The RTX 4090 is the most powerful consumer GPU on the market—but “most powerful” doesn’t mean “press Max and walk away.” At 4K, the wrong settings still cost you 30–40% of your potential frame rate, and enabling path tracing without DLSS can turn 120 FPS into 16. This guide covers the specific settings that matter, the real performance numbers, and how to configure your system and NVIDIA driver stack to get the most from Ada Lovelace’s flagship. Not sure what terms like render scale or ambient occlusion mean? Our PC graphics settings explained guide breaks them all down.
Quick Start — Five Changes to Make Right Now
- Enable Resizable BAR in BIOS (AMD calls it Smart Access Memory). Lets the CPU access the full 24 GB VRAM frame buffer directly, reducing micro-stutter in open-world and texture-heavy games.
- Set Power Management Mode to Prefer Maximum Performance in NVIDIA Control Panel → Manage 3D Settings. A 450W GPU with inconsistent power delivery produces clock frequency dips mid-frame. This prevents them.
- Enable DLSS and Frame Generation in any supported single-player game. On an RTX 40-series card, Frame Gen synthesises one additional frame between each rendered frame—most effective above 60 FPS base rate.
- Set Low Latency Mode to Ultra in NVIDIA Control Panel for competitive games, or enable NVIDIA Reflex in-game (Reflex supersedes Low Latency Mode when both are active and has no downsides).
- Disable global V-Sync in NVIDIA Control Panel and use an in-game frame cap instead. Global V-Sync forces triple buffering and adds input latency; a per-game limiter achieves the same tearing prevention at lower cost.
RTX 4090 at 4K — The Real Performance Numbers
The RTX 4090 runs NVIDIA’s Ada Lovelace architecture with 16,384 CUDA cores, 24 GB of GDDR6X VRAM on a 384-bit bus delivering around 1 TB/s of memory bandwidth, third-generation RT cores, and a 450W TDP [1]. In traditional rasterized games with no ray tracing, it averages approximately 116 FPS at 4K max settings across a broad game library—genuinely above 100 FPS in most titles without any upscaling required.
That picture changes sharply the moment ray tracing enters the equation. Alan Wake 2 at 4K with all ray tracing maxed drops to 32.8 FPS native. Enable DLSS 3.5 with Frame Generation and it recovers to over 130 FPS [5]. Cyberpunk 2077’s Path Tracing “Overdrive” mode—the most demanding publicly available RT workload—runs at 16 FPS native at 4K on a 4090. With DLSS 3 Quality and Frame Generation, that becomes 103.5 FPS [4]. STALKER 2 without DLSS at 4K: 52 FPS. With DLSS 3: 123 FPS [6].
These aren’t edge cases—they’re the defining pattern. In rasterization, the 4090 dominates at 4K. In modern path tracing, DLSS is what makes it playable. Understanding exactly which DLSS features you have on RTX 40 hardware is therefore the most important thing to get right before you start configuring anything else.
NVIDIA App and Control Panel — Global Settings
These settings apply to every game until you override them per-profile. Configure them once [7].
| Setting | Recommended Value | Why |
|---|---|---|
| Power Management Mode | Prefer Maximum Performance | Prevents clock dips during GPU-light frame phases; essential for voltage stability at 450W TDP |
| Low Latency Mode | Ultra (competitive) / On (single-player) | Ultra reduces pre-render queue to near-zero; On is enough when Reflex is active in-game |
| Anisotropic Filtering | 16x | Near-zero FPS cost; significant texture clarity improvement at oblique camera angles |
| Texture Filtering – Quality | High Quality | Improves filtering precision; no measurable cost at 4K on this hardware |
| Vertical Sync | Off | Use in-game frame limiter; global V-Sync adds input latency via triple buffering |
| Shader Cache Size | 10 GB | Prevents first-run shader stutter in DX12 and Vulkan titles; the default 1 GB is undersized for modern shaders |
| CUDA – GPUs | All | Ensures CUDA tasks route to the 4090, not an iGPU on hybrid systems |
Also in the NVIDIA App: confirm Hardware-Accelerated GPU Scheduling (HAGS) is enabled (Windows Settings → Display → Graphics → Change Default Graphics Settings). HAGS reduces CPU overhead in GPU memory scheduling and is a hard requirement for DLSS Frame Generation to function.
DLSS 4 on RTX 40 Series — What You Actually Have
There is a widespread misconception worth clearing up directly: RTX 40 series does not support Multi Frame Generation. The 3x and 4x frame multiplier announced with DLSS 4 is exclusive to RTX 50 series hardware. What RTX 40 series does support is still substantial:
- Frame Generation (1x) — generates one AI-synthesised frame between each rendered frame, approximately doubling output frame rate. Available in 250+ supported games [3].
- DLSS 4 Transformer Super Resolution — the transformer-based AI upscaling model introduced with DLSS 4, significantly sharper than the previous CNN model. Available to all RTX GPUs via NVIDIA App override [2].
- Ray Reconstruction — replaces traditional RT denoising with AI, improving image quality in ray-traced scenes. Supported in specific titles including Cyberpunk 2077.
- DLAA — runs DLSS at native resolution as a pure anti-aliasing solution. Useful on a 4090 where you don’t need the FPS gain from upscaling but want better AA than TAA.
To upgrade to the DLSS 4 Transformer model in supported games: open the NVIDIA App, navigate to Graphics → Program Settings, select your game, scroll to Driver Settings, and set “DLSS Override — Model Presets” to Recommended. Requires driver 572.16 or higher and NVIDIA App version 11.0.2.312 or higher [2].
Frame Generation and input latency: Frame Gen adds approximately 10–15ms of input latency at typical frame rates. For story-driven and open-world games this is imperceptible. For competitive shooters where reaction time is the margin of victory—CS2, Valorant, Apex Legends—disable it and use NVIDIA Reflex instead. For a deeper comparison of upscaling technologies, see our DLSS vs FSR vs XeSS guide.
In-Game Settings — What Actually Costs FPS at 4K
With 24 GB of GDDR6X, the RTX 4090 has no practical VRAM ceiling for any current title. Settings that load into VRAM—texture resolution, texture filtering, and level of detail—can be pushed to maximum at zero FPS cost. The frame rate costs come exclusively from settings that add real-time computation per frame.
| Setting | FPS Impact at 4K | Recommended | Notes |
|---|---|---|---|
| Ray Tracing / Path Tracing | Very High (40–80%+ GPU cost) | On, use DLSS | Biggest lever; Cyberpunk PT drops to 16 FPS at native 4K without DLSS [4] |
| Global Illumination (RTGI / Lumen) | High (20–35%) | On, use DLSS | Dramatically improves scene lighting quality; expensive native, viable with DLSS FG |
| Shadow Quality | Moderate (15–25%) | High | Ultra vs High: subtle visual gain, meaningful FPS cost; High is the sweet spot |
| Ambient Occlusion | Moderate (8–12%) | High (SSAO) or RT AO with DLSS | Adds depth to surfaces; ray-traced AO costs more than screen-space AO |
| Reflections (SSR / RTR) | Moderate (10–18%) | SSR on; RTR with DLSS only | Ray-traced reflections are accurate but expensive; SSR is sufficient in most games |
| Volumetric Fog / Lighting | Low–Moderate (8–15%) | High | Atmospheric quality; Ultra is rarely distinguishable from High in motion |
| Foliage / Grass Quality | Low (5–10%) | Ultra | Loads into VRAM; near-free FPS cost within 24 GB, looks noticeably better at Ultra |
| Texture Quality | Zero (within VRAM) | Ultra / Highest | 24 GB removes the texture budget constraint entirely; always max |
| Anisotropic Filtering | Negligible | 16x (via NCP) | Lock globally in NVIDIA Control Panel; ignore the in-game option |
| Anti-Aliasing | Low–Moderate | DLSS / DLAA | If using DLSS, set in-game AA to Off or TAA; use DLAA at native for best quality |
| Motion Blur | None | Off | Zero FPS impact; personal preference; off for competitive clarity |
The practical summary: everything except ray tracing, global illumination, shadows, and ambient occlusion can be maxed on a 4090 at 4K without meaningful frame rate cost. Ray tracing settings are the only category requiring deliberate trade-offs.
Three Configuration Profiles
These profiles target different use cases. For the full system-level stack—BIOS, drivers, Windows power settings—see our PC FPS optimization guide.
Competitive — Low Latency Priority
For CS2, Valorant, Apex Legends, and any game where reaction time matters more than image quality.
| Setting | Value |
|---|---|
| Ray Tracing | Off |
| DLSS Super Resolution | Quality or Performance (target 200+ FPS) |
| Frame Generation | Off — adds input latency |
| NVIDIA Reflex | On + Boost |
| Low Latency Mode (NCP) | Ultra |
| Display Mode | Exclusive Fullscreen |
| V-Sync | Off; frame cap at monitor refresh rate |
| Shadow Quality | Medium (enemy visibility unaffected; FPS margin recovered) |
Max Quality — Single-Player AAA
For open-world, narrative, and immersive games where image quality is the priority.
| Setting | Value |
|---|---|
| Ray Tracing | High or Ultra (game-dependent) |
| DLSS Super Resolution | Quality (renders at ~1440p internally at 4K) |
| Frame Generation | On — latency acceptable in single-player |
| DLSS Transformer Model | Enable Recommended override in NVIDIA App [2] |
| Shadow Quality | High |
| Ambient Occlusion | High |
| Textures | Ultra / Highest |
| Low Latency Mode | On |
Path Tracing Showcase — Cyberpunk 2077 / Alan Wake 2
For games with full path tracing support. Frame Generation is not optional here—it is what makes the workload viable on RTX 40 hardware.
| Setting | Value |
|---|---|
| Ray Tracing Preset | Overdrive / Path Tracing |
| DLSS Super Resolution | Quality (4K output, ~1440p render target) |
| Frame Generation | On — mandatory; 16 FPS without it in Cyberpunk [4] |
| Ray Reconstruction | On (Cyberpunk 2077 only) |
| DLSS Transformer Model | Upgraded via NVIDIA App Recommended preset [2] |
| Expected FPS at 4K | 60–120 FPS depending on game and scene |
System-Level Optimizations
In-game settings only go so far. These changes affect every game and apply immediately.
- Resizable BAR — Enable in BIOS under PCI or Advanced settings. Supported on most Z490+ Intel and B550+ AMD motherboards. Verify it’s active: GPU-Z shows “Resizable BAR: Yes” under the Advanced tab [1].
- XMP / EXPO RAM Profile — Enable in BIOS. RAM running at DDR5-6000 vs stock DDR5-4800 improves 1% lows in CPU-bottlenecked scenarios—city areas in open-world RPGs, large strategy battles, NPC-dense environments.
- Windows Game Mode — On. Reduces background process interruptions during gameplay; measurable improvement in frame time consistency.
- HAGS — On (Windows Settings → Display → Graphics). Required for DLSS Frame Generation.
- CPU pairing — At 4K, the 4090 is GPU-limited in most games. But in CPU-heavy titles and scenes—Cyberpunk 2077 in Night City, Cities: Skylines 2, large Total War battles—a weak CPU creates a bottleneck no GPU setting can fix. A Ryzen 7 7800X3D or Intel Core Ultra 9 285K is the ideal pairing to avoid this.
- Fan curve — Use MSI Afterburner to target core temperatures below 85°C under sustained load. The default 4090 fan BIOS is tuned for quiet operation; running fans at 60–70% load can recover 5–10 MHz of sustained boost clock in extended gaming sessions.
Frequently Asked Questions
Does the RTX 4090 support Multi Frame Generation?
No. Multi Frame Generation—the 3x and 4x frame multipliers introduced in DLSS 4—is exclusive to RTX 50 series GPUs. The RTX 4090 supports DLSS Frame Generation (1x), which generates one additional frame between each rendered frame. RTX 40 series also receives the DLSS 4 Transformer model upgrade for Super Resolution and Ray Reconstruction via the NVIDIA App [2][3].
Should I use DLSS at 4K on a 4090?
Yes, for ray-traced and path-traced games. DLSS Quality at 4K renders internally at approximately 2560×1440 and upscales—the DLSS 4 Transformer model often produces results that are sharper than native 4K TAA while recovering the frame rate headroom ray tracing costs. For rasterization games already above 100 FPS, use DLAA instead: it runs DLSS at native resolution as a pure anti-aliasing pass, giving you the AI quality improvement without the resolution trade-off.
What FPS should I expect at 4K?
Without ray tracing: 80–140+ FPS depending on the game (average around 116 FPS across a broad game library). With standard ray tracing and DLSS Quality: typically 80–130 FPS. Path tracing with DLSS Quality and Frame Generation enabled: 60–120 FPS in supported titles. Your specific numbers will vary by game engine and scene complexity.
Why is my RTX 4090 showing low GPU usage alongside low FPS?
This is a CPU bottleneck. At 4K in most games, the 4090 should be near 100% GPU utilisation. If GPU usage drops below 80% while FPS also drops, the CPU is the limiting factor—common in NPC-dense environments in open-world RPGs, large strategy game battles, and simulation titles. GPU settings cannot fix this. Reducing CPU-taxed settings (crowd density, NPC count, foliage simulation) or upgrading the CPU are the correct solutions.
Sources
- NVIDIA. GeForce RTX 4090 Graphics Cards for Gaming. NVIDIA GeForce
- NVIDIA. Enabling DLSS 4 Overrides in NVIDIA App. NVIDIA Customer Help
- NVIDIA. DLSS 4.5 Dynamic Multi Frame Generation Announcement. NVIDIA GeForce News, January 2026
- The FPS Review. NVIDIA GeForce RTX 40 Series Benchmarks for Cyberpunk 2077 RT Overdrive Mode. The FPS Review, April 2023
- Tom’s Hardware. Alan Wake 2 Benchmarks Show RTX 4090 Hitting 130+ FPS at 4K With Maxed Out Ray Tracing. Tom’s Hardware
- TweakTown. NVIDIA Benchmarks STALKER 2: GeForce RTX 4090 with DLSS 3 Hits 4K 120FPS+ at Max Settings. TweakTown
- NVIDIA. How To Reduce Lag — A Guide To Better System Latency. NVIDIA GeForce Guides