A lack of PCIe bandwidth can reduce RTX 5090 performance by as much as 25% in video editing and 3D workloads. Puget Systems conducted a series of tests on NVIDIA's GeForce RTX 5090, comparing different PCIe versions and lane configurations to assess the impact on content creation tools. At its launch, TechPowerUp's scaling tests noted that the GeForce RTX 5090 is the first high-end card to adopt PCIe 5.0 x16, delivering 64 GB/s of bidirectional bandwidth—twice the 32 GB/s that the RTX 4090 achieves on PCIe 4.0 x16. Our testing revealed a potential performance impact of up to 25% when utilizing limited PCIe bandwidth. Puget Systems today put this interface to the test, confirming real‑world impacts on video editing workflows when lanes or generations are constrained.

In DaVinci Resolve benchmarks, Puget Systems found that configurations running at PCIe 5.0 x16, PCIe 5.0 x8, or PCIe 4.0 x16 yielded virtually identical render times. Dropping to PCIe 5.0 x4, PCIe 4.0 x8, or PCIe 3.0 x16 introduced a modest 10% slowdown. Further reducing bandwidth to PCIe 4.0 x4 or PCIe 3.0 x8 resulted in an increase of roughly 25% in render times. After Effects exhibited only minor slowdowns once the bandwidth dropped below 8 GB/s. Unreal Engine 5.5 virtual production tests recorded about a 7% drop in average frame rates at the lowest lane counts. By contrast, Blender offline renders and OctaneBench scores remained essentially unchanged, and Llama LLM benchmarks showed no measurable dependency on PCIe speed.