Should I overclock my PC for flight simulators?

Overclocking can increase flight-simulator FPS, but only when the CPU, GPU or memory being tuned is the measured bottleneck. Gains are usually modest, while heat, power draw and instability rise. For most simmers, stock automatic boost, sensible settings and a tested undervolt provide a better balance than an aggressive manual overclock.

This is general desktop-PC advice for Microsoft Flight Simulator, X-Plane, Prepar3D, FSX and other simulators. Microsoft Flight Simulator 2024 also runs on Xbox Series X|S, PlayStation 5 and PS5 Pro, but consoles do not expose the clock and voltage controls discussed here.

When does overclocking improve flight simulator FPS?

Overclocking improves FPS only when additional clock speed shortens the frame time of the component limiting the simulator.

Modern CPUs and GPUs already vary their clocks according to workload, temperature and power headroom. A fixed all-core CPU overclock can be slower in a simulator if it replaces a higher automatic single-core boost, while a GPU overclock can achieve nothing when the main thread is holding back the graphics card.

Use our practical CPU-versus-GPU bottleneck checks if the limiting component is unclear. A mistake we see constantly is treating low total CPU utilisation as proof that the CPU has spare capacity; one saturated simulator thread can limit FPS while the other cores remain lightly loaded.

How do I find the bottleneck before overclocking?

Benchmark a repeatable flight at stock settings before changing clocks, voltage, power limits or memory profiles.

1. Establish a stock baseline. Use the same aircraft, airport, weather, traffic, camera view and graphics settings. Record native FPS, frame time, temperature, power and sustained clock speed.
2. Remove artificial limits. Temporarily disable VSync and frame caps while diagnosing. Disable frame generation as well, because generated FPS can obscure the native CPU and GPU frame times.
3. Read the simulator’s frame-time display. Compare main-thread and GPU frame times where the simulator exposes them. Frame time is more useful than average utilisation.
4. Run a resolution test. Reduce resolution or render scale substantially. A clear FPS gain indicates a GPU limit; little or no change points towards the CPU, a cap or a non-rendering constraint.
5. Reduce the relevant settings first. Traffic, terrain detail, object detail and glass-cockpit refresh can reduce main-thread load. Resolution, clouds, shadows, reflections and anti-aliasing primarily affect the GPU.
6. Check memory capacity and add-ons. Overclocking cannot compensate for exhausted RAM or VRAM, an incompatible aircraft, excessive scenery packages or interrupted scenery streaming.

Does overclocking the GPU increase FPS?

Yes, overclocking a GPU can increase FPS when the simulator is GPU-limited, but the improvement is usually a few per cent rather than a new performance tier.

A core overclock helps shader and rendering throughput. A VRAM overclock helps only when memory bandwidth is restricting the GPU, and increasing the power limit merely gives the card permission to consume more power—it does not guarantee a higher sustained clock.

Watch for flashing pixels, coloured speckles, checkerboard patterns, corrupted textures, black screens, driver resets and falling performance. Some graphics memory corrects or retries errors without an obvious visual artefact, so an excessive memory overclock can benchmark slower despite reporting a higher clock.

Our GPU-limited flight-simulator tuning advice covers the expected trade-offs and safer alternatives in more detail.

Does overclocking memory clock increase FPS?

Increasing memory clock can raise FPS, but GPU VRAM and system RAM affect different bottlenecks.

• GPU memory clock: helps when the graphics card is bandwidth-limited by high resolution, anti-aliasing, large render targets or other heavy rendering work. It may do almost nothing in a CPU-limited flight.
• System RAM speed: can improve CPU-limited frame times and minimum FPS when the processor is sensitive to memory latency or bandwidth. It cannot replace insufficient RAM capacity.

Benchmark core and memory changes separately. If both are raised at once, there is no reliable way to identify which change improved performance or caused an error.

What is a normal VRAM clock speed?

There is no universal normal VRAM clock speed; the correct value depends on the GPU model, board design, memory type, power state and monitoring tool.

Monitoring software may show the physical memory clock while the card specification uses an effective data rate. For example, a tool might report about 1,750 MHz for GDDR6 sold as 14,000 Mb/s; those figures can describe the same memory rather than an eightfold fault. GDDR6X and different utilities may use other reporting conventions, so compare like with like instead of multiplying every reading by a fixed number.

VRAM normally downclocks at idle and rises under a 3D load. Multiple displays, high refresh rates and video playback can keep it in a higher power state. Compare the sustained load reading with the stock specification for the exact graphics card, not with an unrelated GPU or an advertised effective rate carrying different units.

Is CPU overclocking worth it for a flight simulator?

A CPU overclock is worthwhile only when the simulator is main-thread limited and the tune improves sustained lightly threaded performance without causing thermal throttling.

Do not assume the highest all-core multiplier is the fastest setting. Flight simulators distribute work across several threads, but one critical thread often determines when the next frame can be submitted. Preserving strong automatic boost behaviour may therefore beat a fixed all-core overclock.

For processor-specific decision criteria, see our explanation of when CPU overclocking helps a flight-simulator main-thread limit.

Does automatic tuning increase FPS?

Automatic tuning can increase FPS when it produces higher stable clocks on the component limiting performance, but it cannot bypass a CPU limit, frame cap, VRAM shortage or streaming problem.

• Automatic GPU tuning commonly scans a voltage-frequency curve and applies a conservative core tune. Many implementations do not tune VRAM, so check what the control actually changes.
• CPU automatic boost or curve tuning may improve lightly threaded clocks if cooling and power headroom exist. The processor’s standard boost logic may already be using most of that headroom.
• Motherboard automatic overclocking can apply more voltage and power than necessary. Automatic does not mean cool, efficient or guaranteed stable.

Test automatic tuning against a genuine stock baseline. If average FPS is unchanged but temperatures or power draw rise, it has not provided a useful result for that flight.

Can you undervolt and overclock at the same time?

Yes, you can undervolt and overclock a CPU or GPU at the same time by targeting a higher frequency at a lower voltage, provided that exact voltage-frequency combination is stable.

This is common with modern GPUs: reducing voltage can lower temperature and power consumption enough to sustain a higher real-world clock. An undervolt without any explicit overclock may also increase actual performance if it prevents the card from reaching a thermal or power limit.

• On a CPU, a negative voltage offset or curve adjustment may be combined with higher boost targets or multipliers.
• On a GPU, the voltage-frequency curve can be adjusted so the card reaches the desired clock at a lower voltage, rather than simply adding a global clock offset.

Do not apply both changes in one jump. Establish stock stability, test the undervolt, then raise frequency in small steps. An aggressive undervolt may fail during light-load transitions or long flights even after passing a short, heavy benchmark.

Should XMP/EXPO High Bandwidth Support be on or off?

Enable a suitable XMP or EXPO memory profile if the motherboard, processor and matched RAM kit support it and remain stable, but leave the separate High Bandwidth Support option off or at its default initially.

XMP and EXPO load stored memory frequency, timing and voltage settings. They are still forms of memory-system overclocking, and the rated profile may be harder to run with four DIMMs, mixed kits, high-capacity configurations or a heavily loaded processor memory controller.

High Bandwidth Support is a vendor-specific firmware preset found on some motherboards; it is not required for XMP or EXPO. Depending on the board and firmware, it may alter secondary timings or memory-controller behaviour. Enable it only as a separate experiment after the basic memory profile has passed testing.

1. Load XMP or EXPO alone. Leave other memory enhancement presets at Auto or Disabled.
2. Allow memory training to finish. The first boot can take longer than usual; repeated boot loops or automatic recovery indicate a problem.
3. Test cold boots and sustained load. Memory instability often appears as simulator crashes, decompression errors, application faults or unexplained restarts rather than a message naming the RAM.
4. Test High Bandwidth Support separately. Keep it only if measured frame times improve and the machine remains stable.

MSFS 2024 VSync on or off?

For Microsoft Flight Simulator 2024 on PC, turn VSync off while benchmarking or tuning. During normal flying, turn it on if a fixed-refresh display tears, or leave it off when variable refresh rate and a separate frame cap already handle synchronisation.

An overclock may still help MSFS 2024 hold a capped target during demanding approaches, but it will not raise the reported average above that cap. Recheck native frame time when using frame generation; generated frames improve visual smoothness without removing the underlying main-thread limit.

How should I overclock safely for flight simulation?

A safe overclock starts with a stable stock system, one small change at a time and simulator-specific validation.

1. Confirm the hardware supports tuning. Locked processors, restricted pre-built firmware and most laptops offer little useful headroom. Laptop overclocking is generally a poor trade because cooling and power limits are tight.
2. Save the stock configuration. Record original firmware and tuning values. Do not tune around existing crashes, thermal throttling, hardware-error reports or random restarts.
3. Change one component at a time. Keep the CPU, GPU and RAM at stock except for the item under test. Never copy another user’s voltage simply because the hardware model matches.
4. Stay within manufacturer limits. Monitor temperature, voltage, clock, power and fan behaviour. There is no single safe voltage or temperature that applies to every generation of CPU, GPU and memory.
5. Run component tests first. Check CPU, GPU and memory stability separately, including load changes rather than only continuous maximum load.
6. Validate in the simulator. Test dense airports, complex glass cockpits, heavy clouds, busy traffic and long flights. Include a full cold boot when changing RAM settings.
7. Compare frame times, not just the peak FPS. Reject a tune that raises a short benchmark score but worsens stutter, minimum FPS, noise or power consumption.
8. Revert at the first sign of instability. Visual artefacts, application crashes, driver timeouts, freezes, hardware-error entries, restarts and shutdowns all require a return to known-good settings.

When should I leave the PC at stock settings?

Leave the system at stock when the simulator is capped, limited by capacity or software, already near thermal limits, or used for flights where reliability matters more than a small benchmark gain.

• Consider a modest tune for an unlocked desktop with a confirmed CPU or GPU bottleneck, adequate cooling and enough time for proper validation.
• Prefer an undervolt when temperature, fan noise or power limits are preventing normal boost clocks.
• Stay at stock on most laptops, unstable systems, thermally constrained pre-built PCs and machines suffering unexplained crashes.
• Change simulator settings instead when traffic, render scale, clouds, terrain detail, VRAM use or a particular add-on is the real constraint.

For flight simulation, the best tune is not the highest clock that completes a short benchmark. It is the configuration that improves repeatable frame times and still completes a long, demanding flight without artefacts, errors or a crash on final approach.