Graphics card for dual 2560 x 1440 output

Solution 1:

You just need a video card that has two dual-link DVI ports.

The Geforce 600 series supports "4 independent 2D displays, or 3 stereoscopic/3D displays (NV Surround)"

AMD cards with eyeinfinity that have two dual-link DVI ports should also support this.

Here is an example of a card that has two dual-link dvi cables. This is not an endorsement of this product or a recommendation to buy. Just shop and look for a card that has two dual link DVI ports should be all you need.

It is possible to make a displayport connector into a dual-link dvi cable however that seems more expensive with adapters currently ranging in price from 60-$100

You could also opt for displays that support displayport 1.2 and a video card with that port as well.

"For example, a DP 1.2-enabled notebook will be able to drive two WQXGA (2560×1600) monitors or four WUXGA (1920×1200) units over a single connector, with each display acting as an independent screen with different resolution and timings at full uncompressed pixel performance with HDCP copy protection."