Hello Chun,
welcome at Win-RAID Forum!

Here are my answers to your questions:

1. Both Operating Systems (Win7 and Win8.1) will be fine with your Samsung 840 Pro SSD. I personally prefer Win8.1 as the newer one.
2. You should connect your SSD to the first of the Intel SATA3 (6G) ports. This way you will get the best performance. The connection of your 4 HDDs to the Intel SATA2 (3G) ports will be no problem.
3. If you want to get the TRIM in RAID0 feature, you have to use an Intel RST RAID ROM v11 or v12.
   These are the options:
   • a) The easiest way is to choose the RST option of the BIOS. Then the "Intel(R) C600 Series Chipset SATA RAID Controller" (DEV_2826) of your system will be handled like an "Intel(R) Desktop/Workstation/Server Express Chipset SATA RAID Controller" (DEV_2822). You can use any original Intel RST RAID driver v11 or v12 series in combination with the original Intel RST RAID ROM v11.6.0.1702 without the need of modifying the BIOS. If you want to use the newest Intel RST RAID ROM version, you can update the v11.6.0.1702 to v12.7.0.1936 (the original = not modified module!).
   • b) Another possibility is to replace the Intel RSTe RAID ROM v3.7.0.1049 by any of the Intel RST RAID ROM modules v11 or v12, which I had modded for being usable with X79 chipset systems (newest version: Intel_RSTe_RAID-ROM_v12.7.0.1936_mod_by_Fernando_for_X79").
     If you should choose this option, the Intel SATA RAID Controller of your board will still be a C600 Series Chipset one (DEV_2826). You will have to use Intel RST RAID drivers of the v11 or v12 series, but a modified version of them, because the original RST drivers do not support X79 chipsets. To get Win7 or Win8 installed, you will have to load an Intel RSTe RAID driver of the v3 series, but once the OS is up, you can replace the RSTe RAID driver by a modded RST v11 or v12 series RAID driver (the driver update has to be forced by using the "Have Disk" option).
4. The modification of your X79 mainboard BIOS has to be done with the AMI Aptio MMTool. You will find my instructions how to do it within the start post of >this< thread.
5. If you want to get some informations about how to flash an MSI mainboard BIOS, you may look >here<.

Zitat von deviltronix im Beitrag #5

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Question about this post...on the Win-Raid Download page it specifically says 12.8.0.1016 is NOT for x79..

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1. The Intel RST(e) drivers v11/v12 series are generally not designed by Intel for being used with X79 chipset systems. For such chipsets Intel is offering the RSTe drivers v3.x.x.xxxx series.
2. Nevertheless X79 AHCI systems are supported by the original RST(e) drivers v11/v12.
3. X79 RAID systems are not supported by the original Intel RST(e) drivers v11/v12, unless the mainboard manufacturer has implemented the BIOS option to switch the X79 SATA RAID Controller to DEV_2822 and the user has chosen the switch.

Zitat von deviltronix im Beitrag #7

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Is the Bios Option to switch from 2826 to 2822 obvious?

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Zitat

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I have two options to pick in Bios...RSTe 3.5 or RST 11.6
Running RSTe 3.5 option (upgraded to 3.7.0.1049) and it comes up as 2826 In Hardware ID

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That is correct. If you would have chosen the Intel RST BIOS option, the HardwareIDs of your Intel SATA RAID Controller would be shown as DEV_2822.

Zitat von deviltronix im Beitrag #9

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If my RSTe 3.5 rom has been updated to 3.7.0.1049, what has the RST 11.6 been updated to?

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Zitat

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(And what driver would be optimal for it?)

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Intel's RST(e) drivers v11.7.4.1001.

Zitat

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I could switch the Bios over to DEV_2822 but I'm afraid to play around with it, everything is finally running as it should be.

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In this case I recommend to stick with the "original" Intel RSTe RAID ROM v3.7.0.1049 and to install the Intel RSTe drivers v3.8.0.1108 WHQL resp. the RSTe Drivers & Software Set v3.8.0.1111.

Zitat

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By asking this I am assuming the Rom updates always update both versions and they are standardized.

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No, the mainboard manufacturers do not update both Intel RAID ROM versions (RSTe and RST) automaticly, because they belong to totally different development branches.