MBP i7 Intel-SSD RAID 0 讀很慢

請教一下板友

2011 MBP
CPU: i7 2.8G
RAM: 8G
HD1: Intel X25-M G2 120G (firmware: 2CV102HD)
HD2: Intel X25-M G2 120G (firmware: 2CV102HD)
Striped RAID 0

跑AJA System Test
File Size: 128MB
Video Frame Size: 720x486 8-bit
Write: 175MB
Read: 282MB

在網路上看類似的setup read幾乎都是輕鬆破400 很多都甚至到500+

請問有哪裡可能出問題？