Rendering Performance Calculator
Estimate 3D render performance for your build with scores and render times for Blender, Cinema 4D Redshift, Unreal Engine 5 and Octane.
CPU or GPU rendering?
Modern render engines fall into two camps, and which you use changes the hardware that matters completely. GPU renderers — Redshift, Octane, Blender Cycles in GPU mode — are often ten times faster than CPU rendering the same scene. CPU renderers remain in use because they handle unlimited scene complexity and produce reference-quality output.
VRAM is the hard limit for GPU rendering
A GPU renderer must fit the entire scene — geometry, textures, and everything else — into video memory. Exceed it and the render either fails outright or falls back to a much slower out-of-core mode. This is why 24 GB cards command such a premium among 3D artists: it is a capability threshold, not a speed increment.
System memory for CPU rendering
CPU rendering uses system RAM instead, which is far cheaper per gigabyte. 64 GB handles most professional work comfortably and 128 GB covers heavy simulation and large scenes. This is the main reason complex production scenes are still rendered on processors.
Viewport versus final render
These are separate problems. Viewport responsiveness while you model is dominated by the graphics card and by single-thread CPU performance. Final render time is dominated by whichever device your engine uses. A machine can feel sluggish to work in yet render quickly, or the reverse.
Sustained load changes the cooling equation
A render runs at 100% load for minutes or hours, unlike gaming's variable load. Cooling that is adequate for games can throttle badly here, costing far more time than the hardware difference it was meant to save. Check yours with the CPU Cooler Compatibility and Case Airflow tools.
Frequently asked questions
Is GPU rendering always faster than CPU?
For scenes that fit in VRAM, usually by a large margin - often five to ten times. Once a scene exceeds video memory the advantage disappears, which is why complex production work still uses CPU rendering.
How much VRAM do I need for 3D rendering?
12 GB handles most hobbyist work. 16 GB is comfortable for professional scenes and 24 GB or more is the target for heavy production. Unlike speed, this is a hard limit rather than a gradual slowdown.
Do more CPU cores always help?
For CPU rendering, almost linearly - it is one of the few workloads that scales that well. For viewport responsiveness and for GPU rendering, single-thread speed matters more than core count.
Does storage speed matter for rendering?
For the render itself, very little. It matters for loading large scenes, for texture streaming and for writing image sequences - all of which affect how the workflow feels rather than the render time.