Help With Conroe E6600

Ok,
here is my problem
I have an e6600 on an asrock 945g-dvi mainboard witha leadtek 7600gt
graphics card. When i first got the computer i had a stick of corsair select
533mhz 1gb memory. I since have brought some corsair XMS2 667Mhz 2x 1gb to
enable dual channel. When I had the 1gig stick i couldn't raise the fsb past
300 giving me a clock speed of 2.7mhz.
Now I have the so called good quality ram and running dual channel I still
can't get the fsb past 300mhz, even though it is faster ram. My 3d marks
have not increased, so basically i have spent $430 dollars for no gain (how
****ed am I)
I have checked all my bios settings and everything seems set right.
In the bios there are no multiplier settings, only fsb is adjustable and u
can't increase the v-core cause it is locked. I am very frustrated as I
thought going from 533mhz to 667 mhz ram and enabling dual channel i would
see some improvement, but nothing, I am open to any suggestions!