If I removed the two 2GB 1333MHz memory modules and replaced them, would it be better to use memory modules with a clock speed higher than 1333MHz, or would that not be compatible with the system since the original memory modules were 1333MHz?
work. But you would get no gain from it. The memory would automatically be under clocked to 1333 by the motherboard BIOS.
Both brands you listed are quality brands.
While mismatching memory, keeping the OEM Dell and adding either the Kingston or the Corsair may
work, I would stick with one manufacturer for all the RAM. Whether you buy more from Dell to add to your existing memory or completely swap it out with Kingston or Corsair.
What does Dual Channel mean? Is that some sort of special memory, or is it just any pair of memory modules?
Dual channel basically means there are two pipelines, so to speak, to transfer data to and from the memory.
As opposed to one on single channel.
Edited by ThunderZ, 15 March 2011 - 01:17 AM.