RAM all over the place
October 30, 2009 8:10 PM Subscribe
RAM configurations for the new iMacs - permutations galore!
posted by VikingSword to computers & internet (12 answers total) 2 users marked this as a favorite
I'm going to be buying a new quad iMac probably sometime in January 2010 (either the i5 or i7, I have not decided as yet, I'm waiting on reviews and tests). I will be buying it with the stock 4GB RAM, and I'll buy more RAM on my own and install that. However, I'm not clear on a few issues with optimal RAM configurations. The new iMacs have 4 RAM memory slots, and the stock configuration is two 2GB sticks (2GB + 2GB). There's a BTO option of getting additional 4GB RAM in one of two configurations, as 2GB sticks, so the end result would be 2GB+2GB+2GB+2GB=8GB, or two 4GB sticks, so the final configuration would be 4GB+4GB=8GB (much more expensive). Now, come January if I'm lucky RAM prices might drop, but regardless, it will still be cheaper to buy RAM myself and install it, instead of buying from Apple BTO. Issues:
1)Is there a performance penalty with 2GB+2GB+2GB+2GB=8GB versus 4GB+4GB=8GB? I realize that there is an expansion difference, in that using the 4GB sticks, I leave myself the option of upgrading to 16GB.
2)Is it possible to do: 2GB+2GB+4GB=8GB or is it contraindicated to mix 4GB sticks and 2GB sticks? If it's possible, is there a performance penalty vs 4GB+4GB=8GB?
3)Similarly is it possible to do 2GB+2GB+2GB+4GB=10GB or is there an issue? It is my understanding that as Apple has it configured, both the i5 750 and the i7 860 are dual channel Lynnfields, and the i7 is not 3 channel (1156 socket)
4)And again similarly what about 2GB+2GB+4GB+4GB=12GB
5)Final option, what about 2GB+4GB+4GB+4GB=14GB.
Of course, my decision will be driven by pricing, and this may pertain to quite some time down the road, so I may add gradually over the course of a year depending on prices. Thanks!