How much RAM does a flight simulator need? Compare 16, 32 and 64 GB for MSFS 2024, X-Plane, DCS, FSX, VR and add-ons.
For flight simulators in general, 16 GB of system RAM is the workable minimum for a modern title, while 32 GB is the best target for most simmers. Choose 64 GB for Microsoft Flight Simulator 2024 with demanding add-ons, VR or heavy background applications. Older simulators need much less.
How much RAM does each PC flight simulator need?
Most modern flight simulators run comfortably with 32 GB, but their practical minimums differ considerably.
| Simulator | Workable RAM | Best target | When 64 GB helps |
|---|---|---|---|
| Microsoft Flight Simulator 2024 | 16 GB | 32 GB | Heavy add-ons, VR, busy traffic and extensive multitasking |
| Microsoft Flight Simulator 2020 | 16 GB | 32 GB | Unusually demanding add-on combinations or background tools |
| X-Plane 12 | 16 GB | 32 GB | Large custom scenery, detailed aircraft and numerous plugins |
| DCS World | 16 GB for lighter missions | 32 GB | Large multiplayer missions, complex maps and mission editing |
| Prepar3D v4 and later | 16 GB | 32 GB | Extensive scenery, aircraft and utility combinations |
| FlightGear | 8 GB for lighter use | 16 GB | Rarely necessary solely for the simulator |
| FSX and FS2004 | 8 GB in a modern PC | 8–16 GB | No normal simulator benefit |
These are practical amounts of total system memory, not guarantees of a particular frame rate. Microsoft Flight Simulator 2024 officially scales from a 16 GB minimum tier through 32 GB recommended and 64 GB ideal configurations. Our comparison of MSFS 2020 and 2024 hardware tiers covers the accompanying CPU and graphics requirements.
FSX and FS2004 are different because they are legacy 32-bit applications. Installing 32 or 64 GB does not remove the simulator process's address-space limit, although spare system memory still helps Windows and supporting programs. See our practical explanation of FSX hardware limits before upgrading a PC specifically for that simulator.
Will more RAM improve flight simulator FPS?
Extra RAM improves smoothness only when the simulator and other applications are exhausting the memory already installed.
Moving from 16 to 32 GB can reduce pauses, disk swapping and crashes on an add-on-heavy system. Moving from 32 to 64 GB usually produces little or no average FPS increase if memory usage was already below the limit. In that situation, the CPU or GPU is more likely to be holding performance back; our guide to distinguishing RAM, CPU, GPU and VRAM bottlenecks explains the different symptoms.
System RAM and graphics VRAM are not interchangeable. When a graphics card runs short of VRAM, Windows may borrow system memory, but the transfer is much slower. Adding system RAM can prevent a crash caused by total memory pressure, yet it cannot turn an 8 GB graphics card into a 16 GB one.
Memory speed and dual-channel operation can affect a CPU-limited simulator, but capacity comes first. A fast 16 GB kit that is constantly full is worse than a stable 32 GB kit running at a modest speed.
How can you tell if the simulator is running out of RAM?
Sustained memory use near the system limit, rising committed memory and simultaneous disk activity are the clearest signs that RAM capacity is restricting the simulator.
- Reproduce a demanding flight. Load the aircraft, airport, traffic, weather and supporting applications you normally use rather than testing at an empty default airfield.
- Watch total and committed memory. In Windows, open Task Manager and examine the Memory section while the simulator is running. On macOS, check Memory Pressure in Activity Monitor.
- Look for matching symptoms. Long pauses, severe stutters when changing views, texture-loading delays, low-memory warnings and crashes become significant when they coincide with memory exhaustion.
- Close background applications and repeat the flight. A clear improvement indicates that total memory pressure was part of the problem.
- Keep a Windows page file enabled. A system-managed page file on an SSD is slower than RAM but can prevent an abrupt crash. Disabling it to force the simulator to use physical RAM is a common mistake.
- Test add-ons in batches. Memory use that keeps climbing can come from an aircraft, scenery package or utility rather than insufficient hardware alone.
High usage by itself is not proof of a fault because operating systems use spare RAM as a reclaimable cache. If MSFS 2024 displays a warning, follow our steps for resolving its low-memory condition before assuming another RAM kit is the only fix.
Should you buy 32 GB or 64 GB for flight simulation?
Buy 32 GB for a typical new flight-simulation PC; choose 64 GB when you already know your aircraft, scenery, VR setup or background workload regularly needs the extra headroom.
- Choose 16 GB for an upgradeable budget PC, lighter simulators or mostly default content. Expect to close browsers and other memory-heavy applications before flying modern titles.
- Choose 32 GB for MSFS 2020, MSFS 2024, X-Plane 12, DCS World or modern Prepar3D use with sensible add-on collections. This is the balanced capacity for most simmers.
- Choose 64 GB for MSFS 2024's ideal hardware tier, large DCS missions, extensive X-Plane scenery, VR alongside demanding add-ons, streaming or content-creation software running during a flight.
Use a matched memory kit supported by the motherboard, preferably with two modules so the system can operate across its available memory channels. Check the PC or laptop's maximum capacity and required DDR generation before buying; different DDR generations are not interchangeable. Avoid mixing unrelated kits where possible, even when their advertised speed and capacity appear identical.
Laptop memory may be partly or completely soldered, so 32 GB is the safer purchase when later upgrades are impossible. Apple silicon Macs use unified memory shared by the CPU and graphics system, making 24 or 32 GB preferable for demanding X-Plane use. Xbox and PlayStation consoles have fixed memory managed by the platform, so there is no RAM configuration for the user to choose.