Originally Posted by teh_HyDr0iD
I have a quick question for some of you more experienced folk. I just installed a 256GB Vertex 4 over the weekend. I also have a much older 60GB Vertex 2. (Funny story, I paid almost as much for the Vertex 2 as I did now for my Vertex 4
) So as it stands I have my OS on the 60GB, Program Files on 256GB and I have 2x 500GB HDDs in RAID-0, all in my sig rig. From what I understand TRIM isn't supported in RAID mode (atleast not with my motherboard) so what I did was put my 500GB drives on the Intel controller in RAID mode (Blue ports in my case) and my 2 SSDs on the Marvell controller in AHCI mode.
This is how they benched.
Seeing how your Vertex 4s are benching is making me wonder if the marvel controller is holding it back at all? I have noticed you recommending against having an SSD on the Marvel controller. I also haven't updated the firmware yet which I really should do.
Now the system is fast, was fast even when I just had the 60GB in there, but I want to know if I'd be better off switching the 500GB drives to the Marvel controller and moving the SSDs to the Intel controller? Also, seeing some of you running 2 Vertex 4s in RAID is making me jealous.
The Marvell SATA controller IS why your results are poor, it does not provide true SATA 6Gb/s speed. The dirty little secret that appears in the Marvell spec sheet for the 912x series controllers, is they can only be connected to one PCIe 2.0 lane, at 5Gb/s. That is not per SATA port, but shared between two ports. Imagine running RAID on that controller with SSDs. If you can adjust the PCIe clock speed to the correct buss, you can get some additional speed out of the Marvell chip, but it will never match the new Intel SATA 6Gb/s chipsets.
It is such a shame that the X58 and P55 platforms do not have the SATA 6Gb/s interface that Intel first provided on their 6 series chipsets. You (and me) and many others have discovered the truth about the Marvell "SATA 6Gb/s" interface, that isn't.
I don't know if Marvell uses the same RAID format that Intel does (the SNIA DDF standard), so just switching your RAID volume to the Marvell port in RAID mode might not work, or perhaps corrupt it.