pawel@paulbook:~$ dmesg | grep -i sata | grep 'link up'
[ 2.355461] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[ 2.691842] ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[29631.906614] ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[29631.914605] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[41633.796009] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[41633.803999] ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
pawel@paulbook:~$ dmesg | grep -i --color ahci
[ 1.994964] ahci 0000:00:1f.2: version 3.0
[ 1.995148] ahci 0000:00:1f.2: irq 48 for MSI/MSI-X
[ 1.995180] ahci 0000:00:1f.2: SSS flag set, parallel bus scan disabled
[ 2.011185] ahci 0000:00:1f.2: AHCI 0001.0300 32 slots 6 ports 6 Gbps 0x35 impl SATA mode
[ 2.011191] ahci 0000:00:1f.2: flags: 64bit ncq sntf stag pm led clo pio slum part ems sxs apst
[ 2.035576] scsi0 : ahci
[ 2.035697] scsi1 : ahci
[ 2.035794] scsi2 : ahci
[ 2.035873] scsi3 : ahci
[ 2.035939] scsi4 : ahci
[ 2.036000] scsi5 : ahci
pawel@paulbook:~$ dmesg | grep -i ahci | grep -i --color Gbps
[ 2.011185] ahci 0000:00:1f.2: AHCI 0001.0300 32 slots 6 ports 6 Gbps 0x35 impl SATA mode
To me it seems that my mainboard has a SATA 6 Gb/s. However, when I benchmark my SSD I get less than 400 MB/s reads even though the vendor claims "550 MB/s sequential reads on both compressible and incompressible data" is available:
pawel@paulbook:~$ sudo hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 1098 MB in 3.00 seconds = 365.76 MB/sec
Does it mean my mainboard has SATA 3 Gb/s? According to lspci
I have Intel Corporation 6 Series/C200 Series Chipset Family but I couldn't find any information in the Internet which SATA is supported.