Bug only on GPU with chip G92, rev: A2

Hello all,

So recently we have problem with our cascade shadow.
On certain place it will have some hole / line edge.
After debugging through Pix, we have hard time figuring out what is the problem on draw call.
(Gap where the hole appear happened on edge where it’s vertices shared).

So this is where the strange things happened: the same Pix shared across different cards and problem never appear on some of graphics. So far we detect this on 9800 GT, 250 GTS.
Some picture to show the problem:
http://www.flickr.com/photos/92950560@N02/8450441612/
Anyone have same problem before?

Cheers,
Randy