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ultrarunner
2 years ago

Where is the difference between DRAM and SLC?

He’s pretty good.

DRAM is (as the name already says) a RAM, can be described and read as often as desired – and is therefore suitable as a memory. Here, the bits are stored in tiny capacitors on the chip. Their charge must be refreshed regularly (refresh), and all data will be lost when switching off.

SLC, on the other hand, is a type of flash memory. The contents remain (thanks to floating gate field effect transistors) even without current, it can therefore be used for SSDs. Flash memories are, however, much slower than (D)RAMs and are used in writing (so contract only a limited number of write operations).

ultrarunner
2 years ago
Reply to  m14brazy

Normally flash, so with your two options SLC.

On a (D)RAM you cannot permanently install (at least when using a PC) because this would disappear when the PC is switched off.

The operating system already ensures that frequently used data automatically enters the RAM and is therefore quickly accessed.

Theoretically, you can also set up a so-called RAM disk, because you have to copy the required data beforehand and then have it available with RAM speed. However, there are only a few situations where this really makes sense, especially since you might need a lot of RAM.

sgt119
2 years ago

DRAM is volatile, i.e. suitable only for temporary storage of data. The mapping table is usually stored in the DRAM cache, which is significantly faster than to get it from the NAND every time. DRAM Cache is between 128MB and 4GB depending on SSD, much faster than SLC NAND and has lower access times

SLC is not volatile, so the data will remain even after the PC is shut down. Used as a write cache, since TLC or QLC is significantly slower. Especially with QLC SSDs, a large SLC cache is required, otherwise the write power can fall below HDD level for larger files