Corsair has announced its latest in the Extreme Series of solid state drives with the addition of the X256 256GB model. Built using Samsung MLC NAND flash memory and equipped with the Indilinx Barefoot controller, the unit promises maximum sustained read/write speeds of 240MB/s and 170MB/s respectively. The X256 joins existing 32-, 64- and 128GB models already in the line up and features upgradable firmware which will allow users to take advantage of the TRIM function in Window 7 when it is released, an important feature for helping ensure optimal performance of the SSD over time. The X256 is currently available and you can find it online for under $700US.