I have achieved a RAID-0 Dual-Boot, and break 1GB/Sec in both Windows and Linux. REQUIREMENTS:2 HDs or 2 SSDs of the same exact size
Original Windows 7 NON-SP1 DVD or an SP1 DVD that YOU KNOW installs as MBR, because having MBR is the MOST important part, and it WILL NOT work using UEFI
Linux DIstro DVD of your choice
I determined my OS sizes like this:
(Total size * .8) / 2
This allowed for 20% Over provisioning, and equal sized partitions for Windows and Linux
For regular HDs, don't worry about the OP, and choose your own sizes.
SETUP:
Ctrl-I enters the RAID configuration
For SSD, un-RAID-0 them if already RAIDED by deleting them in the RAID configuration, change the BIOS SATA Configuration to AHCI and Secure Erase them, change the BIOS back to RAID, and Re-RAID-0 them.
For HD, change the BIOS SATA Configuration to RAID, and reboot. RAID-0 them in the RAID configuration. They will be erased.
Windows Installation: Begin to install Windows 7. Make sure it sees your RAID partition. When it says that it will create multiple partitions, allow it to do so. Delete the MSR Reserved partition, and extend the 100MB System Partition to your desired size for Windows. Create the other partition for Linux now, and format it. Install Windows to the System partition you extended.
Linux Installation:Boot to your LiveCD, and open GParted. DO NOT manage each drive separately. Using the drop down list, Choose the Large RAID partition. You will see your Windows partition and another one as NTFS. Format the partition you made for Linux during the Windows setup as EXT4
Start the Linux Installation. Because it is RAID-0 it will list your partitions twice. You will be using the first set of partitions. Click on your EXT4 partition and click Change. Give it EXT4 File System and Mount Point / and choose NOT to format it, you already did so with GParted.
On the dropdown for where GRUB will be installed, choose the partition you will be installing Linux on. Mine was Brian2, yours may be similar. It will also warn you that you don't have a SWAP partition, click continue, you don't need a SWAP partition, we have enough RAM. It will also warn you that you chose not to format, click continue. Once the installation is complete, it will give you a message stating that the bootloader installation failed. It will ask you if there is somewhere else you'd like to install it. Attempt to install it to EVERY partition with the same name as the one you installed Linux to. It will fail EVERYTIME. Choose continue without a bootloader, and reboot.
GRUB2 will be there.
PROFIT WITH RAID-0 DUALBOOT!!!!
Benchmarks:Linux:

Windows:
G75VW-DS73-3D | 670m 3GB | 32GB RAM | 1TB RAID-0 2 x 830 512GB SSD DualBoot | Killer-N 1103 WiFi