It's difficult to thrive in the solid-state drive world. Unless you've got just the right controller and flash memory, most performance-minded PC users will rarely give you a second glance. Samsung muscled its way into that narrow view with the SSD 830 last year; it intends to lock our attention with the new SSD 840 and SSD 840 Pro. The Pro's 520MB/s and 450MB/s sequential read and write speeds are only modest bumps over the 830, but they don't tell the whole story of just how fast it gets. The upgraded MDX controller boosts the random read access to a nicely rounded 100,000IOPS, and random writes have more than doubled to 78,000IOPS or 90,000IOPS, depending on who you ask and what drive you use. The improved performance in either direction is a useful boost to on-the-ground performance, as both AnandTech and Storage Review will tell you. We're waiting on details of the ordinary triple level cell-based 840 model beyond its 120GB, 250GB and 500GB capacities, although there won't be an enormous premium for the multi-level cell 840 Pro over existing drives when it arrives in mid-October -- the flagship line should start at $100 for a basic 64GB drive, and peak at $600 for the ultimate 512GB version.