A couple of weeks ago, the boy said he was going to buy a computer. He'd been looking on Amazon. Technolust for keyboards giving him a rationale for ditching the i3 based Vostro I picked up from the Dell Outlet four and a half years ago -- in fairness it's been waiting on an SSD I already bought and a Windows reinstall for a couple of months.
Inspired by this article [1] and my experience with what is now an eight year old dual E5405 Xeon workstation that given enough RAM is simply never insufficiently powerful, I suggested we build a used Xeon system that kicks ass and takes names. Amazingly he acted as if he didn't know everything.[0]
After discovering the vageries of LGA 2011 sockets and the price of version 1 motherboards versus version 3 and the problems of C1 versus C2 stepping I gave up and priced out a new AMD FX 8350 system. But before pulling the trigger, I did some Ebay.
Yesterday, it came: a used buy-it-now Dell Precision T7500. If the hyperthreading hexacore Xeon 5660 doesn't meet all of the boy's computing needs through the rest of high-school and some college (technolust aside), adding a pair of PCIe 16X GPU cards and bumping up to 96gigs of RAM might help.
It all cost less than a used 1100 power supply and quality tower case are likely to fetch on Ebay, not to mention leass than a budget level new assemble it myself AMD box. As a bonus it came with a Winows Product Key sticker [not part of the listing] and it was running a Windows 10 upgrade [2] within a couple of hours of hauling all forty or so pounds of it in from the front door.
For me, it's not that the extra bit of performance isn't worth the money. It is more performance for the dollar. And I'd be that a used workstation is going to be more reliable than a bunch of new consumer components: it's passed several years of burn in under warranty.
[0]: Sometimes, it happens.
[1]: http://www.techspot.com/review/1155-affordable-dual-xeon-pc/
[2]: I pitched Linux. Sometimes, it [0] doesn't happen.