The Dell SP2309W displays 2048x1152 via single-link DVI...
by stevenk583 - 6/26/10 3:14 AM
In Reply to: No by Jimmy Greystone
The Dell SP2309W User's Guide is available here:
The manual shows that the SP2309W has a single-link DVI connector, so you need a Mini DisplayPort to (single-link) DVI Adapter. That single-link adapter is _not_ limited to 1920x1200 @ 60Hz, that spec is simply given to avoid the confusion which would be caused by mentioning other less common resolutions which are also supported by single-link DVI, such as 2048x1152.
Single-link DVI can handle 2048x1152 and even a little more beyond that, as explained here:
On that Wikipedia page it says: "With a single DVI link, the largest resolution possible at 60 Hz is 2.75 megapixels (including blanking interval). For practical purposes, this allows a maximum screen resolution at 60 Hz of 1,915 1,436 pixels (standard 4:3 ratio), 1,854 1,483 pixels (5:4 ratio), or 2,098 1,311 (widescreen 16:10 ratio)."
Of course, monitors are not built with those particular resolutions, those are just the limits of what single-link DVI could carry at various aspect ratios at a 60Hz refresh rate.
That Wikipedia page regarding DVI also has pictures showing the difference between single- and dual-link DVI connectors: The single-link DVI connector omits (or simply ignores) six pins in the middle, but a dual-link DVI cable uses all available pins. A dual-link DVI connection does _not_ require two DVI cables, it simply uses six more pins inside the same DVI connector. For example, the 2560x1600 Apple 30" Display uses only one dual-link DVI port, and the "Mini DisplayPort to Dual-Link DVI Adapter" has only one DVI port.
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