Not quite sure what you're getting at. I'm saying it's a good idea to utilize used server hardware, but comparing direct performance between unrelated products are daft.
Using the 2683 as an example, you can buy one of those for $350 and a brand spanking new motherboard (incl. 20% VAT and an extra 20% tax from my country) for $220, giving you 14c/28t @ 2.0-3.0GHz at less than half the power usage (from CPUs isolated of course) and a more stable overall setup.
PS. $200 for an SSD is way overkill, unless you need a lot of storage for individual install folders or VMs.
But my point was to illustrate your post with details, I had recent experience with.
As a side note for the E5-2683, stay away of low-clocked many cores, since they do not tend to use the boost 3.0GHz on full load. I cannot say from personal experience with exact numbers, but as being told from a hardware technician, who build custom servers and workstations for the living this 2.0GHz default / 3.0GHz boost clock sample use its boosted speed only if one or a few cores are at 100% load, but once all 14 cores got on full load - in real-life scenario or in middle of benchmark test, their boost speed never reach the advertised 3.0GHz.
So it is better to get a Xeon with higher default clock, like the E5-2650 or so.
That was the reason why for my budged under $1000 I got after the old LGA1366 Xeon setup, due to their affordable X5680s, running at 3.3Ghz per 6 cores for only $110 per CPU.
I noticed this scenario even with it - Xeon X5680, default 3.3GHz, boost 3.6GHz, on full load in benchmark boost up to 3.43GHz, not a penny higher!
Btw, $200 SSD was for not regular handy-capped from the SATA3 interface @500MB/s SSD but for PCIe Kingston HyperX Predator 256GB 1400/1000 MB/s read/write. Yes it was not mandatory for botting rig but I just liked its speeds
For the fun, I even bought off ebay a boxed GTX1060, with box, signed by tons of Blizzard developers from the recent Blizzcon! It is better, when we pair the work with the fun after all
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