Using PC3200 and PC2700 Memory Together

I currently have 2 sticks of 256 DDR PC3200 (400) memory for my HP.  I accidently bought 2 sticks of 256 DDR PC2700 (333) memory.  If I install this new memory, the PC2700, into my PC with my existing PC3200 memory, will my PC run faster?  If there's a compatibility issue or not much of a difference I'll just return the memory and purchase PC3200, but I did get a deal, so I was hoping I could use it.  Thanks in advance for the help.
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Mixing RAM will not make any difference to the total amount of RAM in  your PC. One dissadvantage, though will be that all your RAM will only run at the speed of the slower RAM. This speed differance will probably not really be noticable, as it doesn't make that much differance. Having more RAM will benefit you much more (provided you are using a OS which can utilize that much RAM).

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