Physical memory quantity vs. performance

Forgive the ignorance of the question, but I did search somewhat and wasn't able to find exactly what I was looking for.

Keeping some assumptions in mind as far as what HW I'm using (Abit AN8 32X) and how much total RAM I'm using (1GB) I had some questions about advantages/disadvantages on how to deply it.

The question is what are those (dis)advantages between using a single gig stick vs (2) 512 vs (4) 256?

Thanks!
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More about physical memory quantity performance
  1. Sometimes motheboards won't support X number of sticks at full speed, and have to slow them down. To use dual channel memory you'll need 2 sticks (or 4 sticks, or sometimes even 3 sticks will work depending on the chipset/motherboard) Beyond that, that's really no advantage or disadvantage to it, except that if you use 4 sticks and fill up all your slots you can't upgrade without removing some of those sticks.
  2. While it depends on a few differing things, such as processor type (AMD/Intel) as well as motherboard manufacturer and ram, two sticks of ram will run better than 4 sticks, the reason being, command rate, that is 1T or 2T.

    I wish I could find the article i was looking for, but this will suffice somewhat.
    http://www.anandtech.com/memory/showdoc.aspx?i=2560&p=2

    In the article they compare 2x512mb to 4x512mb sticks and its pretty neat, though again, not the article I had read initially, though if I find it I'll edit it in.

    EDIT: Heres another comparison, while its not directly related per say, it does touch on the topic and issues with 4dimms vs 2dimms
    http://www.xbitlabs.com/articles/memory/display/2gb-ram.html
  3. I forgot to mention the assumption that the timings were the same as well.

    Thanks for the links. I'll take a look.
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