Help, SSD DRAM vs NAND vs NVME

[evilside123]

Can you please explain this kind of SSD's?
I am very much confused now.
Because there are some SSD's that has no DRAM, I want to avoid that but I am very confused about those 3.

[zombienerd]

SSD - Solid State Drive
DRAM - Dynamic Random Access Memory
NAND - a type of Flash Memory
NVME - A drive connected directly to PCIe bus, not SATA.

SSD does not require DRAM, but having a DRAM Cache can speed up the drive.

Nearly all SSD's (Sata AND NVME) use NAND flash.

NVME connects to the PCIe bus instead of using SATA.

Basically, the difference to the end user is speed.   NVME is faster than Sata.  DRAM cache speeds up any drive.
 

[evilside123]

31 minutes ago, zombienerd said:

SSD - Solid State Drive
DRAM - Dynamic Random Access Memory
NAND - a type of Flash Memory
NVME - A drive connected directly to PCIe bus, not SATA.

SSD does not require DRAM, but having a DRAM Cache can speed up the drive.

Nearly all SSD's (Sata AND NVME) use NAND flash.

NVME connects to the PCIe bus instead of using SATA.

Basically, the difference to the end user is speed.   NVME is faster than Sata.  DRAM cache speeds up any drive.

Thank you so much for your answer, I am confuse on the DRAM part because as it said on LMG video that DRAM SSD's are much better that DRAM-LESS. The problem is how to differentiate the two? How to spot a DRAM-less one? How to avoid it if I will buy a NVME SSD.