IMac 24 and 27 Cinema Display as second monitor

Got older 24 iMac with mini DVI output for external monitor (ATI Radeon HD 2600 Pro 256 MB graphics)
Bought 27 Cinema display to use as 2nd monitor.
Bought Atlona DP400 to convert signal.
Connected everything and only resolution I get on 27 Cinema display is 1280 x 720, which is frustrating.
Is there any way to set higher resolution for external monitor? Scaled shows only 800 x 600 and 1280 x 720 (as best for display)
Thank you for help!

If you mean those older Cinema Displays with the Apple Display Connector (ADC), then you need a mini-DisplayPort to DVI adapter and the DVI to ADC convertor sold by Apple or others (expensive). I bought Apple's DVI to ADC box last year and use it to add the 23" Cinema Display HD to a Powerbook G4. Works great.
I haven't bought a mini-DisplayPort to DVI adapter/cable to use the ADC display off my iMac, because I don't have the desk space for two large monitors and two large printers.

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