+append max_loop=32 vga=791 initrd=boot/initrd.gz init=linuxrc load_ramdisk=1 prompt_ramdisk=0 ramdisk_size=102400 root=/dev/ram0 rw rhgb quiet

Also '''don't forget''' to change <tt>ramdisk_size</tt> to 102400 for all kernels including Centos 4.4 default! And I suggest to remove <tt>quite</tt> parameter, to see what happens: it will help greatly if some problem will happen.