IOMeter is another open source synthetic benchmarking tool which is able to simulate the various loads placed on hard drive and solid state drive technology.
We test with both random read and write 4k tests, as shown above. There are many ways to measure the IOPS performance of a Solid State Drive, so our results will often vary between the manufacturer’s quoted ratings.
As you can see, the SanDisk Extreme 900 480GB was able to deliver some consistent read and write speeds during this test.
..Or just get the StarTech.com USB 3.1 (10Gbps) Gen2 enclosure for £20 @ Amazon and stick a Toshiba Q300 480GB SSD in there and save yourself £120 with similar performance.
Enclosure: http://www.amazon.co.uk/gp/product/B00XLB0NWK
SSD: http://www.amazon.co.uk/Toshiba-480GB-Solid-State-Drive/dp/B011MFGU7S