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How can I speed up the rate of DDR2 ?

Hi all :

I have been dealt with a problem of DDR2 for days.  My board is equipped with two DDR2 Chips each of which is 128M. And the model is SAMSUNG K4T1G164QF-BCF7.  I have used the DMA to test the rate of it.  For 1M data, it cost 21ms.(so the rate is about 46Mb/s)  It's too slow ! I think...  I've configurated the registers of DDR controller in the code of UBL. Some of them are shown as following :

SDTIMR :0x656D8DDA

SDTIMR2 :0x4236C742

SDBCR :0x00D78832

DDRPHYCR :0x000000C5

But no matter how I change the value, the rate is still about 46Mb/s...So if I want to speed up the rate, what can I do for it ? Could anybody give me some advice ? 

Thanks.