I have four SSDs connected to the motherboard. SATA ports are set to RAID mode using Intel RST, although I'm not sure if that even matters. The system is a Dell 7920. I build the virtual disk like this:
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# mdadm --create /dev/md0 --level 0 -n 4 /dev/sd[b-e]
# cat /proc/mdstat
Personalities : [raid0]
md0 : active raid0 sdb[0] sde[3] sdd[2] sdc[1]
1999900672 blocks super 1.2 512k chunks
# parted -s /dev/md0 gpt
# parted -s /dev/md0 mklabel gpt
# parted -s -a optimal /dev/md0p1 mkpart primary 0% 100%
# mkfs -t ext4 /dev/md0
# mount /dev/md0p1 /mnt/RAID
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# dd if=/dev/zero of=/mnt/RAID/testfile bs=1M count=2000 conv=fdatasync
2000+0 records in
2000+0 records out
2097152000 bytes (2.1 GB) copied, 2.20422 s, 951 MB/s
# dd if=/mnt/RAID/testfile of=/dev/null bs=1M iflag=direct
2000+0 records in
2000+0 records out
2097152000 bytes (2.1 GB) copied, 2.24319 s, 935 MB/s