SATA II is developed by chip giant Intel Intel and hard disk giant Seagate. Its main feature is that the external transmission rate has been further increased from SATA 150MB/s to 300MB/s. Sata3 is a new version of Serial ATA International (SATA-IO) released in May 2009, mainly to double transmission speed to 6Gbps, while being backward compatible with the old version of "SATA Revision2.6" (also known as SATA 3Gbps). The interface and data lines have not changed. The SATA3.0 interface technology standard was proposed by Intel Corporation in the first half of 2007. It was handled by Knut Grimsrud, Technical Director of Storage Product Architecture Design Department of Intel Corporation. Knut Grimsrud said that the transmission rate of SATA3.0 will reach 6Gbps and will be doubled based on SATA2.0 transmission rate.
Speed comparison between of Sata2 and sata3
The main difference between SATA2 and SATA3 is different transmission rate. The latest SATA3 transmission rate can reach up to 6Gb/s, while the SATA2 interface has a transmission rate of 3Gb/s. At the transmission rate, the SATA2 hard disk interface has been unable to meet the needs of SSDs and some Qualcomm mechanical hard disks.
It should be noted that the best read speed for the hard disk depends not only on the hard disk but also on the hard disk interface. In other words, as long as the hard disk supports STA3.0 interface, and the hard disk of this computer connected to the motherboard supporting SATA3.0 interface will play the best performance, so some old computer hard drives, the maximum support is only SATA2.0, when this kind of hard disk is connected to the SATA3.0 motherboard, the speed is still the speed of SATA2, because the hard disk itself is a hard injury.
Appearance Comparison of sata2 and sata3
From the appearance, SATA3 and SATA2 interfaces on the motherboard are basically the same, but on many motherboards, in order to let the user distinguish the sata2 and sata3 hard disk interfaces, different colors are often marked. Most motherboards that support STA3.0 interface sata2 are black, while SATA3 interfaces are yellow/white/blue, as shown in the following figure:
SATA2 and SATA3 motherboard hard disk interface appearance is basically the same, but many low-end motherboards still use sata2 and sata3 dual interface hybrid mode, like AMD platform A75, Intel platform B75, H81, B85 motherboard are sata2 and sata3 dual interface hybrid Mode, and some mid-to-high-end motherboards, such as A88, H87, Z87 and other motherboards are all SATA3.0 interfaces.
Bottom Layer Comparison of sata2 and sata3
HD Tune is a hard drive performance diagnostic test tool. It can detect hard drive transfer rate, burst data transfer rate, data access time, CPU usage, health status, temperature and scan disk surface. In addition, the firmware version, serial number, capacity, cache size, and current transfer mode of the hard disk can be detected in detail.
In the HD Tune underlying test SSD, we mainly refer to the average read transfer speed of the test. The native SATA3.0 interface, bridge SATA3.0 interface and SATA2.0 interface have an average read transfer speed of 359.8MB / s, 241.6MB / s and 204.3MB / s.
SSD overall storage performance Comparison between SATA2 and SATA3
Perform a PCMark7 run test and select PCMark7's auxiliary storage score score as the scoring object. The secondary storage score subkey focuses on testing the hard drive performance of the computer from disk.
In the PCMark run, the Flash Di Extreme Speed Series 240GB SSD is used as a slave on the Intel i7-3770k plus ASUS M5F motherboard platform, 5376 under the native SATA3.0 interface and 5161 under the SATA3.0 interface. Only 4531 under the SATA2.0 interface. The difference is more than 700 points. This is the performance gap between the overall storage and running.