Storage technology has developed so far, the sound of solid-state drives replacing mechanical hard disks has always been there, and many old manufacturers who have been insisting on doing HDD have begun to transform the development and production of SSDs. Nowadays, the SSD of the SATA interface can no longer meet the storage needs of users, and the NVMeSSD with higher performance has appeared in everyone's field of vision. Perhaps many people are no longer unfamiliar with M.2SSD, but still hesitant to buy, today to tell you why M.2SSD is recommended.
Faster and faster information age office rhythm, everyone buys notebooks, desktop computers are in the direction of thinner and lighter, more convenient to carry to buy, which requires every part to compress the volume. The SSD size of the NVMeM.2 SSD interface is small, which can meet the needs of users who pursue lightness. Because of the interface changes, when installing NVMeM.2 SSD, there is no need to connect wires, there is no need to find SATA cables and other jumpers, and there is no need to worry about the transmission speed limitation of different SATA interfaces.
The biggest difference between mechanical hard disk and SSD solid state is performance, that is, the gap between read and write speed. The read speed of the general mechanical hard disk is about 150MB/s, while the read speed of SATASSD can hit 600MB/s, the NVMeM.2SSD can even reach more than 3500MB/s, and the SSD is lower than the mechanical hard disk in terms of power consumption. Compared with the conventional 1.8-inch hard disk weight is lighter, because the SSD does not have a mechanical motor and a fan, the noise value is 0 decibels when using, there is no mechanical moving parts inside, there will be no mechanical failure, and it is not afraid of collisions, shocks and vibrations. Because the SSD uses a flash memory chip without mechanical components, it has the characteristics of small heat generation and fast heat dissipation.
In the development of the SSD industry so far, there are two most mainstream transmission protocols. One is the AHCI protocol and the other is the NVMe protocol, so what is the protocol? For example, if we go from Chengdu to Beijing, the passage is the route to be taken, whether to fly directly or first to Hainan and then to Beijing, the agreement is like a method of transportation, whether to make a plane or take a train. From this metaphor, it can be seen that fast SSDs support the NVMe protocol and take the PCI-EX4 channel. If your motherboard supports both the M.2SSD extension and the SATA3.0SSD, you need to look through the manual to see if there is a conflict between the M.2 interface and the SATA interface, otherwise the M.2SSD will not be recognized.
The earliest SSD to SATA interface-based, from SATA1.0 evolution to today's SATA3.0, ordinary 2.5-inch SSD and HDD are used this interface, the theoretical transmission bandwidth up to 6Gbps, but after the SATA3 interface, the fastest development speed is the M.2 interface, M.2 interface can support SATA and PCI-E channels at the same time. At present, the mainstream M.2 interface and the full turn to PCI-E3.0×4 channels, the theoretical bandwidth can reach 32Gbps, and now several major brand manufacturers PCIe3.0M.2 SSD read and write speed are basically in the 3200MB/s-3400MB/s range, which is already very strong in performance.
There are two types of M.2 interfaces: Socket2 and Socket3. Socket2: SupportSATA, PCI-EX2 channels, and if the PCI-E2.0×2 interface standard is used, the maximum theoretical speed can reach 10Gbps, equivalent to 1GB/s.
Socket3: Supports PCI-E3.0 ×4 channels, with a theoretical speed of up to 32Gbps.
Since the encoding scheme of PCI-E3.0 also changes from 8b/10b of PCI-E2.0 to a more efficient 128b/130b, it is converted to: 32/8X (128/130) = 3.94GB/s.
Equivalent to 3.94GB/s, what is this concept? If the SSD of this M.2 interface is fast enough, the speed will be about 20 times faster than the current mechanical disk, and more than 4 times faster than the current SATA3 SSD.
It can be seen that the current mainstream SATA 3.0 channel maximum transmission speed of 6Gbps, the actual speed of up to 560MB/s, SATA channel has been unable to meet the growing read and write speed of SSDs, so PCI-E SSD came into being. However, it should also be noted that in fact, not all M.2 SSD read and write speeds are very fast, if it is an M.2 interface SSD using SATA channels, the read and write speed will not exceed 550MB/s, and the M.2 SSD using the NVMe protocol, the maximum read speed can reach 3.5GB/s, which is 7 times that of the traditional SATA SSD!
But compared to PCIE 4.0, the advantages of PCIE3.0 are not so great. Most of the PCIE4.0 on the market has gradually replaced PCIE3.0, and the advantages of PCIE4.0 are also many.
1, faster, X16 bidirectional bandwidth reached 32GB/s, which is twice as high as PCIe 3.0.
2, backward compatibility, PCIe 4.0 can be compatible with PCIe 3.0 devices.
3, PCIE 4.0 can achieve higher read and write speeds, 3.5GB/s higher than PCIe 3.0
4, more connections, PCIe 4.0 high bandwidth, 1 top 2, you can connect more devices without worrying about performance degradation.