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Date: Mon, 16 Nov 2009 08:09:36 -0600
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From: Jason Harmening <jason.harmening@gmail.com>
To: bruce@freebsd.zuhause.org
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Cc: freebsd-multimedia@freebsd.org
Subject: Re: Are the cx88 drivers supported on the AMD-64 platform?
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> Can I use a Hauppauge 1800 on a system running on amd-64 with more than
> 4 GB memory, or do I need to run in i386 mode?

Yes.  The 1800 has a 64-bit DMA engine, so it can be used with > 4GB
with no performance penalty.
The older 32-bit cx88 cards are also supported on large-memory
machines, but their DMA routines may use double-buffering.