The Barracuda Green 2TB is an attempt by Seagate to crack the low power consumption and excellent acoustics of low power desktop drives from WD and Samsung. The Momentus 750GB on the other hand doesn't have much to prove, coming from the same stock as the surprisingly quiet Momentus 7200.4 and XT.
You do software updates to get the most from favourite programs right? Updating a motherboard BIOS can in a timely manner is also critical. The guide to Flashing a Motherboard BIOS spells out the often complicated steps in plain english. PCSTATS Tips