Несколько вопросов mtrr_cleanup, SATA 6 Gb/s

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OS CentOS 6. При старте в messages получаю. Ерунда с оперативкой, как это лечить?

[    0.000000]  gran_size: 1G 	chunk_size: 1G 	num_reg: 4  	lose cover RAM: 942M
[    0.000000]  gran_size: 1G 	chunk_size: 2G 	num_reg: 4  	lose cover RAM: 942M
[    0.000000]  gran_size: 2G 	chunk_size: 2G 	num_reg: 3  	lose cover RAM: 1966M
[    0.000000] mtrr_cleanup: can not find optimal value
[    0.000000] please specify mtrr_gran_size/mtrr_chunk_size

И еще заявленный SATA III 6Gb/s работает как 3Gb/s.

[    1.153602] ata1: SATA max UDMA/133 abar m2048@0xf7e02000 port 0xf7e02100 irq 34
[    1.153712] ata2: SATA max UDMA/133 abar m2048@0xf7e02000 port 0xf7e02180 irq 34
[    1.153822] ata3: SATA max UDMA/133 abar m2048@0xf7e02000 port 0xf7e02200 irq 34
[    1.153932] ata4: SATA max UDMA/133 abar m2048@0xf7e02000 port 0xf7e02280 irq 34
[    1.154041] ata5: DUMMY
[    1.154104] ata6: DUMMY
[    1.458873] ata2: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    1.458880] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    1.458906] ata4: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    1.459421] ata3.00: ACPI _SDD failed (AE 0x5)
[    1.459501] ata4.00: ACPI _SDD failed (AE 0x5)
[    1.459592] ata2.00: ACPI _SDD failed (AE 0x5)
[    1.460865] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    1.471293] ata1.00: ACPI _SDD failed (AE 0x5)

Спасибо за ваши советы и ответы ;)