Add in revised firmware and other minor improvements, and Samsung claims that the SSD 970 EVO Plus improves sequential-read performance by increasing it to the current PCIe NVMe limit, and improves the ability to write random bits of data (such as when you're booting up your PC) by 57 percent. Instead of the 64 layers of V-NAND in the SSD 970 EVO, the SSD 970 EVO Plus makes use of 96 layers. The main difference is increased density, in terms of layers comprising the memory modules.

The new drive uses an improved version of Samsung's memory cell technology, called V-NAND. With the SSD 970 EVO Plus, Samsung set out to address the disparity between sequential reads and writes. Most are slower at writing data, an imbalance you won't notice in everyday use except in edge cases, but that definitely sticks out on a spec sheet. Samsung's existing SSD 970 EVO and SSD 970 Pro drives-as well as competing SSDs from Toshiba, Western Digital, and other companies-come close to this theoretical PCIe maximum speed, but only when they're reading data in sequential blocks (which can happen when you're accessing a single large data or video file, for example). How much speedier is PCIe? The current PCIe NVMe generation offers theoretical maximum speeds of around 3,500MBps, compared with just 600MBps for the SATA interface. (See our guide to the best PCI Express NVMe drives.) The SSD 970 EVO Plus is one of these PCIe drives, making use of the NVMe transfer protocol to supercharge speeds. Besides taking up less space, many M.2 drives also push data over the PCI Express (PCIe) bus, which is much speedier than the older SATA interface that almost all 2.5-inch drives use. M.2 offers several advantages over 2.5-inch drives. While the 2.5-inch-size drives, which connect via the Serial ATA (SATA) interface and bus, are compatible with virtually any motherboard, the M.2 size resembles a stick of gum and requires a special slot found on newer motherboards.

Samsung's various EVO and Pro drives are available in 2.5-inch or M.2 form factors, depending on the model.

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