I hadn't seen the thread (thanks for that), but know of him and his website. I read it every now and then. Back when I designed my system I found it quite inspiring.

The main issue could be driver and application related, that is why I asked the question. I know the hardware tricks, and for NVidia I also know the software side (been there done that), but I have no experience with ATI cards.

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Team Bletchley Park.