[mythtv-users] PCI capture cards on Intel Sandy Bridge

[Calvin Harrigan]

On 4/2/2012 11:19 AM, Raymond Wagner wrote:
> On 4/2/2012 11:06, Mike Perkins wrote:
>> three feet and fifteen feet! Some mistake, surely?
>
> It says it connects through USB, and the length limit of USB is 16 feet,
> however the concept of pushing PCI over USB is itself pretty absurd.
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Might not be the best match, but not absurd. PCI theoretically maxes out 
at 132MB/sec (32 bits <4 bytes> x 33 Mhz).  USB 2.0 is 480 Mb/sec  So 
forgetting about overhead etc., that's about 60 MB/s (480/8). Low, but 
not too bad either.  There will be other issues, like latency, high cpu 
overhead, port read/write timings, memory mapping, etc, but still doable 
in most cases.  I definitely wouldn't put it into a production 
environment.  :-D