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This chart clearly shows how beautifully the RAID arrays scale when drives are added. However, the throughput stops increasing as you reach 5 hard drives in RAID 0. Obviously, some component of our test system - either the RAID controller or the motherboard - created a bottleneck for our 6, 7 and 8 drive arrays. In theory, the PCI Express x4 interface should be capable of transporting 1 GB/s.
Write transfer rate is clearly below the maximum results of the read transfer rates test. Obviously, this controller cannot handle write speeds higher than 275 MB/s.