Imac memory upgrade

[mhurley]

My old 2010 Imac died recently so I bought a newer 2017 model.
I've taken the memory out of the old Mac
The new Mac has 8gb, and I've got 4gb from the old one
I understand that the old memory runs at a slower speed than the new memory but if I add the 4gb to make 12gb will the machine still run faster overall?

Thanks

[Bikerjon]

Forget it, the iMac most likely wont even boot if you were to try it! The RAM modules are completely different spec.

You can buy a Crucial 8GB kit (2X4GB) for about £40 delivered on Amazon

[mhurley]

ok thanks for the info

[andygo]

I have just put a 16gb memory upgrade in from Crucial, Very simple and the Imac runs better.

You can only do memory upgrades on a 27" imac, the memory is soldered in place on a 21" version.