**here's the problem...**

I am looking at some SSDs benchmarks, but when comparing I didn't understand some benchmarks on tom's hardware and on passmark. Why is the Vertex 4 behind the other two drives but has more iops and w/r speed?

```
SSD OCZ Vertex 4 128GB 2.5" 2,666
SSD Corsair Force GT 120GB 2.5" 2,869
SSD OCZ Vertex 3 120GB 2.5" 2,798
```

IOPS

```
SSD OCZ Vertex 4 128GB 2.5" R4kW 85000 M 120000
SSD Corsair Force GT 120GB 2.5" R4kW ? M 85000
SSD OCZ Vertex 3 120GB 2.5" R4kW 60000 M 85000
```

Can somebody explain how those differences come up?