artifacts usually develop fairly early so it depends on how thourough you want to be. i usually go for about 2-3 mins to check max overclock and about 10-30 mins to test stability. or you can always play some f.e.a.r.
All I did was added AS5 to the cards. Stock heatsink/fans. I'm going to be modding the side panel for a fan or 2 to get better temps on the sli setup...the top card gets a bit warmer than the bottom one does.
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