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So, I decided to tell you the experience of using the cheapest, but new components:
Motherboard: Asus AM1M-A
Processor: AMD Sempron 2650
Power Supply: Aerocool VX800
Graphics Cards: Palit GTX 1060 StormX + 2 * Gigabyte GTX 1060 Mini ITX OC
Memory: ssd - 60gb, ram - 4gb
Wi-fi adapter: TP-LINK TL-WN725N
Riser: Red v007 with SATA connector
This assembly was released at $ 945
And now let's go through each of the lists: "motherboard" is just the cheapest with 3 PCI-e slots, the cheapest processor is for it.
Again, the cheapest power supply with 4 PCI-e power connectors, in fact, at least 3 cards requires 700, but this one was 800 cheaper and on the 12-volt line it gives 744, which is with the head. It's surprisingly quieter than 3 cards and it does not warm at all. At the moment, not in one of the stores is not already on sale ...
Further cards - bought "palit" first, and a week later a wild deficit of video cards began and quickly took away what was left for the lowest price. Yes, he flushes in the drain warms up 73, and when he put another card next to it, it became 82 (decision - to lower the power limit, that would not be more than 78 and threw over +200 MHz). And "hygi" work at the drain frequency, and since these are versions of OC, in this mode there is +25. Temperatures 71 and 68. As a result, we can conclude that it is better to buy cards with copper tubes, but since I'm a poor student, I take it cheaper)
Well, at the expense of memory, adapter and riser everything is simple - bought what was worth the least. This system has been working for more than 2 weeks without failures and problems, the average figure from three cards is 830 "salts".
In the future I plan to assemble a similar system, but on rx 570 cards and with a power supply unit for 900 watts already.
Have any questions, then write - if possible, I will answer