NVCP, set the frame limit at 30 in RTSS, and then enabled the frame limiter in the setup menu and set it to front edge sync.  Oddly, the on screen display in RTSS shows frames locked at 15, not 30. When I change the frame limiter setting to async, I get 30 fps, but with front edge sync, only 15. Can someone suggest what is going on here?

I am running MSFS on a system with an RTX 3080 GPU, and a Ryzen 5700 CPU. 

That's strange, I get the same locked FPS whether I use async or edge sync. Perhaps @Noel knows more, he's the RTSS expert around here. 

1 hour ago, Ixoye said:

You should not use V-Sync in NVCP if you use RTSS to Sync the game I think, they may counteract each other.

No, they co-exist without any issues. In fact, if using G-sync, V-sync on in NCP is necessary for G-sync to work properly. 

Edited March 7, 20242 yr by Cpt_Piett

4 hours ago, RJC68 said:

I run my TV @100Hz for the exact same reason you mentioned, if I keep fps unlocked and with a 120Hz refresh rate my GPU will be pegged at 100% pretty much all the time which is completely unnecessary

Try locking the fps to 80 using RTSS + front edge sync, the smoothness is still stellar and there will even more GPU headroom. I am running this way with my render scale at 110 and it is a superb experience.

I have achieved FlightSim Nirvana now, 97fps, Ultra, render scale at 130 and everything is smooth as butter 😀

Edited March 7, 20242 yr by Ixoye

2 hours ago, Cpt_Piett said:

No, they co-exist without any issues. In fact, if using G-sync, V-sync on in NCP is necessary for G-sync to work properly. 

What does RTSS Edge Sync brings to the table then? I have never understand that.

Just now, Ixoye said:

What does RTSS Edge Sync brings to the table then? I have never understand that.

Noel found that using edge sync as supposed to async is a recipe for smoothness. We've investigated and found that frame times are much more consistent using edge sync. 

Just now, Cpt_Piett said:

Noel found that using edge sync as supposed to async is a recipe for smoothness. We've investigated and found that frame times are much more consistent using edge sync. 

OK! I have not used V-sync when I tested RTSS edge sync, that is perhaps why it did not work optimally for me.

10 hours ago, Cpt_Piett said:

Actually, I'm testing 4K TAA with 160 render scaling right now. I honestly think DLSS upscaled to "5K" looks better. AND - performance is much worse using TAA - around 60 fps vs 80+ fps using DLDSR+DLSS. I'll post some average values comparing the two in a moment. 

I wrote a little guide on it. Have a look and just PM me if you have any questions! Also you might find my settings interesting.

Thanks for the review!  I'm not getting the hit on the GPU like you are so I'll probably just stick with RS 160 since it's simple and really does enhance image quality.

2 hours ago, Ixoye said:

I have achieved FlightSim Nirvana now, 97fps, Ultra, render scale at 130 and everything is smooth as butter 😀

If you have RTSS installed take a look at the FTV graph at 97 fps then lock to 80 fps and take another look at the FTV. I thought 97 fps was good but 80fps has a more consistent FTV which = warm butter 🙂

5 minutes ago, RJC68 said:

If you have RTSS installed take a look at the FTV graph at 97 fps then lock to 80 fps and take another look at the FTV. I thought 97 fps was good but 80fps has a more consistent FTV which = warm butter 🙂

So I should have G-Sync on + V-Sync in NVCP and use RTSS to lock at 80 with Edge Sync, anything else, how about Low Latency at Ultra in NVCP like I have now?

33 minutes ago, Ixoye said:

So I should have G-Sync on + V-Sync in NVCP and use RTSS to lock at 80 with Edge Sync, anything else, how about Low Latency at Ultra in NVCP like I have now?

Correct.  And throw in ultra low latency as well for good measure. I've seen the latter recommended when using G-Sync. 

I tested DLSS and bumped DSR up to 5120 x 2880 and lost about 10 fps. 

The blurrines of DLSS was 99% gone but just wondering if it was worth the frame loss. 

26 minutes ago, verbal said:

I tested DLSS and bumped DSR up to 5120 x 2880 and lost about 10 fps. 

The blurrines of DLSS was 99% gone but just wondering if it was worth the frame loss. 

I’ve experienced the opposite. 4KTAA RS 160 at 60 fps vs DLDSR 5120 x 2880 at 80+ fps. Are you running “legacy” DSR or DLDSR?

Edited March 7, 20242 yr by Cpt_Piett

4 hours ago, Cpt_Piett said:

Correct.  And throw in ultra low latency as well for good measure. I've seen the latter recommended when using G-Sync. 

What exactly is the ultra low latency for? I have basically your settings except that, I forget where I've seen it but a lot of different sources say to keep it off. Not sure what to do lol

I tried on my side different configurations, in the end I have the 4K native for the monitor, Vsync ON in Nvidia Control Panel (OFF in sim), DLSS on Ultra Quality, Frame Gen ON and also the Auto FPS tool with its default values. Usually the fps is around 60, some times drop to 40. The only problem with these is that on my second monitor the 4K YT videos are not working anymore... I do not know how to balance it..  With TAA only I had less smoothness but also no issue 😄I suppose is a VRAM topic.. GPU load is at 80% usually...