We are currently using a Xeon X3470, which supports up to 1333. I'm thinking of getting 4 1GB sticks, but am a little confused on the terminology. So if I were to get RAM, I know for sure it needs to be ECC for purposes of our heavy SQL database use, but then comes buffered/unbuffered, registered/unregistered, and low-density/high-density. What would I need to specifically look for on my search?
But at the same time, my current DIMM's are already running 1333, so it might not be even worth the effort. Maybe at a minimum, just add 2 more 2GB sticks to have 8GB. This is of course with the understanding that the system will only see 4GB. But in that situation, would the system be evenly using all 4 sticks, up to 4GB? This might be a good upgrade to do just in case there is a x64 upgrade path in the future.