DDR Memory Bandwidth Issue

Hi Group,

I am using beagle board and using "mem bench" program to measure the
memory bandwidth (cross compiled using "arm-none-linux-gnueabi-gcc").
I am getting around 380 MB/S. The memory bandwidth is suppose to be
around 700 MB/S. I have downloaded x-loader, u-boot, kernel from
beable.org and booting kernel from SD/MMC. Please suggest me where to
look into? x-loader, u-boot, kernel or compiler flags. Is there any
benchmark program available to measure memory bandwidth?.

The following versions are used to boot beagle

x-loader : Texas Instruments X-Loader 1.41
u-boot : U-Boot 1.3.3 (Jul 10 2008 - 16:33:09)
Kernel : Linux-

Thanks & Regards
Ganeshan N