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My current machine has 3 GB RAM, one 1GB stick and one 2 GB stick. If I buy another 2 GB stick, does it have to be the exact same brand as the 2 GB stick already installed? Or can they be different brands and still be identical (DDR2, etc)?

I'm looking at the 2 GB options on this page for a Dell 1735: http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&Configurator=MemoryConfigurator&CFG=CFG001M595821|1735&DEPA=0

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up vote 3 down vote accepted

I'm pretty sure they have to be the same size and speed, but not necessarily identical.

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Yes, with the same timings. +1 for you. – user3463 Dec 9 '10 at 0:07
    
note: there are a lot of little parameters about RAM that should match timing/cs. it is possible to use non-identical sticks, but I always order from kingston so I can get identical sticks and lessen my possible headache or picky mobos...+1 just the same as you are technically correct – RobotHumans Dec 9 '10 at 0:26
    
The best kind of correct! – tsilb Dec 10 '10 at 19:47

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