The system requirements for Resident Evil 4 vary significantly depending on whether you are playing the 2023 Remake or the original 2005 version (often sold as the Ultimate HD Edition). Below are the detailed specifications for both versions.

## Resident Evil 4 Remake (2023)
The 2023 remake uses the RE Engine, requiring modern hardware to handle its high-fidelity assets, lighting, and physics.

### Minimum System Requirements
These specs are designed to achieve roughly **1080p at 45 FPS** when using the “Prioritize Performance” preset.
* **OS:** Windows 10 (64-bit) / Windows 11 (64-bit)
* **Processor (CPU):** AMD Ryzen 3 1200 or Intel Core i5-7500
* **Memory (RAM):** 8 GB
* **Graphics (GPU):** AMD Radeon RX 560 (4GB VRAM) or NVIDIA GeForce GTX 1050 Ti (4GB VRAM)
* **DirectX:** Version 12
* **Storage:** Approximately 55 GB to 67 GB available space (SSD highly recommended)

### Recommended System Requirements
These specs are designed to achieve **1080p at 60 FPS**.
* **OS:** Windows 10 (64-bit) / Windows 11 (64-bit)
* **Processor (CPU):** AMD Ryzen 5 3600 or Intel Core i7-8700
* **Memory (RAM):** 16 GB
* **Graphics (GPU):** AMD Radeon RX 5700 or NVIDIA GeForce GTX 1070
* **DirectX:** Version 12

### Ray Tracing Requirements
To enable Ray Tracing features, your hardware must meet higher GPU standards:
* **Minimum GPU for RT:** NVIDIA GeForce RTX 2060 or AMD Radeon RX 6700 XT.
* **Note:** Ray Tracing is extremely VRAM-intensive. For stable performance with RT enabled, 8GB of VRAM is considered the baseline, while 12GB+ is recommended for higher resolutions.

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## Resident Evil 4: Ultimate HD Edition (2005/2014)
The original game was re-released on Steam as the “Ultimate HD Edition” with improved textures and 60 FPS support. Its requirements are very low by modern standards.

### Minimum System Requirements
* **OS:** Windows XP / Vista / 7 / 8 / 10
* **Processor (CPU):** Intel Core 2 Duo 2.4 GHz or AMD Athlon X2 2.8 GHz
* **Memory (RAM):** 2 GB
* **Graphics (GPU):** NVIDIA GeForce 8800GTS or ATI Radeon HD 4850
* **DirectX:** Version 9.0c
* **Storage:** 15 GB available space

### Recommended System Requirements
* **OS:** Windows Vista / 7 / 8 / 10
* **Processor (CPU):** Intel Core 2 Quad 2.7 GHz or AMD Phenom II X4 3 GHz
* **Memory (RAM):** 4 GB
* **Graphics (GPU):** NVIDIA GeForce GTX 560 or better

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## Performance Targets & Optimization Tips
If you are struggling to maintain a stable frame rate in the **2023 Remake**, consider the following adjustments:

* **VRAM Management:** The game features a VRAM usage meter in the settings menu. If the bar turns red, you are likely to experience crashes or severe stuttering. Lower **Texture Quality** and **Shadow Quality** first to free up memory.
* **Upscaling:** Use **AMD FSR 2** or **NVIDIA DLSS** (via mods, as it is not natively supported in the base launch version) to significantly boost FPS at higher resolutions like 1440p or 4K.
* **Hair Strands:** This setting is particularly demanding on the GPU. Turning it off can provide a noticeable performance boost without significantly impacting the overall visual atmosphere.
* **Storage Speed:** While the game can run on a mechanical HDD, an SSD is strongly recommended to prevent “hitchcing” or stuttering when moving between large areas of the map.