My Optiplex 990 with 16GB RAM, NVIDIA GeForce GTX 1050 ti & well over one 1TB of storage. Not the most impressive sleeper here, but by far my most powerful & capable
GeForce 900 series - Wikipedia
Specification GeForce GTX 980 GAMING 4G | MSI Global - The Leading Brand in High-end Gaming & Professional Creation
Nvidia GTX 990 Ti 24GB And AMD R9 395X2 16GB Benchmarked and Reviewed