This one hands the win quite handsomely to the 5800X3D by a margin of about 20%+.

In any case, I expect that from the OP's perspective the performance of the 12900K in MSFS should be moot as a 12900K, especially if paired with DDR5, in not a budget solution. The 5800X3D is a cracker of a budget CPU for MSFS and will easily met their stated requirements.

On 9/7/2022 at 12:02 AM, Reset XPDR said:

As you say, it is hard to find MSFS benchmarks of this combo, but I found one site that had them for the https://www.gpucheck.com/game-gpu/microsoft-flight-simulator/amd-radeon-rx-6900-xt/amd-ryzen-7-5800x/ultra and https://www.gpucheck.com/game-gpu/microsoft-flight-simulator/amd-radeon-rx-6800-xt/amd-ryzen-7-5800x3d/ultra. While it doesn't show 1% low performance, they do show average performance at w1440p Ultra settings in MSFS to be just over 55 FPS for the both of them.

Given this stated performance target, either option you present (5800X/6900XT or 5800X3D/6800XT) should achieve it through sheer average FPS being nearly double what your stated 1% low performance floor is and the fact that charts like below (albeit at 1080p) show 1% low performance with either CPU is no worse than 80% of average FPS. That is, if average FPS is 55 then 1% low should be no worse than 44 FPS, which is well above your stated floor.

TL;DR - either option should do the job.

This makes me confused. According to this a 5800X3D is stronger than a 12900KS. Then how can this benchmark be explained ?
https://cpu.userbenchmark.com/Compare/Intel-Core-i5-12600K-vs-AMD-Ryzen-7-5800X3D/4120vsm1817839
here 12600K seem clearly stronger than 5800X3D

1 hour ago, jfri said:

This makes me confused. According to this a 5800X3D is stronger than a 12900KS. Then how can this benchmark be explained ?
https://cpu.userbenchmark.com/Compare/Intel-Core-i5-12600K-vs-AMD-Ryzen-7-5800X3D/4120vsm1817839
here 12600K seem clearly stronger than 5800X3D

Because that is a synthetic benchmark. Find actual MSFS benchmarks, like the ones posted later in this thread, to show the relevance to using these processors in MSFS. Here's another two showing how the 5800X3D holds its own against the 12900K(S) in MSFS: https://www.youtube.com/watch?v=EOL2sDXK64A&t=208s, https://www.youtube.com/watch?v=ozM92v4KhIk&t=247s

18 minutes ago, Reset XPDR said:

Because that is a synthetic benchmark. Find actual MSFS benchmarks, like the ones posted later in this thread, to show the relevance to using these processors in MSFS. Here's another two showing how the 5800X3D holds its own against the 12900K(S) in MSFS: https://www.youtube.com/watch?v=EOL2sDXK64A&t=208s, https://www.youtube.com/watch?v=ozM92v4KhIk&t=247s

I am aware of MSFS (and other flightsims also I think) is different from ordinary games. But I am surprised of such big differences in those benchmarks

AMD Ryzen 9 7900X CPU-Z Benchmarks show its behind Core i7-12700K in ST (guru3d.com)

i shall build a new sim PC , seems to  go back to INTEL Raptor Lake 13900 from AMD suspekt that intel gone be faster in the sim. get info not from the internet leaks but from ?

 

Edited September 20, 20223 yr by westman