If you’ve ever searched for a GPU stress testing tool, two names come up more than any others: MSI Kombustor and FurMark. Both are free, both are widely used by PC enthusiasts and overclockers, and both can push your graphics card to its absolute limits. But they are not the same tool, and choosing the right one depends on what you’re trying to achieve.
In this comparison, we’ll break down the key differences between MSI Kombustor and FurMark so you can decide which GPU stress test is better suited for your needs.
MSI Kombustor is a free GPU benchmarking and stress testing utility developed by Geeks3D (JeGX) in partnership with MSI. It is based on the FurMark engine but has been significantly expanded with additional test modes, API support, and features. Kombustor supports OpenGL, Vulkan, and DirectX rendering, includes an artifact scanner, and integrates directly with MSI Afterburner for real-time monitoring during stress tests.
You can download MSI Kombustor here. The latest version is v4.1.36 (92 MB, 64-bit).
FurMark is a lightweight, free GPU stress test and OpenGL benchmark developed by Geeks3D. It has been around since 2007 and is widely regarded as one of the most aggressive GPU torture tests available. FurMark renders a fur-covered donut (torus) at maximum GPU load, pushing the card to its peak temperature and power draw within minutes. It is primarily an OpenGL-based tool, though FurMark 2 has added Vulkan support.
FurMark is often called a “power virus” because of how aggressively it loads the GPU. It is designed specifically to find the thermal ceiling of your graphics card.
| Feature | MSI Kombustor | FurMark |
|---|---|---|
| Developer | Geeks3D / MSI | Geeks3D |
| APIs Supported | OpenGL, Vulkan, DirectX | OpenGL (Vulkan in FurMark 2) |
| Test Modes | Multiple (MSI-01, PhysX, PBR, DoF, artifact scan) | Single fur rendering test + presets |
| Intensity Level | Moderate to High (adjustable) | Extreme (torture test) |
| Afterburner Integration | Yes (launch from Afterburner) | No |
| Artifact Scanner | Yes | No |
| Vulkan Support | Yes (full) | Limited (FurMark 2 only) |
| DirectX Support | Yes | No |
| Benchmark Mode | Yes (scored) | Yes (scored) |
| Price | Free | Free |
This is where the two tools diverge the most. FurMark is a torture test. Its single purpose is to push your GPU to its absolute thermal and power limit as fast as possible. It is not uncommon for FurMark to push a GPU to its thermal throttle point within 3 to 5 minutes. Some users have reported artifacts and automatic shutdowns during FurMark runs, especially on cards with insufficient cooling or aggressive overclocks.
MSI Kombustor, on the other hand, is more balanced. While it can certainly push your GPU hard, it offers multiple test modes with varying levels of intensity. The MSI-01 demo, physically based rendering (PBR) test, depth-of-field test, and artifact scanner all stress the GPU differently. This makes Kombustor more useful for finding specific weaknesses in your overclock rather than just maxing out temperature.
If you want to know your GPU’s absolute thermal ceiling, FurMark will get you there faster. If you want a more nuanced stability test that covers different rendering scenarios, Kombustor is the better choice.
Use MSI Kombustor if:
Use FurMark if:
Use both if:
MSI Kombustor and FurMark are both excellent free GPU stress testing tools, but they serve slightly different purposes. FurMark is the king of raw thermal stress testing — it will push your GPU harder and hotter than almost any other tool. MSI Kombustor is a more versatile stress testing and benchmarking suite with multiple test modes, Afterburner integration, artifact scanning, and support for all major graphics APIs.
For most users, MSI Kombustor is the better all-around choice, especially if you already use MSI Afterburner. But if you want to know your card’s absolute thermal limits, FurMark is an essential tool to have in your toolkit as well.
Ready to test your GPU? Download MSI Kombustor and get started.