I can go to 400/425, without any problems. I have the Abit mx440. I had an old fan from a Pentium133 CPU, it is about the same size as the heatsink on my card, which i attached, it makes no difference to the ram speed as it's only cooling the core, but it's doing something because the best core speed i could go to without the fan was 300. So even basic cooling methods help quite a bit. By the way, for people who say this card is crap, who cares, getting the most out of what you have was original concept of this thread... peasant power.