If you add 2x1 gig to the base config, do you enable 256-bit addressing?

I can't seem to find a definitive answer to this anywhere...do all four RAM modules need to be "matched" for 256-bit addressing to be working, or will the 256-bit addressing work with 2x512mb + 2x1gb?
Is there any way to verify the addressing on a Mac Pro? System Profiler doesn't seem to do this, does any other software let you check the addressing?

This is looking more complicated than most RAM situations I've dealt with
It's actually not. It's rather simple really… if you can saturate 3GB (2 x 1GB + 2 x512MB) then the performance of your system will always be better than if it had 2GB (4 x 512MB). If that's what you can afford then that is best.
Basically what you are doing is over complicating things by doing the constant "what if" thought. As with any other system, more RAM is better if your needs and usage will saturate that RAM.
Personally I'll be going to 5GB (2 x 1GB + 6 x 512MB) with an intermediate step to 3GB (6 x 512MB) having started with 2GB from Apple.

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