When it comes to speeds what is faster having one 4GB module in your system or having two 2GB modules. I'm not taking in the fact that the system could have dual channel capabilities.

Also what about a server environment? Would it be better to have one large, high density module or break it up into several modules for speed and price?

I heard an engineer at my office having a discussion with an employee. He said that its better in all situations to have one large capacity modules instead of breaking it up. It would be cheaper and perform faster. He also said it would take longer for the computer to access what it needed if there were more modules instead of having just one.

His explanation didn't seem right to me and I thought I would post this question here to see what other people thought.