The Vertex 4 does no longer suffer of any compression-related limitations and was built to produce higher IOps (Vertex 3 was rated at 60K 4K IOps and Vertex 4 at 85K 4K IOps).
When we ran more recent benchmarks which use compressed data, the Vertex 4 exceeded the performances of the Vertex 3 240GB, mostly when writing data.
OCZ has optimized the firmware for the Vertex 4, so the SSD behaves differently depending on how much space is filled on the drive. If the drive is half-full, we will enjoy optimized performance and after crossing more than half full, the garbage collection algorithm will re-optimize the drive for maximum efficiency based on a larger data footprint.
The OCZ Vertex 4 128GB is recommended for High End systems.
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