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The sequential write speed performance hit you will see on a Sandforce drive with incompressible data compared to a non-Sandforce drive also depends on the storage capacity of the drives. But for example an Intel 330 60GB will do around 80MB/sec sequential with incompressible data and a Samsung 830 64GB will do around 160MB/sec sequential no matter if the data is compressible or not.
For more Sandforce incompressible data write speed examples for different capacity drives, scroll down on this page: Tom's Hardware US
Ah thanks, nice one.