[SOLVED] Total SATA bandwidth of Intel H370 chipset

[garyelmes]

Possibly dumb question, but:

The Intel H370 chipset offers 6x SATA III ports, a function that the Intel spec sheet describes as offering "up to 6 Gb/s". Now, I know that SATA III is a 6 Gb/s protocol, but the Intel spec sheet is wonderfully ambiguous about whether the H370 supports 6 Gb/s on each port simultaneously, or just 6 Gb/s in total across all ports. (It described the PCIe channels as "8 Gb/s each", but that magic word "each" is missing from the SATA III port description.)

On my Asus H370 mobo, I have 6x SATA III drives in a ZFS array, and I'm wondering if I would get better disk i/o from them with a PCIe HBA than I'm currently getting with the native SATA ports...

TIA

 

[kerberos_20]

it supports 6Gbs each, but chipset is connected to cpu with fixed pcie lanes in serial fasion, so it get shared between all I/O chipset has to work with
so it doesnt matter if u use pcie card or internal connections (any), it will still hit same hard cap
CPU to PCH is using DMI 3.0 which has hard cap of 4GB/s (32Gbps)

 

[garyelmes]

Except that there are 16 PCIe lanes connected directly to the CPU rather than via the PCH. These are intended for a graphics card, but could presumably be used byan HBA, no?

 

[kerberos_20]

yes, those 16 lanes can be used for anything