What's up with the power consumption on these 512GB SSDs? Anandtech lists the 512GB Samsung 830 power consumption at idle at over 3x of the 256GB version! I want to upgrade in size (got the Apple 128GB SSD now), but not if my battery life goes to zilch. If I care about battery life, should I stick with the 256GB Samsung 830 or would the power drain be negligible to move to the 512GB Crucial M4? (I'd like the space and am willing to pay for the the M4, but if my battery life stinks or it's not a reliable as the 830, I'll stick with the smaller size until the newer manufacturing processes can make the higher capacity drives less power hungry.) Would love to hear from anyone that upgraded from a 256GB 830 to a 512GB M4 in terms of battery life and reliability. Thanks!