I've recently been running SH4 with 2 ATI Radeon 1800 Cards in SLI mode. During gameplay over time the graphics slowly become corrupted. At first simple menu options vanish then the Navigation Map goes black during night-time and an hour into the game and sections of the 3D environment become pretty rainbow fragments

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Has anyone else had problems like this running in SLI mode? Just wondering if its another SH4 bug or general problems running 3D games in SLI mode.
I have updated my Catalyst driver to the latest version (as of 28th March 07)