The more processes you can kill the better your score will be.
See guide here:
Also, HT off for 03 and 05 will usually net you about 200 more points is what I have been hearing a lot.
Memory speed is a must, but keep timings moderately tight. I usually figure stock timings, max OC, then try and tighten sub timings.
EDIT: And for GPU it will depend on what you have, I know the 4890's get more from GPU than mem.