iMac27, Mid2011 Project

[RedStarOne]

Hello,

I want to upgrade my iMac27 (12,2) with

a new Grafikcard! NVIDIA GTX860M and

a new CPU! i7-3770 (Ivy Bridge), and replace

the old GPU! With AMD Radeon HD6970M

and the old CPU! i5-2400 (Sandy Bridge),

from iMac27 (12,2) to iMac27 (13,2) BUT!

How? Can I do this?

Can I download the firmware from the iMac27 (13,2)

and replace the firmware from my iMac (12,2) or is

this not possible, because of the "wrong" iMac?

Because I have build the i7-3770 CPU! In my iMac,

it is the same Socket H2 (1155) but NO! Boot any more,

I think! Of the missing CPU-ID in the firmware of (12,2)

I'am right? Or NOT !?! Or how? Can i edit the firmware,

and ad the CPU-ID for all Ivy Bridge CPU's by myself,

with an APP or program! But with program I need?

And the second test! Was to build the GTX860M in my iMac

(MXM-Module) change, it is SIMPLE! But it boot's UP! But no

picture, just a black screen! But boot is WORKING! I have hear it,

with voice over! I think, the PROBLEM! Here was the missing!

Driver for my GTX860M, because I have not installed

the NVIDIA Web Driver, is this also right !?!

And I have also solved! The problem with the broken! HD6970M

with become! stripes or a blank screen, because of the heating!

OVER! Heating the GPU! This problem is known! Ok.

I don't want to OPEN! My iMac27 twice again, before I know, if

THIS! Konfiguration will WORK! So my question is, can this! will

be working! With a Web Driver! The newest for El Capitan (15G22010)

or have I Update to Sierra first, and then with the new GTX860M to

Mojave, because! Of the missing support for the HD6970M GPU!

So PLEASE! Give me a answer, THANK! You.

Greets

RedStarOne.

[MaLd0n]

reset nvram command+option+p+r and reset smc too, check manual

[RedStarOne]

How? and why reset the SMC too?

Will this! ONLY! Make my iMac27 (12,2) working

with a new CPU (i7-3370) and GPU (GTX860M) ?

Then it is really SIMPLE! Is this "truth" ???

greets

JOEL Kind.

[MaLd0n]

just Power Mac and press command+option+p+r

smc u need read manual