Solid State Drives are a great way to boost your PC’s performance. Unfortunately, they’re not all created equal. One of the most significant differences between all of the different solid-state drives on the market is whether it has DRAM. It doesn’t matter which form factor you’re considering – SATA, M.2, or PCIe. All SSDs either have DRAM, or they don’t. Having DRAM is almost always going to bump up the price of the SSD.
DRAM-less SSDs store the map of data straight to the NAND Flash memory. As we mentioned earlier, NAND memory is slower than DRAM. Unfortunately, this results in slower overall performance.
Additionally, storing the map directly to the NAND flash means more wear and tear on the memory cells. Regrettably, his can significantly decrease the SSD’s life span. It is usually why DRAM-less SSDs have a shorter warranty period than SSDs with DRAM.
Newer SSDs can sometimes use system RAM instead of a DRAM cache, so research if your SSD supports that.
It has low performance, low durability, poor quality, worse warranty.
SSD can't use CPU RAM for caching. The spec you'd be looking for is Host Memory Buffer support to see if it supports that.