Find the best AM4 CPU for MSFS 2020, compare the Ryzen 7 5700X3D and 5800X3D, and check BIOS, bottleneck and upgrade caveats.
For Microsoft Flight Simulator 2020, the Ryzen 7 5700X3D is the best AM4 CPU to buy. Its 3D V-Cache improves CPU-limited frame rates and, crucially, frame-time consistency. The Ryzen 7 5800X3D is the absolute fastest AM4 option, but choose it only when its total cost is close to the 5700X3D.
Why does an X3D CPU suit MSFS 2020?
Ryzen X3D processors suit MSFS 2020 because their large L3 cache helps the main simulation thread access frequently used data without waiting as often for system memory.
The simulator uses several cores, but dense airports, complex glass-cockpit aircraft, AI traffic and high Terrain Level of Detail settings often expose a main-thread ceiling. X3D processors tend to improve the worst dips and frame pacing, not merely the maximum frame rate. Extra cores on a Ryzen 9 5900X or 5950X do not provide the same benefit for MSFS alone.
At high resolutions or render scaling, the graphics card may become the limiting component instead. Our explanation of how Microsoft Flight Simulator shifts between CPU and GPU limits will help identify which part is holding back performance. An X3D processor cannot fix stutters caused by scenery streaming, faulty add-ons or thermal throttling.
Ryzen 7 5700X3D or 5800X3D: which should you buy?
Buy the Ryzen 7 5700X3D unless a trustworthy 5800X3D is available for only a modest premium.
| AM4 processor | MSFS 2020 verdict | When to choose it |
|---|---|---|
| Ryzen 7 5700X3D | Best overall AM4 purchase | You want the strongest sensible drop-in upgrade for an existing AM4 system. |
| Ryzen 7 5800X3D | Fastest AM4 option | Its price is close to the 5700X3D and the chip has a sound warranty or verifiable condition. |
| Ryzen 5 5600X3D | Capable but niche | You already own one or find it substantially cheaper. Replacing it solely for MSFS is rarely worthwhile. |
| Ryzen 9 5900X or 5950X | Better for heavily threaded work than for maximum MSFS performance | Rendering, encoding or other core-heavy workloads matter more than simulator frame rates. |
The 5800X3D has higher operating clocks and can edge ahead, but replacing a 5700X3D with one solely for MSFS 2020 is poor value. Conversely, do not select a non-X3D Ryzen 9 simply because its model number and core count are higher.
Is an AM4 X3D upgrade worth it for your system?
An AM4 X3D upgrade is worthwhile only when MSFS is CPU-limited in the flights you actually run.
Enable Developer Mode and use its Display FPS overlay during a representative flight. If it reports Limited by MainThread and lowering resolution produces little improvement, the processor is the likely constraint. If it reports a GPU limitation, changing the CPU may improve minimums but will not transform the average frame rate.
- Ryzen 1000, 2000 or 3000: the 5700X3D can be a substantial final-platform upgrade if the motherboard supports it.
- Non-X3D Ryzen 5000: upgrading can make sense when large airports, traffic and high Terrain Level of Detail settings cause main-thread dips.
- Ryzen 5 5600X3D: keep it unless non-simulator workloads require more cores.
- Ryzen 7 5700X3D or 5800X3D: keep the processor and tune settings or investigate the GPU, memory and add-ons.
- Ryzen 9 5900X or 5950X: an X3D chip may improve MSFS performance, but heavily threaded productivity performance can fall.
Before buying hardware, try the CPU-heavy adjustments in our main-thread troubleshooting checklist. Reducing AI traffic, airport ground vehicles or Terrain Level of Detail may provide an acceptable result without replacing anything.
What must you check before installing a 5700X3D?
You must confirm motherboard firmware support before fitting any Ryzen 5000 X3D processor; sharing the AM4 socket does not guarantee compatibility.
- Check the exact motherboard: confirm its model, hardware revision and CPU support list. Similar-looking board revisions can require different BIOS releases.
- Update the BIOS first: perform the required update while the old processor is still installed. Some older boards require an intermediate or bridge BIOS, so follow the manufacturer's sequence rather than guessing.
- Save the encryption recovery key: a processor or firmware change can trigger a BitLocker or device-encryption recovery prompt. Do not clear fTPM blindly.
- Inspect cooling and installation: use a suitable AM4 cooler, apply fresh thermal paste and avoid disturbing the RAM or CPU power connection while working.
- Boot at stock settings: allow the first memory-training cycle to finish. Re-enable XMP or DOCP and custom fan settings only after the system starts reliably at defaults.
- Verify the result: update the AMD chipset driver, monitor temperatures and repeat the same aircraft, airport, weather and traffic scenario used before the upgrade.
If the computer powers on without displaying an image, the usual causes are unsupported BIOS firmware, disturbed RAM, an unplugged CPU power lead or poor CPU seating. Let one normal memory-training cycle complete before powering off, then reseat components or clear CMOS according to the motherboard manual.
Should you upgrade AM4 or move to a newer platform?
If you already own a sound AM4 motherboard and DDR4 memory, the 5700X3D is an excellent final upgrade for MSFS 2020. It avoids replacing the board and memory while delivering most of the performance available from the socket.
If you also need to buy a motherboard and memory, building around AM4 makes less sense unless the complete package is exceptionally inexpensive. A newer platform offers a better future CPU path; compare our broader MSFS CPU and GPU recommendations before committing to an entirely new system.