hmmm... i have a cusl2, but i never lose agp4x. how exactly do you lose it? i hate to tell you this, but the mushkin pc150 does 150 cas2-3-2, so it's probable that it will only do 168 at cas3-3-3. if that happens, all you've managed to do is waste your money, since you will not see much improvement. the mushkin rev2 is better than the pc150. it hits ~155mhz at cas2-2-2.