I started with Dell Inspiron 3847 (Intel 4 Core i5-4460 @3.20GHz), 16GB RAM. I refuse to consider that an antique.
I tried a number of graphics cards (thanks, Amazon return policy) and ended with
AMD RX 560D-4G D5 from Yeston. 4GB GDDR5 128bit Gaming Video Card, PCI Express 3.0 x 8, DirectX 12, OpenGL 4.5, Desktop Computer Low Profile GPU with VGA/DVI-D/HDMI Tri-Ports
$260 from Amazon: https://www.amazon.com/gp/product/B097P3YP4G/
The MSI GeForce RTX 3060 Ventus 2X Overclocked Graphics Card 12GB GDDR6 PCIe 4.0 Dual-Fan Afterburner Overclocking Utility, at $950, was more intense than my computer.
CA X13 looks great. I'm sure serious ray tracing projects would go much faster with a "modern" workstation, but I'll stick with my Dell for now.
ADallas's post in What video card for X13? was marked as the answer