OK, just clicked 2 random links.. All I see is a bunch of noobs who are jumping headfirst into mining and have no clue what they're doing or how hardware works.
most are new. people but not all.
I have done lots of studies on 6-7-8 card rigs.
if they are not riser free and none are like that unless you have empty panda miner boards fill with galax katana 1070's
the drawbacks are real. Risers die faster then slots
and savings do not come into effect unless you have 30 cards or 5 rigs.
The three and four card rigs I build do not kill the mobos
Of 13 biostar mobos 1 died and was rma took 91 days . But all boards are good.
the psu's for my current builds are 5 year warranty rosewill quark platinum 850 watts on sale at 85 bucks.
I can do 3 nvidia's on a board and hash at 1700 sols at 525 watts
a six card rx 480 does 1800 sols 900 watts maybe 800 watts with good flashing
cost 3 nvidia gpu's on sales 1600
6 msi rx 8gb gamer rx 480 gpus on sales 1400