535 series 240 GB slower speed compared to intel advertise specifications ? a new VW case ?

Hello,

I test/benchmark my SSD with AS SSD , UserBenchMark and CrystalDiskMark. In all cases my sequential write speed is about 240 MB/s, insted of 490 as advertised by Intel.

Firmware is RG21, SSD is connected to a intel 6GB/s SATA port as AHCI in Windows 7 64b.

Am i doing smtg wrong or intel has same marketingo as VW ?

Thanks