linkHey. I've been going through numerous posts on different Flight sim forums regarding the debate where people using 5800X3D saying it has much better performance in msfs 2020 and xplane. Claims suggest the 96 mb L3 cache on 5800X3D takes advantage over 64 mb L3 cache on 5950X. For me this isn't a significant difference and measuring a cpu's performance based on just L3 cache is not a good enough data point.

Sure the flight sims could be performing better with 5800X3D taking advantage for the additional L3 memory and pushing more frames but to me that sounds like an optimisation issue from the developers of flight sims where the can't fully utilise the potential of a 16 core processor (5950X) v/s 8 core processor (5800X3D).

I'm currently using 5950X paired with EVGA RTX 3090 Ti and after the SU12 msfs 202 update, I'm struggling with frame rate (discussed this in another post).

On xplane 12 as well I go max upto 33 fps, with gpu utilisation staying below 50% most of the time and cpu utilisation hitting around 60ish%

On xplane 11 things are much much better. 45+ fps and during flight hitting around 75fps. Xplane 11 is quite mature now and seems to handle things much better.

This performance difference makes me think that its more of a sim issue rather than hardware.

I checked the bottleneck stats for cpu gpu combo on https://pc-builds.com.

5950X paired with RTX 3090 Ti on 4k res shows a 16.1% bottleneck, while 5800X3D paired with RTX 3090 Ti on 4k is 0.6% bottleneck.

I fail to understand why a high end processor paired with high end gpu will under perform. I don't see issues of thermal throttling on my machine either.

The posts about 5800X3D are intriguing and kind of persuading me to make a purchase and try out 5800X3D. Is it a good idea? Or should I wait for sim devs to fix issues of cpu optimisation in the future releases?

In this video you can see the guy comparing both cpus on msfs 2020. It 11 months old video and on 5950X he's pulling 94 fps with a 3080. Watching this is just making me frustrated since I can't get the same performance out of the sim with a better gpu.

Anyways, I'd like to hear from your experience guys. Please share your thoughts.

While I can't make a comparison between a 5950X and 5800X3D because I've never owned the former, I can provide a comparison data point with a 5800X3D for the scenario you posted in your frame rate post, namely EGLL sitting on the runway in PMDG 737, scattered clouds and a slight haze, FSLTL, 4K Ultra and lots of MP traffic. Without frame generation, I get around 40 FPS with a main thread time of around 25ms. My 4080 shouldn't be a factor as it is only loaded at 70% and MSFS shows I am clearly CPU limited, so the CPU is what is calling the FPS shots.

Re the comparison video you posted, those results are at 1080p, not 4K, so the FPS will be much higher.

Edited April 10, 20233 yr by Reset XPDR

On 4/10/2023 at 11:24 PM, Reset XPDR said:

While I can't make a comparison between a 5950X and 5800X3D because I've never owned the former, I can provide a comparison data point with a 5800X3D for the scenario you posted in your frame rate post, namely EGLL sitting on the runway in PMDG 737, scattered clouds and a slight haze, FSLTL, 4K Ultra and lots of MP traffic. Without frame generation, I get around 40 FPS with a main thread time of around 25ms. My 4080 shouldn't be a factor as it is only loaded at 70% and MSFS shows I am clearly CPU limited, so the CPU is what is calling the FPS shots.

Re the comparison video you posted, those results are at 1080p, not 4K, so the FPS will be much higher.

Glad to have read this.  I'm about to upgrade from an i7 9700 to the same AMD chip.  But I have a 3080Ti GPU.   Sounds promising,