https://www.speedguide.net/faq/slc-mlc-or-tlc-nand-for-solid-state-drives-406
SLC, MLC or TLC NAND for Solid State Drives ?
Tags:
TLC,
MLC,
SLC,
NAND,
ssd,
eMLC
SSDs (Solid State Drives) use NAND flash chips. Each of these chips contain millions of cells with limited number of write cycles. There are different types of NAND flash chips in use today with different characteristics as follows:
SLC (Single Level Cell) - highest performance, at a very high cost, enterprise grade NAND
~ 50-100k P/E (Program/Erase) cycles per cell, highest endurance
- lowest density (1 bit per cell, lower is better for endurance)
- lower power consumption
- faster write speeds
- much higher cost (3+ times higher than MLC)
- good fit for industrial grade devices, embedded systems, critical applications.
eMLC (Enterprise Multi Level Cell) - good performance, aimed at enterprise use
~ 20-30k P/E cycles per cell, great endurance
- high density (2 bits per cell)
- lower endurance limit than SLC, higher than MLC
- lower cost
- good fit for light enterprise use and high-end consumer products with more disk writes than MLC.
MLC (Multi Level Cell) - average performance, consumer grade NAND
~ 5-10k P/E cycles per cell
- higher density (2 or more bits per cell)
- lower endurance limit than SLC/eMLC
- lower cost (3 times lower than SLC)
- good fit for consumer products. Not suggested for critical applications which require frequent updates of data
TLC (Three Level Cell) - lower performance, lowest cost NAND
~ 1-5k P/E cycles per cell
- highest density (3 bits per cell)
- lower endurance limit than MLC and SLC
- best price point (30% lower than MLC)
- somewhat slower read and write speed than MLC
- good fit for lower-end consumer products. Not recommended for critical applications which require frequent updating of data
3D Vertical NAND - newer TLC NAND with different architecture, larger geometry and much higher endurance than TLC
~ 1-10k P/E cycles per cell
- faster and more reliable than TLC
- uses less power than TLC
- performance and P/E cycles comparable to MLC
Generally, SLC drives are traditionally the fastest, most reliable and most expensive drives available, usually used in the enterprise because of their considerably higher cost. Both MLC and TLC are widely used consumer grade memory, with MLC being better in terms of endurance. Newer 3D NAND TLC is comparable in performance to MLC drives, with even better price point.