You will get whatever speed RAM your system takes. Anything faster, and it will only run as fast as your motherboard will support. Anthing slower, and it will just run at that speed. To find out what RAM your system takes, look at this thread and use the links to memory configurators. http://www.techsupportforum.com/har...tips-tricks/132698-before-you-buy-memory.html
The PC number refers to the bandwidth in MB/s. So PC3200 RAM will have a theoretical bandwidth of 3200 MB/s, or 3.2 GB/s. Just keep in mind that because of latencies, the RAM will never actually achieve this bandwidth.
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