Installing RAM for 2011 iMac Question

[BWOracle]

What does Apple mean when they say "These computers will not startup if only a single DIMM is installed in any bottom slot; these computers should operate normally with a single DIMM installed in any top slot."?

This comes from Apple's instructions for installing or replacing memory.

I'd like to install 2 x 4Gb modules in the bottom slots without changing the 2Gb modules in the top slots but this sounds ominous.

 

[Badger^2]

What you want to do will work fine.

Where are you finding these instructions.

 

[BWOracle]

What you want to do will work fine.

Where are you finding these instructions.

Support.apple.com from the Apple.com site. Full article name is iMac (Late 2009) and iMac (Mid 2010): Installing or replacing memory. They apparently apply to all i5 and i7 quad core processor iMacs including 2011.

 

[Steamrunner]

What does Apple mean when they say "These computers will not startup if only a single DIMM is installed in any bottom slot; these computers should operate normally with a single DIMM installed in any top slot."?

Basically it means that if only a single DIMM is installed, in either of the bottom slots (and none in the top slots), then the computer won't start up. However, if you have a single DIMM in either of the top slots, and none in the bottom slots, it's fine.

What you're suggesting would result in all four slots being filled, which is no problem at all.

 

[BWOracle]

Basically it means that if only a single DIMM is installed, in either of the bottom slots (and none in the top slots), then the computer won't start up. However, if you have a single DIMM in either of the top slots, and none in the bottom slots, it's fine.

What you're suggesting would result in all four slots being filled, which is no problem at all.

Thanks