Before 1985, I never had computer problems. My equipment were retired because of advances in technology. After that date, component makers switched to MADE IN CHINA. Quality plummeted. This affected me. I had three desktops running 24/7. The motherboards usually died within 2.0 years. Because MB manufacturing has a three-year life span, I was forced to spend $3,000 on new desktops every other year. Doing the math, my annual cost for computering came to $500 per unit..A relative suggested workstations as an alternative, especially the HP Z820. He outlined the advantages:.1. The military, data centers, universities, and businesses required reliable computers for critical work. So, HP designed this model under military specs. Only the best materials were used for manufacturing motherboards, memory, and CPUs. Researching the internet, memory and CPUs average life spans were 20-to-30 years..2. The only weaknesses were the motherboard and the power supply. In regards to the latter, circuits wore out. Thin wiring got brittle because of heating and cooling; they broke. On the former, there was an expectation that the MB would last more than five years. Because equipment retirements and standard warranties on business computers were +5 years, the motherboard had to function beyond this critical milestone and more..Anyways, I could not afford a $10,000 HP Z820, the average price for a new unit. However, USED models were selling at +$500 on Amazon. If a person shopped the auction and local sales websites, $300 units were available on rare occasions. So, the price equaled my average annual cost for computering. If the used equipment functioned beyond one year, I was financially ahead..Anyways, I took a chance, purchased this beast, and marveled at its design. It was an engineering masterpiece:.1. Everything was tool-less. Press the "green latches," and the component detached.2. A plastic cover contained six fans to cool down CPUs, memory, and plug-in boards.3. Cables were routed under the motherboard and hidden away.4. The proprietary power supply slipped OUT and IN using a handle.5. The BMW designed case had the "look and feel" of simplicity, eloquence, quality, and brute strength. Aluminum panels covered the 60 lb. case. with black plastic on the edges.6. "Attention to detail" was noticeable. The side aluminum panel came off effortlessly with a latch. On the inside were diagrams on memory installation, PCIe configuration notes, and specs. All were attractively itched by laser..Powering it up, it took 2.5 minutes on a SSD to go through the server routines. With 16-cores and 32-threads of computer power, tasks were done in an instant. Secondly, the 2GB AMD Quadro graphics board was fast, and screen changes were quick. There was no "lag time" during operations. Everything went smoothly with no unexpected freezes or crashes..With 64GB of memory and a server, I was able to multi-task. I was effortlessly doing eight things at once. EXCELL was opened. I was using WORD 2016 to compose a document and transferring figures from the spreadsheet. At the same time, three different browsers were used to hunt for information and references for the document. In the background, USENET and eMULE were downloading files. MEDIA MONKEY was playing rock music..This was a new experience. On a regular retail computer, operating three programs was the maximum. Any more led to errors, auto reboots, freezes, or "blue screen of death." I was so impressed, that I purchased two more USED HP Z820s..Please be reminded that you are buying retired workstations. The components have at least five years of usage. Some have more, as much as a decade. They will die, usually after the sales warranty ends. So, expect to replace the power supply and hard drives. If the motherboard and cooling fans continue to work for over a year, you "have your money's worth."