Galaxy is developing a new NVIDIA graphics card with support for six displays. It's unknown which GPU this card will use, the PCB looks the same as the one the company used for its GeForce GTX 460 WHDI but it features a small daughterboard which is connected to another small card which in turn is attached to a mini PCI Express slot on the main PCB. Thanks to these extra components, the card offers dual-link DVI, a full-size DisplayPort and four mini-HDMI connectors.
One problem is that a custom solution like this isn't going to be cheap either and Galaxy's WHDI card is a very expensive solution, although this shouldn't be anywhere nearly as expensive as it doesn't have a transmitter or receiver. That said, there might be some potential niche markets for a card like this, especially as it uses four mini HDMI ports which makes it easy to connect to many different display types without any special cabling, not counting the fact that you need a mini HDMI to HDMI cable or adapter.