Samsung on Tuesday unveiled its new 860 Evo and 860 Pro SSDs, the Korean tech giant’s latest efforts to quench the thirst of PC builders for ever-higher data throughput speeds.

Scheduled to be available for purchase by the end of the month, the 860 Evo offers a maximum sequential read speed of 550 MBps, a slight bump over the 850 Evo’s 540MB/s read speed, thanks to in part an improved controller that handles communication with the host system.

The slight speedup is also thanks to the latest V-NAND technology, which rearranges the flash memory cells in vertical stacks instead of horizontal ones to boost their speed and longevity and reduce their power consumption. Samsung’s 850 Evo was the first drive to feature this new cell arrangement when it debuted in 2015.

The latest revision of V-NAND architecture used in the 860 Evo enables the drive to transfer data at speeds that approach the 600MBps limit of the SATA interface. In addition to the 2.5-inch SATA form factor, the 860 Evo is also available in mSATA and M.2 varieties. The 860 Pro, meanwhile, is available only in a 2.5-inch form factor and offers a slightly higher maximum read speed of 560 MBps.

Random read and write performance, which impacts things like operating system boot times, has also increased slightly from the 850 series, especially at lower queue depths, according to Samsung’s internal testing.

The 860 Evo comes in 250GB, 500GB, 1TB, 2TB, and 4TB capacities, starting at $94.99, while the 860 Pro has 256GB, 512GB, 1TB, 2TB, and 4TB versions starting at $139.99 and topping out at $1,899. Check the pricing chart below for more details.

Other than slightly faster data throughput capabilities, perhaps the most unique part of the 860 Pro is its warranty. It’s rare to see a hard drive with a warranty that’s greater than three years, but Samsung says it’s confident enough to guarantee the 860 Pro will work for five years or up to 4,800TB of data written for the 4TB version.

System builders have been eagerly anticipating the rumored successor to the 850 Evo, and their anticipation reached a fever pitch last week when a listing for the 860 Evo was mistakenly added to Samsung’s website. It was pulled a few hours later.

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