I copied the specification of my Asus X79WS which is not the cheapest.
Intel® X79 chipset :
2 x SATA 6Gb/s ports (gray), gray
4 x SATA 3Gb/s port (black), blue
Support Raid 0, 1, 5, 10
Marvell® PCIe 9128 controller :
2 x SATA 6Gb/s ports (gray), navy blue
Support Raid 0, 1
No SATA2 ports and 4 x SATA3 ports
Do you know a motherboard with more SATA6 ports?
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Hello Huib.
Little correction:
2 x SATA 6Gb/s ports (gray), gray = SATA3
4 x SATA 3Gb/s port (black), blue = SATA2 ( you wrote no SATA2 ports which is wrong )
Marvell® PCIe 9128 controller :
2 x SATA 6Gb/s ports (gray), navy blue
Sata ports from this MARVELL chips are crap
This chip is connected to PCIE 2.0 1x speed which means it has only 250MBps transfer speed for write. It is less than ONE good ssd drive. If you raid them on this controller I guess it will be slower than non raid ssd. This is much much worse than SATA2 from Intel chipset.
This system builder really didn't know what was he doing.
The solution is to rearrange the drives, remove some of them from raid and plug them into different ( appropriate ) sockets.