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 high-end motherboards, such as A88, H87, Z87 and other motherboards are all SATA3.0 interface.
In terms of difference, the main difference between SATA2 and SATA3 is that the transmission rate is different. The latest SATA3 transmission rate can reach 6Gb/s, while the SATA2 interface has a transmission rate of 3Gb/s. At the transmission rate, the SATA2 hard disk interface can no longer meet the needs of SSDs and some Qualcomm mechanical hard disks. The following figure shows the comparison of the hard disk read speeds of the same computer using the SSD and SATA3 interfaces.
SATA2 and SATA3 speed comparison
From the above picture, we can clearly see that in the same computer, the SSD connection speed of the SATA3.0 interface is faster than the SATA2.0.
It should be noted that the best reading 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, 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.
Similarly, if the hard disk supports SATA3.0, but the motherboard only has SATA2.0 interface, then the actual speed of the hard disk is only the speed of SATA2. When you install the machine, you need to pay attention to the fact that both must meet the conditions at the same time. Like the current mainstream mechanical hard disk and SSD are SATA3.0 interface, especially the current solid state hard disk is SATA3.0 interface, when users choose SSD, just select the motherboard that supports SATA3.0 interface.