RustFPS onCore i5-8500B&GeForce RTX 4090

Rust

A true test for system memory. Procedural maps can exhaust RAM quickly; 16GB is the minimum, and 32GB is recommended. CPUs with 3D V-Cache (AMD X3D) offer massive performance gains here.

Rust - FPS Estimates by Resolution

Actual FPS may vary based on RAM speed, background processes, and other system factors

1080P
low142 FPS
medium130 FPS
high105 FPS
ultra82 FPS
1440P
low114 FPS
medium96 FPS
high70 FPS
ultra55 FPS
4K
low49 FPS
medium40 FPS
high31 FPS
ultra21 FPS

Performance Report

Rust

GeForce RTX 4090 + Core i5-8500B
🎮Visual Experience

At 1080p, all quality settings exceed 82 FPS. At 1440p, frame rates range from 55 to 114 FPS. At 4K, frame rates range from 21 to 49 FPS.

Official Requirements

The GeForce RTX 4090 is 244% above the recommended GPU (GeForce GTX 980) for Rust. The Core i5-8500B is 13% below minimum CPU requirement.

⚙️Bottleneck Analysis

The Core i5-8500B determines the performance ceiling at all 1080p settings, all 1440p settings, all 4k settings, while the GPU has headroom.

💰Value Analysis

Approximated average price on current market:

GeForce RTX 4090:$1649(updated 2/6/2026)
Official Launch Price: $1599
Core i5-8500B:$192(updated 2/6/2026)
Official Launch Price: $192

Combo price: $1841. At 1080p Ultra, this combo delivers 82 FPS, equivalent to 0.04 FPS per dollar.

ResolutionLowMediumHighUltra
1080p0.077 fps/$0.071 fps/$0.057 fps/$0.045 fps/$
1440p0.062 fps/$0.052 fps/$0.038 fps/$0.030 fps/$
4k0.027 fps/$0.022 fps/$0.017 fps/$0.011 fps/$

* Table values represent FPS per Dollar (higher is better)

Performance Limiter Analysis

Core i5-8500B|GeForce RTX 4090
📈Analysis

At 4k ultra, the Core i5-8500B sets the ceiling at about 21 FPS, while the GeForce RTX 4090 could reach 84 FPS. In this scenario, the CPU limits the GPU potential by 75% (FPS gap: 63 FPS). Overall distribution: CPU limits 12/12 cells, GPU limits 0/12, balanced 0/12.

Verdict

CPU Limits GPU

Your Core i5-8500B is the limiting side in the heaviest mismatch. This means part of the GeForce RTX 4090 rendering potential remains unused in those settings.

🧩Detailed Breakdown
1080p (Full HD)
LowCPU Limits GPU 42%
MediumCPU Limits GPU 43%
HighCPU Limits GPU 43%
UltraCPU Limits GPU 49%
1440p (2K QHD)
LowCPU Limits GPU 49%
MediumCPU Limits GPU 55%
HighCPU Limits GPU 54%
UltraCPU Limits GPU 56%
4K (Ultra HD)
LowCPU Limits GPU 66%
MediumCPU Limits GPU 70%
HighCPU Limits GPU 70%
UltraCPU Limits GPU 75%
Percentages show how much potential FPS of the stronger component is lost because the other component has a lower FPS ceiling.
🧠Methodology

We estimate the maximum FPS the processor can sustain and the maximum FPS the graphics card can sustain in each setting, then compare those limits directly.

Limit Factor formula: (stronger - weaker) / stronger. Example: if CPU ceiling is 200 FPS and GPU ceiling is 140 FPS, then GPU limits CPU by 30%.

CPU Limits GPU means the processor ceiling is lower. GPU Limits CPU means the graphics ceiling is lower. Balanced means the FPS ceilings are close enough that the gap is negligible.

The displayed percentages are derived from FPS ceilings, not generic utilization heuristics.

Rust Requirements Comparison

See how your processor and graphics card compare against the game official minimum and recommended system specs. The placement of your hardware is calculated using relative synthetic performance scores to help you gauge overall playability.

CPU - Core i5-8500B
cpu icon
8,900
Your Score
MinimumCore i7-3770
RecommendedCore i7-4790K
GPU - GeForce RTX 4090
gpu icon
38,112
Your Score
MinimumGeForce GTX 670
RecommendedGeForce GTX 980

Your hardware is below minimum requirements. CPU is the limiting factor (13% below minimum). Expect performance issues. Low settings recommended.

CPU

-27%vsrecommended

GPU

+244%vsrecommended

CPU

-13%vsminimum

GPU

+589%vsminimum

Minimum Requirements
Video Card: GeForce GTX 670
Processor: Core i7-3770
Memory: 10 GB
Disk Space: 25 GB (SSD)
System: Windows 10 64-bit
Recommended Requirements
Video Card: GeForce GTX 980
Processor: Core i7-4790K
Memory: 16 GB
Disk Space: 25 GB (SSD)
System: Windows 10 64-bit

Frequently Asked Questions

1Can the Core i5-8500B and GeForce RTX 4090 run Rust well?

Yes, the Core i5-8500B paired with the GeForce RTX 4090 can run Rust smoothly up to 1080p achieving around 82 FPS at Ultra quality. Your GPU is 244% above the recommended specs, and your CPU is 27% below the recommended requirements.

2Is there a more cost-effective setup to run Rust?

This CPU + GPU combo costs approximately $1841 ($192 CPU (Rank #351 Value) + $1649 GPU (Rank #77 Value)). Since the CPU is the main limiting factor, investing in a stronger processor will improve your framerates and overall value. For example, the Ryzen 9 9950X is a great upgrade option for around $649 (Rank #5 for value).

3Which component should I upgrade first to improve Rust performance?

For Rust, upgrading the CPU would have the biggest impact on performance. The Core i5-8500B is currently the limiting factor — the GeForce RTX 4090 has extra headroom that a faster processor could take advantage of. This is especially noticeable at 1080p where CPU performance matters more. CPU-limited at: 1080p low, 1080p medium, 1080p high, 1080p ultra, 1440p low, 1440p medium, 1440p high, 1440p ultra, 4k low, 4k medium, 4k high, 4k ultra.

4Does this setup support Frame Generation for Rust?

Rust does not currently support Frame Generation technologies like DLSS 3 or FSR 3. Your performance is based entirely on native rendering. If the game adds support in a future update, newer GPUs will benefit the most.

5What are the minimum and recommended specs for Rust?

Rust requires at minimum a Core i7-3770 (CPU) and GeForce GTX 670 (GPU) with 10 GB RAM and 25 GB (SSD) storage. For the recommended experience, you need a Core i7-4790K and GeForce GTX 980 with 16 GB RAM. Your hardware falls below the minimum requirements for this game, which may result in poor performance.

6How accurate are these Rust FPS estimates for the Core i5-8500B and GeForce RTX 4090?

These Rust FPS results are not arbitrary numbers. They come from calculations informed by thousands of real gaming benchmarks, and the typical accuracy range is around 10% to 15%. That makes them far more useful than generic FPS calculators that simply invent values without a benchmark foundation. Actual in-game performance can still vary with drivers, updates, RAM configuration, cooling, and the exact scene being rendered.

Performance estimates are based on synthetic benchmarks and hardware capabilities.

Results may vary based on drivers, OS, and background processes.