I think you bring a very good point to the surface.
I stress and stress every clock and at times even the ones that pass 24 test still fail on a few WCG units or my rig overheats. Some like to avoid work units that give errors but to me that just tells me my rig just isn't 100%.
I am doing this now. The 1055t and the I7930 haven't done a full 24h test the lower clocks have but the new ones no not at this time.
Has anyone seen a thieving gremlin? Seriously, it comes in the night and steals my OC stability. Kiex