[Amazon.ca] Crucial MX500 500GB SATA 2.5 Inch Internal SSD $87 Free shipping
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This one, contrary to the 1TB WD Green of earlier today, has DRAM and much better performance.
Another advantage of the MX500 series is the Integrated Power Loss Immunity that preserves your data if the power unexpectedly gets cut.
From this reddit thread:
"They have [large capacitors] on board, and in the NAND chips themselves, so that the SSD has time to detect that voltage to it is falling, write whatever it is in the middle of writing, and shut down, with no corruption resulting. Whereas, other SSDs (and HDDs) will do who-knows-what, and then try to roll their state back by some amount of seconds, instead. They all try to prevent the worst problems, but many of them just up and stop doing anything, then pick up the pieces on the next startup, rolling back to previous state."