6600k, 6700k which mobo's support both ddr3 and ddr4 with these cpu's?

[Skipping-Bear]

if i upgrade from my current cpu i would like to use my ddr3 until i can upgrade to ddr4 and dont know which mobos support both

 

[faalin]

Here are your only 3 options that support the 1151 socket and have ddr3 http://www.newegg.com/Product/ProductList.aspx?Submit=Property&Subcategory=280&N=100007627%20600567554%20600036384%20600036400%20600036387%20600036392%20600036385%20600165298&IsNodeId=1&IsPowerSearch=1 There is no motherboard right now that supports ddr3 and 4 together.

 

[g1abhi]

Asrock combo motherboards will come out , which will support ddr3 and ddr4.
But on a side note , Intel is is not officially supporting usage of ddr3 and point out that using ddr3 which uses around 1.5v will damage the cpu in the long run. So its not really thumbs up for ddr3 from intel. You are better off buying new ddr4 and selling your ddr3 , especially if you plan to use integrated graphics, which is less likely.