Can't achieve 6GB/s with sata 3 HHDs

Hi all,
I just did my first MSI build on the 880GMA-e53.
Using two WD sata 3 blue HDs, 500 GBs each configured in raid 0 using the Marvell SE9128 controller. Yes I'm on the correct sata ports, 7,8.
Installed XP home 32 bit, partitioned the drive, then installed w7 pro 64 bit.
Device manager is clear and the pc is nicely responsive.
However, using HD tune it shows just over 200MB/s at best and says I have sata 2 HDDs under the info tab.
HD tune is outed.
Using Atto, I only max around 225MB/s.
I am using sata cables that I had for awhile and they are around 18" long.
Bios is set to IDE not ACHI and naturally I am enabled and set to RAID.
Downloaded a file from MSI for sata 3 support.
Why am I nowhere near 6GB/s?
Setup: PhenomII 550, two cores successfully unlocked, tested in torcher mode using intel burn.
8 GBs of OCZ black edition ram. Running the onboard 4250.
Seasonic PSU 530 watt.
When I was running blue WD hdds in my asus M4a78T-E
in a raid 0 config, 320GBs each, it scored the same HDD number as my sata 3s, 5.9.
Why no faster?
Thank you in advance,
Sabbath

Quote from: sjay on 10-April-11, 11:31:08
You also need sataIII cables
That's also a marketing myth, there's no such thing as a 'real' SATA rev3 cable. Found this info from another site:
Quote
Here is what the SATA-IO organisation that specifies the Sata revisions says about cables in its FAQs
http://www.sata-io.org/documents/SATA-Revision-3.0-FAQ-FINAL.pdf
Q9: Does SATA 6Gb/s require different connectors and cables to support the higher
transfer speed?
A9: The same cables and connectors used for current SATA 1.5 and SATA 3.0 Gb/s implementations can be used to connect SATA 6Gb/s devices, although SATA-IO recommends
quality components be selected to ensure data integrity and robust operation at the faster SATA
6Gb/s transfer rate. Keeping the existing SATA connector form factor enables SATA 6Gb/s to
be designed into the same cost-conscious hardware architectures while minimizing
infrastructure changes.
Q14: Were there any attenuation or jitter issues that had to be addressed with the jump to
6Gb/s?
A14: Ensuring signal integrity was the primary challenge in doubling the SATA transfer speed
for a second time while using the same cables and connectors that were originally defined for
the first generation 1.5Gb/s version.
Quote
"SATA Revision 3.0 was designed to facilitate a much more elegant – and cost
effective – migration to higher data rates. Rather than completely redefining the spec,
SATA Revision 3.0 achieves its data rate increase by faster signal switching. While this
has resulted in changes to the PHY, modifications to the protocol have been kept to a
minimum. In addition, SATA Revision 3.0 is backward compatible so that the same
connectors and cabling used for SATA 3 Gb/s under SATA Revision 2.6 can be used for
SATA 6Gb/s.
This decision not only enables end-users to retain their existing investment in
cabling when moving to SATA 6Gb/s
, it also enables silicon manufacturers to maintain
much of their existing IP. Except for the doubling of the data rate, SATA Revision 3.0 is
no more complex than SATA Revision 2.6 from an electrical perspective, and no heroics
are required to implement the technology at 6Gb/s speeds."
And finally,
Quote
I just recived my Akasa SATA3 cables yesterday. I have been using the SATA2 cables and there is abselutly no diffrence between performance on SATA2 vs SATA3 cables. All benchmarks were the same, so it looks like it is just an selling argument that you need SATA3 cables.

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