28-Way NVIDIA GeForce GPU Comparison On Ubuntu: From GeForce 8 To GeForce 1080
The open-source Tesseract game is one of the lighter titles tested and can run better on the old NVIDIA GPUs while still scaling on the newer NVIDIA GPUs.
From best to worst, there is a 11x difference in performance-per-Watt.
Xonotic tends to be CPU bound on the newer NVIDIA GPUs but still can see the measurable advancements made by succeeding NVIDIA generations. The GT 240 had an issue running Xonotic.