iMac RAM Question

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I haven't received my 20" iMac yet and I already have a question. I bought it with 512 RAM. It takes 3GB correct? Can I expect any better performance if I use the dual channel DDR2 over standard DDR2? Does the iMac accept dual channel DDR2?
Would I void my warranty if I upgraded the HD on the iMac? Is it easy to do if I tried?
Bryan
 
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15in i7 MacBook Pro, 8GB RAM, 120GB SSD, 500GB HD
Yes, you will be voiding your warranty if you replace the HD.
 
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Dual channel is to do with the motherboard, not the memory.

Any 667 DDR2 SODIMM should work.
 
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bryphotoguy
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one more question

Can I install the RAM without voiding the warranty?
If not, can I bry RAM and bring my iMac and the RAM to an authorized reseller to install it? Or do I need to purchase their overly expensive brand?
 

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