The firmware for correcting the read performance of the 840 Evo is already available. However, the firmware must upgrade through the Samsung SSD 840 EVO Performance Restoration Software. Which only works for a NTFS partition under Windows. My Evo is for OSX only, so doesn't work. Have to wait until the end of the month. If anyone have a 840 Evo for bootcamp, it should work, and you may upgrade the firmware now.