Was reading through that thread and was just thinking I’d update my topic saying that it seems I have found all the info necessary for now.
Still as I am new to this, I will list my possible configuration here a bit later, and ask for an approval from you a bit later.
[doublepost=1517409357][/doublepost]For initial thoughts I think it could be:
2x 6 core Westmere CPU;
2xsmall SSDs + some ‘hybrid’ (SSD+HDD) drive;
RX560?;
32Gb 1333Mhz RAM;
PCI USB card;
P.S. Just to be sure: I better need a 2010 base for Westmere CPUs or 2009 will do fine? Were there some socket difference? Too much info for me all together
Since your original post mentioned about "at least Quad", I don't expect you need (or can) utilised 12 cores in general.
Depends on your usage, more cores may give you literally zero benefit.
Also, for low cost setup, single processor 4,1 is the best. 4,1 is cheaper than 5,1 in general. But the single processor 4,1 and 5,1 are virtually the same machine. It's so much easier to upgrade a single processor 4,1 to 5,1 because it use normal CPU.
For low cost, you may pay some attention on the X5677, this processor match the W3690 and X5690 in most situation, and only fall behind when you need more than 4 cores.
4x8 GB 1333 ECC RAM should be pretty cheap, but again, if you don't need that much, reduce it to 3x8GB will save you a bit, and actually make the memory work a little bit faster (the memory work faster doesn't imply the whole system is faster, because the system can use the extra RAM as cache, less cache can reduce overall performance).
SSHD is a good option, however, depends on how you use it. It may give you little extra benefit in speed (e.g. for storing large video files), but simply cost more.
It's totally possible to get a single processor 4,1 and a X5677 within $400. (This should also include the original CPU, HDD, some RAM, and a Mac graphic card. e.g. W3520, 640GB HDD, 4x1GB RAM, and a GT120)
A RX560 and a USB 3.0 card for $200
And a 240GB SSD, 3x8GB server pulled 1333MHz ECC RAM, and a 1TB SSHD for the remaining $200
TBH, it's a hard time to do this. All graphic cards, memory, and SSD's price went up quite a bit. I got my 120GB SSD for just $30 two years ago, 4x8GB ECC RAM only cost $75 by that time.
At this moment, I expect you need to pay around $180 for a RX560, $20 for USB 3.0 card, $65 for 240GB SSD, $75 for 3x8GB RAM, $55 for a 1TB SSHD (All these price are from Amazon or eBay about 5 minutes ago)