What ^he^ said. In my experience, most users on a daily basis benefit far and away by IOPS. How often do you really transfer large gigabyte sized files anyway, right?
Conversely, how often do you transfer thousands of 4K files???RE thread title / OP: First thing to realize
is that all SSD manufacturers rate their read/write speeds based on Atto benchmark best transfer rate. However Atto has no bearing upon real-world performance. This is why Vertex 3 can show numbers like 500/550MB/sec while the Vertex 4 only shows 475/535MB/sec. Yet in real-world performance, the Vertex 4 (since firmware version 1.4 - currently at 1.5 which has been included on new drives for several months)
is up to 30% faster, Crystal Disk Mark & AS-SSD are both much better at corelating an artificial benchmark data into real-world performance numbers. Second thing to realize
is that IOPS doesn't mean much for the average user either. Most mechanical hard drives can't even touch 1,000 IOPS, yet for 99% of home users, mechanical drives provide more IOPS than they can ever use. IOPS is usefull mainly for large servers where multiple requests for data may occur simultaneously.
The only useful metric in determining SSD performance is online reviews from trusted sources.
Beyond that, you have to look more deeply into the details of each SSD, stuff like, what controller does it use, what brand of NAND is used, what type of NAND is used (Toggle, Asynchronous, Synchronous, etc...), SLC, MLC, or TLC, speed of the NAND, etc... etc... etc...