Memory mixing

I have a few sticks of PC2700 memoery, totalling about 1gb. I already have 512 of PC3200 in the motherboard, what will increase performance? Leaving the 512m and  not installing the other stuff (to take to 1.5GB), or have more memory running slower - the PC3200 will clock down to the slower speed automatically I gather??
Thanks

I would say on what you are doing with your computer.  
You would probably get slower benchmarks with the additional slower ram,  but you would probably experience that the computer is runnning better with the additional ram.  Especially loading and exiting programs.
If you are playing battlefield vietnam, I would say there is a great difference between 512 and 1 gig.  1 gig loada alot smoother and gameplay is better.
I would run the extra ram if it works, and down the road get another matching stick of 3200.  But buy the exact same brand and speed if its working ok for you.

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