I know the Caviar Black hard drives are better and a little faster, but I am saving $60 on the Caviar Blue hard drives. I plan on using them in a Raid 1 for redundant storage to compliment my SSD. My current 1333 RAM is from a previous build and this 1600 RAM would be my upgrade since they finally went on sale for $20 off. Both items also have free shipping if anyone else is intrested. Both items seem like good deals.