PRELUDE: FSX can be run in DX9 and DX10 mode. In both cases there is a setting for water. 1xlow med or high. 1x is 1 pass shader. 2xlow, med and high. 2X is for 2 pass shader to provide reflection.
NOTE: issue is tested by several users and is repeatable. Issue did not happen in driver version 12.4
With the release of the DX10 Fixer http://airdailyx.blogspot.ca/2013/09/steves-dx10sceneryfixer-released.html
The developer of FSX DX10 Fixer tool has sold thousands of copies in 3 months and still selling. FSX users are moving to DX10 in droves.
PROBLEM....Running FSX in DX10 has become the new standard for a huge chunk of the flightsim community. For AMD users, there is a bug concerning water shader at water settings above 2xLOW in game menu. If water is set to higher than 2xLOW (To get additional reflections on water surface) in FSX settings when running FSX in DX10 mode, you get huge corrupt scenery spikes in minutes. Alot of AMD customers are moving to nVidia and taking other AMD customers with them.
The dev tested this issue. Steven discovered that it is truly linked to the water setting. It is immediately repeatable. It does NOT occur on driver version 12.4 But any 13.X drivers it does.
Thank you and I hope it can be solved in a new driver soon.