Help with Samsung 2700 voltage and performance.

I just got my Asus P4S533, P4a 1.6 and a Samsung 256Mb 2700.
In Sisoft Sandra Memory Bandwith Benchmark I get 2875/2895.

Is that a good result?

I run the memory at 2.7 voltage and I can up it to 2.9.
At 2.9 I get better results, but could it damage my memory?
I have no chassifans at all and I use retail cooling, but will soon put on my watercooling.

If you have NO case airflow I would say that is a little high. YOur ram will get hot. I run at 2.9V but I have LOTS of airflow and my ram barely gets warm.