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BlindSoul

macrumors 6502
Original poster
May 30, 2010
466
0
Israel
Hello,

I'm interested in upgrading my iMac 2011 RAM.
Now someone has told me I must have my RAM even, and It's not possible to have for example: 2x2GB and 1x4GB. And I must have: 2x2GB and 2x4GB.

Is it true?
Thank you very much! :)
 
BlindSoul said:
I'm interested in upgrading my iMac 2011 RAM.
Now someone has told me I must have my RAM even, and It's not possible to have for example: 2x2GB and 1x4GB. And I must have: 2x2GB and 2x4GB.

Is it true?
Click to expand...
No, it's not true. There may be some slight performance advantage to using matched RAM, but it's not significant enough to worry about.
 
The reason you were tood not to do this is because not using pairs of identical RAM means giving up on dual channel memory mode, which is a whole bit faster than single channel mode. Your Mac will work fine, but it's going to be a bit slower.

Mac Pro's have triple channel, meaning three banks of memory are expected for best results.
 
ExnomenDei said:
The reason you were tood not to do this is because not using pairs of identical RAM means giving up on dual channel memory mode, which is a whole bit faster than single channel mode. Your Mac will work fine, but it's going to be a bit slower.

Mac Pro's have triple channel, meaning three banks of memory are expected for best results.
Click to expand...

And if I buy another 4GB RAM will it work fine?
By fine I mean, The channel thing won't slow it?
 
I see, Okay then I think I might firstly buy 1x4GB and then when I will have more money I will just buy another 1x4GB.

Thank you so much.
 
I have 2 x 2 GB and 1 x 4 GB, no problems at all. Also I didn't notice it slowing down.
 
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