AIDA64 Random Access Time
AIDA64 offers several different benchmarks for testing and optimizing your system or network. The Random Access test is one of very few if not only that will measure hard drives random access times in hundredths of milliseconds as oppose to tens of milliseconds.
Drives with only one or two tests displayed in the write test mean that they have failed the test and their Maximum and possibly their Average Scores were very high after the cached fills. This usually happens only with controllers manufactured by JMicron and Toshiba.
Marketing folks like to talk about big flashy numbers, so we hear quite a bit about ATTO performance and transfer rates, but SSD's real standout feature is access times. Access times are measured in milliseconds and the lower the access time, the better the user experience is.
The Vertex 3 Max IOPS 240GB has a read access time of .18ms on average. It doesn't sound as cool as 550MB/s, but .18 will make your programs open faster than you can even remove your finger off of the mouse button.
The Vertex 3 Max IOPS write access time went up a little over the Vertex 3, but there have been a couple of firmware updates and that might be playing a little role in the difference. Still, you aren't going to notice the slightly elevated access times.