The (or an) adapter you are looking for is called PowerColor HDMI Adapter WA-G247, maybe that helps in the search for a distributor in the uk. And yes, it seems the Audio signal is only transmittable via the special ATi adapter.
Here are two lists of passive HD3450 models: PCIe 256MB Preisvergleich bei Geizhals.at sterreich , PCIe 512MB+ Preisvergleich bei Geizhals.at sterreich
As far as I know all Radeon HD models have an integrated Audiocontroller to transmit Audio via DVI/HDMI (certainly all Radeon HD 3450 models). There is no such thing as an "integrated HDMI output" since DVI video output is fully compatible with HDMI video output.
I don't know anything about handshaking issues though.
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Last edited by Spooky; 2008-04-15 at 18:36.
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