$60 H310 mini-ITX board on DDR3 works with Skylake through Coffee Lake S : r/sffpc
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Asustek's Intel Z170 platforms will work with DDR3 1.5V/1.65V modules | KitGuru
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GIGABYTE X170-Extreme ECC Conclusion - The GIGABYTE X170-Extreme ECC Motherboard Review: For When Skylake Xeons need SLI and Thunderbolt 3
ASRock Unveils First LGA 1151 Socketed Motherboard Featuring Support For 6th Generation Skylake Processors
LV-67T-G - Mini-ITX Embedded Motherboard - Global American
Intel: Usage of DDR3 at default voltages can damage “Skylake” | KitGuru