A Source engine sandbox where performance depends entirely on the mods and contraptions you spawn. RAM errors are common on systems with only 4GB.
Actual FPS may vary based on RAM speed, background processes, and other system factors
Performance Report
At 1080p, performance runs at around 54 FPS. At 1440p, frame rates range from 42 to 54 FPS. At 4K, frame rates range from 23 to 54 FPS.
The GeForce RTX 4090 is 1051% above the recommended GPU (GeForce GTX 750) for Garry's Mod. The Xeon L5420 is 29% below minimum CPU requirement.
At lower resolutions (1080p (low/medium/high), 1440p (low/medium/high), 4k low), the Xeon L5420 sets the FPS ceiling. As graphical load increases at (4k (high/ultra)), the GeForce RTX 4090 becomes the FPS-limiting side. The FPS ceiling is closely matched at 1080p ultra, 1440p ultra, 4k medium.
This section is based on estimated CPU/GPU FPS ceilings, not utilization percentages.
At 1080p low, the Xeon L5420 sets the ceiling at about 54 FPS, while the GeForce RTX 4090 could reach 130 FPS. In this scenario, the CPU limits the GPU potential by 58% (FPS gap: 76 FPS). Overall distribution: CPU limits 7/12 cells, GPU limits 2/12, balanced 3/12.
Your Xeon L5420 is the limiting side in the heaviest mismatch. This means part of the GeForce RTX 4090 rendering potential remains unused in those settings.
| Resolution | Low | Medium | High | Ultra |
|---|---|---|---|---|
| 1080p (Full HD) | CPU Limits GPU 58% | CPU Limits GPU 46% | CPU Limits GPU 24% | Balanced |
| 1440p (2K QHD) | CPU Limits GPU 44% | CPU Limits GPU 30% | CPU Limits GPU 24% | Balanced |
| 4K (Ultra HD) | CPU Limits GPU 14% | Balanced | GPU Limits CPU 28% | GPU Limits CPU 46% |
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.
A component can still be the FPS limiter without reaching 100% utilization. The displayed percentages are derived from FPS ceilings, not generic utilization heuristics.
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.
Your hardware is below minimum requirements. CPU is the limiting factor (29% below minimum). Expect performance issues. Low settings recommended.
-84%vsrecommended
+1051%vsrecommended
-29%vsminimum
+11449%vsminimum
The Xeon L5420 and GeForce RTX 4090 will struggle to run Garry's Mod at smooth framerates. At 1080p Ultra, you can expect around 54 FPS which is classified as "playable". Consider lowering settings or upgrading your hardware.
Price data is not currently available for this combination. In general, look for setups where the CPU and GPU are balanced — this ensures you're not overspending on one component that the other can't keep up with.
For Garry's Mod, upgrading the CPU would have the biggest impact on performance. The Xeon L5420 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, 1440p low, 1440p medium, 1440p high, 4k low. GPU fully utilized at: 4k high, 4k ultra.
Garry's Mod 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.
Garry's Mod requires at minimum a Pentium 4 (CPU) and GeForce 6 series (GPU) with 4 GB RAM and 5 GB storage. For the recommended experience, you need a Core i5 and GeForce GTX 750 with 8 GB RAM. Your hardware falls below the minimum requirements for this game, which may result in poor performance.
These Garry's Mod 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.
