My machine with Dual DVI ports is currently being used by my wife I'm gonna have to pick my moment to switch the monitors over. I could run it on my laptop if I had a displayport cable INSTEAD OF THIS SECOND USELESS DVI-D CABLE!!
FWIW as I thought I'd just give it a go, I plugged it into my laptop using the VGA cable, and it works at 2560x1440
we shall not be repeating this price again!