PCIe 5.0 has become widely accepted, and the modern, energy-saving controllers have made the cooling towers of days gone by obsolete. The SSDs with the new E28 controller - Corsair MP700 Pro XT and PNY CS3250 - are in the top group, but they cannot displace the competition with the SM2508 controller from Silicon Motion...

Most PCle 5.0 SSDs deliver impressive speeds, but not all models are in the same league. The test winner, the WD Black SN8100, sets new standards and scores top marks for read and write speed as well as programme acceleration. The Samsung 9100 Pro, which ranks second, comes closest to it...

Lexar needs to improve: The NM990 impressed in the test with top values when reading data, but fluffed when writing. The same picture with programme acceleration: top for reading, mediocre for writing. The interaction between the Maxio controller and Micron memory therefore stutters when writing data...

The NM990 from Lexar is already the second SSD tested with the Chinese SSD controller MAP1608 from Maxiotek, the flash memory bears the logo of Longsys - the actual manufacturer of the memory was initially unclear. However, the measurement results are very similar to those of the X570 from Biwin, even the speed diagrams from H2benchw are almost identical - so the flash is probably from Micron...

The Lexar NM990 2TB (LNM990X002T-RNNNG) impresses in the test with good overall performance at an attractive price. The write performance in particular stands out. When reading, the SSD achieves an average transfer rate of 9,923 MB/s, with an access time of 0.10 ms. The I/O performance is 10,057 IOPS for 512-byte data blocks and 7,612 IOPS for 4,096 bytes...