I recently upgraded my RAM from 2 gb to 6gb pc800 RAM, and it didn't change my score 1 bit. So i doubt RAM has much of a factor, the Benchmark seems highly dependent on your GPU, not RAM. Unfortunately for me, I just bought my current card (building on a budget, have a 1GB DDR3 nvidia GT230), and upgrading that card is not going to be possible.
...Just out of curiosity though, my Windows Experience Index says that my HDD transfer rate is only 5.9, so I wonder if putting in a bigger and faster RPM drive would improve benchmark scores.
For the record, I scored 1425 on both benchmark runs, but the rendering played back very smoothly, even when there were a lot of characters and enemies on screen. The only time it dropped was during the rain/water splashing sequences on the boat, but went back to normal during the monster attack.
FFXI: Odin - Merylstryfe Summoner Woo Hoo!