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The 1080ti requires about a 600~650w power supply. At 650w all the power supplys are around $100 so I suggest this Antec 850W that should handle 2 in SLI.
http://www.guru3d.com/articles-pages/geforce-gtx-1080-ti-review,7.html

PCPartPicker part list / Price breakdown by merchant

Power Supply: Antec - HCG M 850W 80+ Bronze Certified Semi-Modular ATX Power Supply ($98.99 @ SuperBiiz)
Total: $98.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-08-29 01:35 EDT-0400
The 1080ti requires about a 600~650w power supply. At 650w all the power supplys are around $100 so I suggest this Antec 850W that should handle 2 in SLI.
http://www.guru3d.com/articles-pages/geforce-gtx-1080-ti-review,7.html

PCPartPicker part list / Price breakdown by merchant

Power Supply: Antec - HCG M 850W 80+ Bronze Certified Semi-Modular ATX Power Supply ($98.99 @ SuperBiiz)
Total: $98.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-08-29 01:35 EDT-0400
 
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