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The 9503-DG5 model had a native refresh rate of 48 Hz and did not come with a graphics card but included an external converter box that takes a dual-link DVI signal and splits it into two single-link signals - one carrying odd pixels and the other even pixels. Using just the dual-link DVI interface through the converter box allows a refresh rate of 24 Hz or 25 Hz. When this converter box is used with a third single-link DVI input a refresh rate of 48 Hz can be achieved. In this mode the dual-link DVI drives the left 2624×2400 portion of the screen and the single-link DVI drives the remaining 1216×2400 portion. Alternatively, two converter boxes can be used simultaneously with two dual-link DVI ports to drive the DG5 as two 1920×2400 stripes at 48 Hz. For video cards with only three TMDS channels (such as most cards based on NVIDIA Quadro FX 3000 or NVIDIA GeForce 6) the converter box is needed to get the maximum refresh rate. With four TMDS links, the monitor can be driven at maximum refresh rate at any resolution using four 1920×1200 tiles. The converter box does not work with earlier revisions of the monitor. Driving the monitor with four DVI cables requires a sufficiently powerful graphics card, for example the Matrox Parhelia HR256.[3] The uncommon resolution, connection and screen splitting may require custom settings for systems not officially supported.[citation need