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Kymedic0215

Limited by Main Thread on New High-Spec Build

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4 hours ago, MySound said:

Well. For almost every game there is a main thread. You use threads to distribute work. However, one thread is holding it all together. You can’t distribute one thread to multiple cores. And though the 13xxx and 7xxx CPU are strong overall, the single core performance did not grow as much over the last years. 
And, together with the Terrain LOD set to high leads to main thread limitation. 
 

And I am 98% sure that’s the case here too. 

This.. this isn’t really true at all. Single core performance has substantially improved over the years and with the advent of 3D cache on a single CCD die we’re seeing really good single core performance. 
 

You’ll always be main thread limited with a setup like this because there’s no CPU that can keep up with the bandwidth of a 4090/7900XT. However that doesn’t mean it’s a bad thing given the context.

Edited by Lucky38i
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5 hours ago, Ianrivaldosmith said:

May I ask, why? 4 series gives you FG. 

At least £300 more for similar raster performance and less VRAM. FG has its downfalls

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9 minutes ago, Lucky38i said:

At least £300 more for similar raster performance and less VRAM. FG has its downfalls

Everything has its downfalls, nothing is perfect. But FG helps SO much in simming. I’ve been simming since the mid 90’s and in my opinion it’s one of the greatest things to ever happen to flightsims. £300 is way worth the extra (if you have it) for FG alone. 
 

Ps less Vram? The 4090 has more vram than the 7900XT. 

Edited by Ianrivaldosmith
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7 hours ago, Ianrivaldosmith said:

Everything has its downfalls, nothing is perfect. But FG helps SO much in simming. I’ve been simming since the mid 90’s and in my opinion it’s one of the greatest things to ever happen to flightsims. £300 is way worth the extra (if you have it) for FG alone. 
 

Ps less Vram? The 4090 has more vram than the 7900XT. 

7900XT is comparable to the 4080, if we’re talking 4090 it’s at least another £500, this is in the UK, I understand it can vary for others. Though it’s a hell of a card if you got the money

Yeah I fully agree FG is amazing for fps alone, but personally I’m not a fan of AI upscalers.

I apologise, as despite my opinion it’s not a valid reason not to recommend FG cards since it’s has its usefulness FG supported titled.

anyway let’s see what OP has to say so we can make sure they’re getting better perf

Edited by Lucky38i

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6 hours ago, Lucky38i said:

anyway let’s see what OP has to say

I'm afraid the OP was a drive-by poster. 🙄

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On 7/17/2023 at 3:59 AM, cianpars said:

As it's a new build, I would assume mobo, chipset and nvidia drivers are all up to date

This was my thought, but that chipset drivers may not be up to date or installed at all.  


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make sure the MSFS threads are running on core 0-15 which are the vcache cores, this isnt just about single thread performance. you will literally get a 25% increase on those cores in the in game FPS ms timing. On my system I need to park manually in process lasso as windows did not send the threads to the vache cores!  some people are lucky and it did it automatically. my 2 cents. 


7900x3d , 64gb 6200mhz 30CL Ram, RTX 3080

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23 hours ago, Lucky38i said:

This.. this isn’t really true at all. Single core performance has substantially improved over the years and with the advent of 3D cache on a single CCD die we’re seeing really good single core performance. 
 

You’ll always be main thread limited with a setup like this because there’s no CPU that can keep up with the bandwidth of a 4090/7900XT. However that doesn’t mean it’s a bad thing given the context.

What exactly isn’t true?

Low FPS on a highend system, limited by main thread. So yeah. Guess what. The single core performance is too low. And compared to overall CPU performance (by adding more cores) single core performance did not scale quite as much. 
 

And the game engine sucks when it comes to displaying objects in the distance. 

Edited by MySound

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yes it does but if you have from previous versions you would think differently maybe !

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I recently upgrade from 2080Ti to 4070Ti, but the performance in DX11 was exactly the same because my I9 10900k was the bottleneck in my system causing me limited by main tread.
But framegeneraton gave me double fps and smoother performance, I hope multicore in MSFS 2024 will cause my CPU to work optimally, otherwise I will have to upgrade it.

Edited by Ixoye

System: I ASRock X670E | AMD 7800X3D | 32Gb DDR5 6000 | RTX 4090 | 2TB NVMe | LG Ultra Gear 34* UW |

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13 hours ago, MySound said:

Low FPS on a highend system, limited by main thread. So yeah. Guess what. The single core performance is too low.

Like I already said. There is no consumer CPU out there that can equate to the a 7900XT/X or Nvidia equivelant. You will always be main thread limited, this does not equate to low single core performance.

13 hours ago, MySound said:

(by adding more cores)

what? No, adding more cores to a CPU doesn't suddenly mean better overall performance. There's cache, threads, base frequency, voltages etc are all involved that effect the overral performance of a CPU.

13 hours ago, MySound said:

single core performance did not scale quite as much. 

Yes, it has. You can check any graph across generations and see single core performance has increased over generations, especially Intel. You can't directly tie core number to single core performance as some kind of scale to performance.

13 hours ago, MySound said:

And the game engine sucks when it comes to displaying objects in the distance. 

No it doesn't? This is tied to your TLOD scale.

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At lower resolution with a 7950X3D and still getting around 20 fps... something is not right... A better combo would have been a 7950X3D with a 4080...

In the screenshots I'm thread limited using ultra settings, map enhancement (Bing maps latest) and 100% AIG traffic (all corporate and airlines) @ JFK with my FPS around 40... FG is doing it's job...  🙂

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Edited by Dexter1979

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On 7/18/2023 at 10:09 AM, odourboy said:

I'm afraid the OP was a drive-by poster. 🙄

This. Odd.


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On 7/17/2023 at 7:44 AM, Sethos said:

First off, seeing as you're on the 7950X3D, you also need to manage the cores to only let MSFS use the cores with the 3D cache on them. Only on the 7800X3D can you just use it as is.

Secondly, what constitutes "Ultra" settings here, what's your terrain level of detail etc. We just had a thread where someone had similar complaint that went on for a long time. Turned out he just cranked terrain level of detail past 200, which is extremely demanding, in built up areas and with AI and that's when you start to take a hit.

Even with a high-end machine, you cannot max out every slider, not even with frame-generation, which you don't even have access to.

How would I tell MSFS to only use specific cores?

 

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