PNY CS900 4TB vs Samsung 870 EVO 4TB
The site holds no current price for at least one of these, so what follows compares specifications alone.
| Specification | PNYCS900 4TB | Samsung870 EVO 4TB |
|---|---|---|
| Capacity (GB) | 4000 | 4000 |
| Sequential read (MB/s) | 560 | 560 |
| Sequential write (MB/s) | 540better | 530 |
| Current best price | — | 1 269,00 €at Amazon.fr · captured 2026-09-13 |
| Price per TB | — | 317,25 € |
| Warranty (years) | 3 | 5better |
| DRAM cache | — | Yes |
| NAND type | tlc | tlc |
| Controller | — | Samsung MKX controller |
How these two compare
Sequential throughput
PNY CS900 4TB is rated 560 MB/s read and 540 MB/s write; Samsung 870 EVO 4TB, 560 MB/s read and 530 MB/s write. The SATA link tops out around 550 MB/s each way, and both work against that ceiling; the more telling differences between SATA drives are how each holds up under sustained load, whether it carries a DRAM cache, and how much writing it is rated to take.
DRAM cache
the catalog does not state whether PNY CS900 4TB carries a DRAM cache; Samsung 870 EVO 4TB carries a DRAM cache. A DRAM cache holds the drive's mapping table — the index of where each block physically sits — so the controller places and finds data without an extra flash lookup. A DRAM-less drive borrows a little system memory (HMB) or a slice of its own flash instead, and is likelier to slow once a long run of random writes outlasts its fast cache.
NAND, controller and warranty
NAND: PNY CS900 4TB uses TLC and Samsung 870 EVO 4TB uses TLC. The tier is bits per cell — SLC, MLC, TLC and QLC from one to four — trading density against endurance and sustained-write speed: QLC is cheapest per gigabyte, TLC the mainstream balance, and the denser the cell the sooner sustained writes taper. On the controller: PNY CS900 4TB's controller is not stated, and Samsung 870 EVO 4TB uses the Samsung MKX controller. It is the chip handling error correction, wear-levelling and where each write lands — much of how a drive holds up under load — even if the part number on its own tells you little. On the cover: PNY CS900 4TB carries a 3-year warranty, Samsung 870 EVO 4TB carries a 5-year warranty. The length is the maker's own vote of confidence, and on an SSD it tends to track the endurance rating — a longer warranty usually meaning more rated writes.
Which to buy
With a price missing for at least one side, there is no cost verdict to give. What separates two otherwise-similar drives is up in the sections above — sustained and random behaviour, whether there is a DRAM cache, the flash tier and the warranty — so weigh those against what your build needs.
Common questions about this pair
- Which is faster, PNY CS900 4TB or Samsung 870 EVO 4TB?
- PNY CS900 4TB is rated 560 MB/s read and 540 MB/s write; Samsung 870 EVO 4TB, 560 MB/s read and 530 MB/s write. The SATA link tops out around 550 MB/s each way, and both work against that ceiling; the more telling differences between SATA drives are how each holds up under sustained load, whether it carries a DRAM cache, and how much writing it is rated to take.
- Should you buy PNY CS900 4TB or Samsung 870 EVO 4TB?
- With a price missing for at least one side, there is no cost verdict to give. What separates two otherwise-similar drives is up in the sections above — sustained and random behaviour, whether there is a DRAM cache, the flash tier and the warranty — so weigh those against what your build needs.