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Increasing RAM

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My boyfriend has 3GB 6400 DDR2 DIMM memory in his computer at the moment. I purchased another 2GB stick for his computer yesterday for his birthday.

I just wanted to know...do you HAVE to replace ALL RAM in a pc at one time or can I just put this 2GB stick in?

P.S. I will also be installing Windows 7 64-bit on the PC as well to fully utilize his RAM :)
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It's usually a good ideal to match memory but you can use different capacity ram as long as they are the same type.
As long as the 2gb stick you purchased is DDR2 6400 witht he same specs it should work.
The only other issue is if his motherboard will handle that much ram. Is his system a laptop or desktop?
Is it a branded system like Dell, Hp, Compaq and if so what model is it?
I can check the specs and see if it will work for you.
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