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In reference to the Engadget video can someone please explain to me why you need $100 dvi dual link display adapters to set up external monitors on the new iMac. Wouldn't standard $30 mini display port to divi/vga cables work to set up multiple monitors? Please help I am really confused..

http://www.engadget.com/2011/05/03/apple-imac-hands-on-with-dual-30-inch-displays-video/

Only Dual link DVI can output 2560x1600 resolution. With a single DVI link, the highest supported standard resolution is 2.75 megapixels (including blanking interval) at 60 Hz refresh. 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).
 
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If you got a 1080p monitor you want to connect. Its no problem.

Then the adapters for 30 bucks works great. Hower all the mini dp/thunderbolt port to hdmi, dvi etc. Cant handle 2560x1600 on those dell monitors. The cheap adapters is limited to 1080p
 
Dual-link DVI is required for 2560x1600 resolution. Another option would be to use mDP to DP adapter but especially older monitors do not have DP.
 
thanks for your help, I do appreciate it...

so whats the maximum amount of monitors i can hook up with a regular minidisplayport to dvi cable?
 
Limit of one mDP to DVI adapter per port.

Otherwise, DP can support multiple monitors per port, depending on hardware/software configuration.
 
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