1.8V of voltage of DDR2 memory acquiesce compares the 2.5V of DDR400, low on 40 ％ , but frequency is climbed however rose 100 ％ , DDR2 has stronger latent capacity exceeding frequency apparently, from at present each memory of big forum exceeds the whole world frequency circumstance looks, DDR2 memory should be done only better come loose simply hot measure (affix memory carbon fin for example) , 2.2V job voltage can acquire satisfactory and safe property exceeding frequency. A pair of DDR2 memory that can move in 800Mhz are enough and current AM2 and Conroe are used.