Complex sentence: A test with DDR and DDR2 RAM in 2005 found that average power consumption appeared to be of the order of 1-3W per 512MB module; this increases with clock rate, and when in use rather than idling.
Split into simpler sentences: A test with DDR and DDR2 RAM in 2005 found that average power consumption appeared to be of the order of 1-3W per 512MB module. Increases with clock rate, and when in use rather than idling.