![]() With MLC, durability is often reduced by an order of magnitude compared to SLC, but exactly how much depends on over-provisioning, wear leveling and other factors. ![]() MLC (Multi-Level Cell) is the mainstream NAND variety and is used in nearly all consumer SSDs including the 840 Pro. Unfortunately this type of memory is also far more expensive to produce, so it is only used in the more pricey 'enterprise class' drives. SLC wears out very slowly and is therefore good for up to 100,000 program/erase (P/E) cycles. As the name implies, SLC only stores one bit of data per physical memory cell. The most durable type of Flash circuitry in SSDs is SLC (Single-Level Cell) NAND by a wide margin. Some background concerning the nature of TLC NAND might be useful in this context. ![]() We know from the 840 Pro review that this is a very competent controller, but in this case it has to work with slower TLC NAND. Its features include TRIM support, wear leveling and garbage collection. The MDX controller, which is used in both the 840 and the 840 Pro SSDs, uses three ARM Cortex-R4 cores running at 300 MHz and 512MB of LPDDR2 SDRAM cache. Considering Samsung's excellent track record in terms of reliability, this may well be a major advantage, since it lets Samsung control the entire production process. ![]() ![]() What makes Samsung different from its competitors is the fact that it produces all parts of the SSD, from controller firmware to NAND memory modules. ![]()
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