what it means is that the RAM is called DDR2 and the speed of the chips is 666MHz doubled (that is 2x666 = 1333MHz)
What I was saying is that it is better invest a little bit of money extra and go for DDR2 800MHz otherwise called 1600 (2x800=1600) RAM becuase it will be easier to overclock your system later if you may desire, without too much trouble up to about 3,6 - 3,9GHz.
Yes, the more the better, we are in the Gigabytes now so, it will take a few years until games or other applications can use the 8Gb you already have, so much longer for 16Gb.
It goes without saying that you need to install Win7-64bit on your machine (winXP, win7-32bit will only see 3Gb of RAM, irrespective of how much you have installed).
RAMDISK is a technick that uses some of your RAM in order to make a virtual hard disk. It behaves like a hard disk but it is extremely fast because it runs on RAM.
Sometimes people use it in order to speed up the loading time of their games (the game loads probably 10times faster from the RAMDISK than from a normal hard disk). If you do know about it, it is no relevent for you.
Summarizing:
1. Better 8Gb 1600 RAM
2. If money not an issue, better 16Gb 1600 RAM
3. 16Gb 1333 RAM
4. 8Gb 1333 RAM
-- (no ranking) 8Gb or 16Gb will play no role to how many aiplane you will be able to load in missions
My personal advice regarding priorization.
Either case, it will be a terrific machine!
~S~
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