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Anandtech posted a review on the Crucial v4 (256GB) SSD



The biggest reason why SSDs have not become truly mainstream (yet) is price. While prices have come down significantly over the last year, you are are still paying roughly $0.75 per GB, whereas hard drives can usually bought for less than $0.10 per GB. For an enthusiast, it shouldn’t be a problem to pay up to ten times more per GB if it yields significantly better performance, but the consumer market is much harder to convince. Most aren’t ready spend hundreds of dollars on a single component, especially if there is a cheaper alternative that is sufficient. In this case, hard drives also offer more capacity, which can make it very hard for consumers to understand the benefits of an SSD.

Besides price, there is another problem. Most SSDs sold today are SATA 6Gbps but the vast majority of computers are only compatible with older and slower SATA 1.5Gbps and 3Gbps standards. That means consumers who don’t have a SATA 6Gbps compatible computer will not be able to take advantage of the extra IO bandwidth that the SATA 6Gbps SSDs offer, and it may feel pointless to pay for something you can’t use. Of course, there are previous generation SSDs that are SATA 3Gbps but they aren’t necessarily cheaper due to the use of more expensive NAND (2Xnm vs 3Xnm).
  Crucial v4 (256GB) Review