[mythtv-users] Video Memory -- How Much?

Patrick Ouellette pat at flying-gecko.net
Thu Oct 19 15:35:54 UTC 2006

On Wed, Oct 18, 2006 at 02:12:34PM -0700, Jon Boehm wrote:
> Yes, one of the key differences between the 5200 and the 6200 is that the
> 6200 can do dual link DVI.  But which mem size?

You can do the math yourself:

1920 x 1080 = 2073600 pixels

24 bits per pixel = 3 bytes per pixel

so 2073600 x 3 = 6220800 bytes per screen

You want to double buffer so you have 2 screens

6220800 x 2 = 12441600 bytes

12441600 / 1024 = 12150 kbytes

12150 / 1024 = 11.87 Mbytes

So pretty much any card with more than 12MB of memory could
theoretically support a double buffered 1080p display.  What else the
driver uses memory for (scratch areas, other surface rendering,
viewports, whatever) isn't accounted for, but most any new card on
the market today should work since they pretty much all have more 
than 12MB of memory.



Patrick Ouellette                 pat at flying-gecko.net
kb8pym at arrl.net                   Amateur Radio: KB8PYM 
Living life to a Jimmy Buffett soundtrack
"Crank the amp to 11, this needs more cowbell - and a llama wouldn't hurt either"

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