The PSU you are talking about only fits specific HP servers. See the description on the ebay page you sent. Also it doesn't have any certification regarding its efficiency, which is important for mining hardware.
The PSU on the miner is this one http://www.super-flower.com.tw/products_detail.php?class=2&sn=8&ID=62&lang=
and it supports all common motherboards. You can use it to build an ethereum mining rig. (the bulk of the initial costs is PSU + GPUs)
And it is 80 Plus Gold Certified. See here https://plugloadsolutions.com/psu_reports/SUPER%20FLOWER_SF-1000P14XE_ECOS%201822_1000W_Report.pdf
and here http://www.tomshardware.co.uk/forum/327742-28-80plus-bronze-silver-gold-platinum
It's right, if you go for this PSU, you have to be a little bit hacker (in maker sense), I use those to power up Antminer S7, so far no issue.
Yes for that I need to search a bit, how to make the power ON switch, and make a bit of welding.
Anyway those are cheap and good PSU.
