HEXUS.net has posted an article on the BTX formfactor

As an owner of one of Shuttle's devices, I was hoping that the newcomer could take a high-end graphics card. Sadly, though, the answer was no. The SB86i is aimed at the business market and fitting such a card wasn't thought to be a good idea at all.

And that, I fear, will be same with most SFF BTX models. Your average graphics card is no problem but these tiny boxes can't take the sorts of card that gamers want to use. Their low-noise fans simply can't deal with the heat, and there's no obvious way of getting sufficient air throughput to prevent things starting cooking.

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