The SSD Review published a review on the Samsung 840 EVO SSD
A quote from the article:
Our SSD analysis today is perhaps the most detailed typical SSD report we have published to date, and so it should be. Actually, the word typical doesn't quite fit as the Samsung 840 EVO SSD, that I am now using as my mainstream system drive, is pushing over 1GB/s sequential speeds and an unbelievable 685MB/s low 4K random write performance. If you think this might be magic, you would be right and this magic is within the reach of every Samsung 840 EVO purchase, performance not even closely matched prior to this release.Samsung 840 EVO SSD Review @ SSD Review