I kind of blew it with my headline for the thread. Almost like I was assuming everybody knows about Dell T5810. Should have started with something like, "Looking for a high quality trading computer at a bargain price"?.... and then described the machine a bit. Most people reading only the headline probably think, "What? Any old computer for trading... and an el-cheapo at that"?
I'd been watching for the T5810s to come around off lease on the used market for the last year or so. Well, they're here now. Workstation computers have a real life expectancy of 10 years or so due to having been made with quality/server parts. (My Dell T3500 workstations were bought off lease in 2012, for ~$400 each. Still going strong. But Dell didn't produce W10 drivers for the model, so forced to upgrade my hardware.) Buying with 70% of its life left for 75% off of the original price is a deal in my book.
Can now add Dell Precision T5810 to my rec of HP Z440 (they are equivalent) for trading computers.
FWIW....