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Helpful answers
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Jul 24, 2012 7:06 PM in response to Wendy Byleby RatVega™,It will work, but the performance may not be as good as using matched sets of RAM.
I'm honestly not sure how the newer processors are at handling asymetrical memory arrays, but "good practice" has always been to work in pairs, as in: Keep two 1GB dimms and add a pair of 2GB or 4GB dimms. or, just add one more 1GB dimm.
But it's your circus, you can have as many clowns as you like...
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Jul 24, 2012 7:44 PM in response to RatVega™by Grant Bennet-Alder,★Helpful"Matched pairs" is optimum for 2008 and earlier.
In 2009 and later, optimum is (any size) triples.
The penalty for installing two or four is small, probably about five percent in memory testing. The real-world penalty for that mis-match is probably negligible.
Slots 3 and 4 are "shared". Install the big one in slot 1 (or 2) but not 3 or 4 or the memory wizard will yell at you, and tell you to change it.
Some 4GB and larger DIMMs do not play nice with other, smaller DIMMs.
So be certain to buy from a Mac-centric vendor who can tell YOU what will work in your Mac, guaranteed or your money back. Lifetime replacement warranty is the standard. Don't settle for less or you may end up owning some excellent DIMMs that do not happen to work in your Mac.
Your Mac Pro (65 lb. tower) uses Error-Correcting-Code (ECC) memory. Installing non-ECC memory is not a good way to save money in the long run.
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Jul 24, 2012 8:19 PM in response to Grant Bennet-Alderby Wendy Byle,So I can put the 4 GB in slot one and the other 3 in slots 2, 3 & 4 and it should be okay?
I'm buying from Crucial.com. When I had my G5 their memory worked fine and they're guaranteed or money back.
Thank you!
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Jul 25, 2012 6:47 AM in response to Wendy Byleby The hatter,Install Memory
http://support.apple.com/kb/HT4433
http://macperformanceguide.com/Reviews-MacProWestmere-MemoryBandwidth.html
http://macperformanceguide.com/Mac-MacProMemory.html
http://www.barefeats.com/nehal02.html\
Depends on what you use, ,7GB is better but hardly going to do more than get off the ground for most users and apps. CS5/6? try 3x8GB instead.