It'susually fine to overclock a video card to get some extra performance but when you look at what you get for that extra performance it's not worth trying to get the maximum ovrclock. To get an extra 5 fpsd is not going to make the ame look any better and when you tr to do a maximum overclock you are risking the life of the part your overclocking. If your able to overclock the video cad to a stable clock and you run into problems when you go further then you should stop and be satisfied with what you have.
hmm, thankx for you answer and man 24GB RAM! (0.O)
if i'm not wrong. you'r one of Guru3D winners?