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Upgrading RAM in a new iMac

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dmw16

Diamond Member
i just sold my MBP and replaced with with a Sandy Bridge iMac. I had a 8GB (2x4GB) RAM upgrade that I was using in my MBP and decided to put it in my iMac. I did and everything is running just fine.

But when I tried putting the RAM that came with my iMac (2x2GB) into the machine with the 2x4GB it just beeped at me. Does it matter which slots I put the RAM in? Can I not mix sizes?
 
You should be able to mix sizes. There are four slots, and I will number them 1 through 4 where one is the furthest left and 1 is the furthest right.

How are the 2*4GB sticks currently arranged
How were the 2*2GB sticks arranged
Are you sure you had the new stick fully inserted
 
Here's my best attempt at a diagram:

(this is a view from below looking up)
====Screen====
Bank1/Bank2
Bank3/Bank4
=== Back====

How it came - 1: 2gb, 2: 2gb, 3: empty, 4: empty
What worked - 1: 4gb, 2: 4gb, 3: empty, 4: empty
What didn't work - 1: 4gb, 2: 4gb, 3: 2gb, 4: 2gb

Does that make sense?
 
Yea, I am with you, I thought that they were all in a row.

Ok, what about

2-2
4-4
 
I guess the front and back matters. My 2x 2GB came in the back two slots, and i moved them to the front, and then put 2x 4GB in the back.
 
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