Which Intel SSD (Series) is the best? 520, 320, 510, 710, etc. and their uses? Also, why is the 520 cheaper than the slower 320?
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The 510 is regarded as the best in speed and reliability. All Intel SSDs are rated highly for reliability. The 520 is a SATA III compared to the SATA II 320. It is probably cheaper because of economies of scale in production.
It is almost half as much in price. (The 520 and the 320)