What are your settings? Perhaps you are OCing the RAM? Remember, since all data to/from RAM has to go through the FSB, don't bother setting the memory bus throughput higher than the FSB throughput. Just take the FSB throughput (for example, 1066MHz), divide by 2 (for dual-channel mode), and that gives your the proper memory bus speed (i.e. DDR2-533 in our example). For running a 1333MHz FSB, proper memory bus speed is DDR2-667.