They need to be identical to SLi them and I don't think there would be much performance gain over a single dual-output card driving two monitors but set to single-display performance mode, just more heat.
FatherJack wrote:I don't think there would be much performance gain over a single dual-output card driving two monitors but set to single-display performance mode, just more heat.
is true, but it may well be worth a shot on older cards.