Folks;
My thanks for all of the advice. I suspect that I'll be off today to source some cables.
The 3070 has what appear to be 2 x HDMI and 2 x Display Ports. And yes, I can get 1440 out of just one when using the DVI cable. The monitors appear to have one each of DVI, HDMI, and Display Port. I'll pick up some 4K supported DP to DP cables and let you know how I go.
Leo - as of Windows 8? Half your luck! I maxed out at XP.
I'll update with results in a day or so. Cheers!