Can Dual Link DVI do 4K at 60Hz?

I've got a 4K monitor attached via Dual Link DVI. It does 4K, but only at 30Hz.

It does 60 Hz up to 2560x1440; anything above that is 30Hz.

Is that a limitation of DVI?

A single dual-link DVI connection can deliver up to 2560 × 1600 at 60 Hz. Achieving 4K at 60Hz requires two dual-link DVI cables, or DisplayPort 1.2 or HDMI 2.0.

So, yes, as you put it, that's a limitation of DVI.

No, this is beyond DVI spec and I haven't been able to successfully force it.

You can, however, achieve 2K (2560x1440) @60Hz over a single dual-link DVI cable, and you can achieve 4K (3840x2160) @30Hz over a single dual-link DVI cable.

I have successfully tested this on a Geforce GT 730 connected to an Asus MG28UQ 4K monitor with a DVI-to-HDMI adapter cable.