4 KB Random Performance
Random Read Performance (background info)
At a queue depth of one, all of the SSDs in our comparison move between 25-30 MB/s. As we scale up to 32 outstanding I/O requests, the 256 GB Vector leads the pack, delivering ~390 MB/s (or roughly 100 000 IOPS). That's roughly 15% faster than the Vertex 4, and 10% faster than Samsung's 840 Pro. In between, though, the Vector trails both the Vertex 4 and the 840 Pro.
In an effort to minimize the redundancy of including multiple SandForce-based drives in our charts, we're using Intel's SSD 520 to represent the other drives out there with an SF-22xx controller and synchronous NAND. Compared to those SSDs, the new Vector represents a major improvement at queue depths of eight and higher.
Random Write Performance
Between a queue depth of one and four, the Vector manages a measurable lead over the Intel SSD 520 standing in for second-gen SandForce drives with synchronous NAND in 4 KB random writes. Whereas most SSDs start at around ~50 MB/s, OCZ's newest SSD leads off at ~80 MB/s.
Beyond a queue depth of four, the Vector falls behind the Vertex 4 and 840 Pro, but then spikes at a queue depth of 32.
Although the Vertex 4 does really well at high queue depths, it's not as compelling in this test where we'd want it to be (at lower queue depths more representative of desktop workloads). To that end, the Vector again impresses.