graphics card - Adding DDR2 1066MHz to DDR2 800MHz memory

My Current system has 2x1GB DDR2 800MHz memory, installed on Intel DG965WH board which supports up to 1066MHz.

I would like to add some memory and my question is what would be the best configuration for me:

1. 2x1GB 800MHz + 2x2GB 800MHz = 6GB 800MHz


2. 2x2GB 1066MHz = 4GB 1066MHz

I also intend to by a video card (Sapphire ATI Radeon HD 6950 2GB GDDR5) which supports 1066MHz.

I use my computer for Java development and Games from time to time.

So what would give me the best performance? Quality or Quantity?

Answer

Nearly always quantity, assuming a basic level of quality, as long as you maintain dual- or triple-channel functionality.

"Quality" (speed) takes over once you've reached an amount of physical RAM that is no longer being completely consumed by the applications you're running.