Question i7-870 doesn't see memories

Aug 5, 2019
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Hello, it's my first post and I hope for solve my problem immadiately.

I upgraded my mid 2010 27-inch iMac from i3 to i7-870, but this CPU supports only 2 memory channels but iMac has 4 channels, so CPU see only 2 of 4 installed memories.

How to enable all channels?

I once had the same iMac with the same configuration and saw all channels. After reinstall MacOS iMac stopped seeing them. I think that exists some application.

Please help me I have to solve this question in a short time.

Sorry for my bad English :)
 

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