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Interview with David Nalasco

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Bona Fide

2[H]4U
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Aug 26, 2005
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Good stuff [sorry if this is a repost].

http://www.tbreak.com/reviews/article.php?id=408

Why is the current X850 CrossFire limited to 1600x1200 resolution at low refresh rates- would a better chip used for compositing engine helped?

The limitation is due to the DVI link because DVI has a certain amount of bandwidth which is at 165MHz x 8-bit. There’s a certain amount of bandwidth there and we wanna use that bandwidth to communicate between the two cards. (Since) one card is not opened for display so we can use all of that bandwidth dedicated to pair those (cards).

The actual speed of the PCI Express bus is faster but first of all, that’s peak speed. Real, actual usable bandwidth is less and its also being shared for communication with the chip. Those were our two options (and) we actually got more bandwidth by dedicating a DVI link but (again) the DVI link has a limited amount of bandwidth to those certain resolutions regardless of what compositing engine we would’ve put on the master card to get the data to the slave card at a certain rate so that’s where the resolution limitiation (kicks in).
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