CPU - Intel Pentium G4560 - $75.00

http://www.umart.com.au/newsite/goods.php?id=37830

Motherboard - Asus Prime Z270-A - $249.00

https://www.pccasegear.com/products/37719/asus-prime-z270-a-motherboard/

2x eVGA 750W G2 80+ Gold Full Modular Power Supply - $149.00ea

http://www.umart.com.au/newsite/goods.php?id=28879

Alternative PSU - http://www.umart.com.au/newsite/goods.php?id=29913

or - http://www.umart.com.au/newsite/goods.php?id=25485

Corsair 8GB (1x8GB) CMK8GX4M1A2400C14 DDR4 RAM - $95.00

http://www.umart.com.au/newsite/goods.php?id=32767

Corsair 120GB Force Series LE200 SSD - $99.00

http://www.umart.com.au/newsite/goods.php?id=37554

2x M.2 PCI Extenders - $4.79 ea

https://cryptomined.com/index.php?main_page=product_info&cPath=1_13&products_id=9&zenid=0aevccs5ta57i1qpoklppi07h3

8x PCIE 1x-16x USB 3.0 Risers V7 - $6.99ea

https://cryptomined.com/index.php?main_page=product_info&cPath=1_215&products_id=199&zenid=0aevccs5ta57i1qpoklppi07h3

Dual PSU Connection cable - $4.49

https://cryptomined.com/index.php?main_page=product_info&cPath=253_238&products_id=223&zenid=0aevccs5ta57i1qpoklppi07h3

BLACKOCTANE 8-GPU STACKABLE ALUMINUM RIG FRAME including fans - $203.00

https://cryptomined.com/index.php?main_page=product_info&cPath=245_262&products_id=252&zenid=0aevccs5ta57i1qpoklppi07h3

Cost excluding GPU's- $1084.99

8x Asus GeForce GTX 1070 Dual OC 8GB Video Card - $549.00 ea

http://www.umart.com.au/newsite/goods.php?id=35880

Total cost = $5476.99

Estimated daily rate: 0.01760352 BTC

Estimated daily power consumption ($0.18/kW): $5.62

Estimated daily return @ $3500AUD/BTC: $54.23

Estimated weekly return: $379.61

ROI: 101 days