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sapphire display port adapter

Why is it USB powered? There are (much cheaper) DP to DVI adapters out there that don't use USB power, why would a video signal need power anyway?

:confused:
 
But WHY does eyefinity need active display port adapters? What can it possibly be sending down the cable that needs power?

Given that it can run the other two (DVI + DVI or DVI + HDMI) without power?

EDIT: Ah, it's not an adapter, its a converter, and as such needs power to convert the signal. Dodgy naming of components FTL.
 
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Lots of discussion around this forum and at WSGF about this adapter and similar ones - an important read if ur considering Eyefinity (and dont have at least one DP monitor).
 
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