Memory problem with my V2 SLI?

[jplee]

Hi,
Recently I use 2 Mostoer 3d II 12mb in SLI to play Diablo II and run in to a problem; After Runing game normaly for certain length of time,the screen suddenly become blur and dim. If look in to the game graph closely, I can see horizontal lines within although it's very tiny. Once  I exit game and re-enter in, everything then back to normal.
I don't recall exactly after how long I play then it happen, but I run in to it from time to time. So, is it one of V2 cards has problem? or it just normal...though I doubt it....    
I need suggestions, Thank you very much!

jplee

[ps47]

make sure you enable v-sync.use leinen tweaker.

[jplee]

Thanks!