What PC specifications do I need for Prepar3D?
For Prepar3D v5 or v6, we recommend 64-bit Windows 10 or 11, a modern six-core CPU with strong single-core performance, 16 GB of RAM (32 GB for add-ons), a DirectX 12 graphics card with 8 GB of VRAM, and an SSD with at least 100 GB free.
Those are sensible planning specifications rather than the bare minimum needed to launch Prepar3D. The official minimum varies by release, while complex aircraft, detailed airports, AI traffic, weather and high resolutions can require substantially more performance than the default simulator.
Recommended Prepar3D system requirements
A balanced PC is more useful than one expensive component paired with several weak ones.
| Component | Base or moderate use | Heavy add-ons or high resolution |
|---|---|---|
| Operating system | 64-bit Windows supported by the exact Prepar3D release | 64-bit Windows 10 or 11 for v5 and v6 |
| Processor | Six-core CPU with strong single-thread performance | Fast six- to eight-core CPU, especially for complex aircraft and AI traffic |
| Memory | 16 GB RAM | 32 GB RAM |
| Graphics | Dedicated DirectX 12 GPU with 8 GB VRAM for v5 or v6 | 12 GB or more VRAM for demanding scenery, anti-aliasing or 4K |
| Storage | SSD with at least 100 GB free | 250 GB to 1 TB of SSD capacity for a growing scenery library |
Prepar3D often becomes limited by its main rendering thread, so CPU core count alone is a poor buying guide. Compare per-core performance as well; clock speeds cannot be compared directly across unrelated processor generations.
The graphics card matters more as resolution, shadows, reflections, dynamic lighting and anti-aliasing rise. VRAM capacity is not the same as GPU speed, however: a slow card with 12 GB is not automatically better than a faster 8 GB card.
Common hardware-buying mistakes
- Choosing integrated graphics: some recent integrated GPUs may start the simulator, but shared memory and limited sustained performance make them a poor choice for a dedicated Prepar3D computer.
- Assuming laptop and desktop parts are equal: similarly named laptop processors and GPUs often run at lower power. Cooling also affects sustained performance during a long flight.
- Buying for the default simulator: detailed airports, photoreal scenery, complex aircraft and external utilities can change the requirement considerably.
- Confusing RAM with VRAM: adding system memory does not solve graphics-memory exhaustion.
Do Prepar3D versions need different hardware?
Yes. Prepar3D's architecture and graphics API changed significantly between v3, v4 and the later releases.
- Prepar3D v3 and earlier: these are 32-bit applications. Their address-space limit can produce out-of-memory errors even when the computer has plenty of physical RAM.
- Prepar3D v4: this release moved to 64-bit and uses DirectX 11. A capable DX11 graphics card and 16 GB RAM are sensible starting points.
- Prepar3D v5 and v6: these are 64-bit DirectX 12 simulators. A properly supported DX12 GPU, sufficient VRAM and up-to-date graphics drivers become more important.
Hardware cannot make an old 32-bit aircraft module work in a 64-bit simulator. Before moving an older aircraft collection to v4, v5 or v6, see our guide to blank gauges and 64-bit add-on compatibility.
Is 16 GB of RAM enough for Prepar3D?
Sixteen gigabytes is enough for a base or moderately modified Prepar3D installation, but 32 GB is the better target when running detailed aircraft, AI traffic, large airports, weather software and browser-based charts together.
Keep the Windows page file enabled and preferably system-managed. Disabling it does not make Prepar3D faster and can turn high memory use into an application or system failure. For v3 and earlier, adding RAM helps Windows and other programs but does not remove the simulator's 32-bit address-space ceiling.
How much SSD space should I reserve?
Reserve at least 100 GB for Prepar3D itself and installation headroom, then size the drive around the scenery and aircraft you intend to add. A 250 GB allocation is reasonable for moderate use; scenery-heavy installations can consume 500 GB or more.
The aircraft, airports and utilities in our Prepar3D add-on library illustrate why storage grows quickly. As one concrete example, a single 5.96 GB photoreal Hawaii package occupies more space than many aircraft collections.
An SSD reduces loading times and helps Prepar3D retrieve scenery and textures without the delays associated with a mechanical hard drive. NVMe is preferable when capacity and price are similar, but moving from a hard drive to any competent SSD is the more significant improvement.
Which PC upgrade improves Prepar3D most?
The best upgrade depends on the component limiting the flight you actually run.
- Replace a mechanical drive first if Prepar3D, its scenery or the Windows page file still resides on one. This improves loading and asset delivery, though it may not raise steady frame rates.
- Prioritise the CPU when one logical core is heavily loaded while the GPU has spare capacity. Overall CPU usage can look deceptively low because the workload is not spread evenly across every core.
- Prioritise the GPU when graphics utilisation or VRAM use is consistently near its limit, particularly at 1440p or 4K. Resolution, anti-aliasing and shadows are useful settings for confirming this bottleneck.
- Add RAM when total committed memory approaches capacity and Windows begins paging during complex flights. Moving from 16 GB to 32 GB helps in this case; it will not improve a CPU-limited frame rate.
A crash does not automatically mean the PC is underpowered. Faulty scenery, incompatible add-ons, unstable overclocks and excessive settings can all be responsible; our explanation of scenery and memory causes behind Terrain.dll errors covers that diagnosis separately.