I would not be 100% certain of this.
The DVI portion of DisplayPort is a backwards compatible piece...pure DVI.
Displayport uses a completely different timing method.
The DVI is simply "passed through" much like the analog VGA is through a DVI port, a totally separate entity.
These were things I discovered while making eyefinity work on 5870.
The sort of adapter that Peloche is using is called "passive" as it does not modify signal at all.
Here is a cheap one in US:
http://www.monoprice.com/products/p...=10428&cs_id=1042801&p_id=4827&seq=1&format=2
And here is their explanation of what I am trying to say....near bottom of page:
"Note: This is a passive adapter. While DisplayPort connectors are capable of passing a DVI signal, DisplayPort and DVI signals are basically different and not compatible with each other. This adapter does not actively convert a DisplayPort signal into a DVI signal. In order for this adapter to function properly, you must have a DisplayPort source device capable of producing and passing out a DVI signal through the DisplayPort jack. "