Is possible to install Ati HD 6670m (iMac 2011 21,5) in iMac 27 late 2009??

Gianca90

macrumors newbie
Original poster
Nov 5, 2013
3
0
Hi all, I'm from Italy, so sorry for my terrible english.
As the question in the title, I've done some research and this is what I have found. My intent is to install this video card into the iMac late 2009 with hd4670.

First seems that Imac 27 uses a MXM-B connector and 21.5 uses MXM-A Connector FONT.
Infact my HD 6670M 512MB has MXM-A Connector, and have 70mm lenght and 82mm width!

From WIKIPEDIA says that MXM-B IS RETRO-COMPATIBLE WITH MXM-A (not viceversa but is not my case).

So if my suppositionsare correct; can I install the 6670M in iMac 27 late 2009? There is any software incompatibility?? Thanks in advance!

Sorry for english again! P.S. My question is about only to install this video card on this Imac, don't reply with other video card suggestion! THANKS :)

P.S. From Ifixit there's an image of the motherboard of iMac 2009; and it is very similar to the imac 21,5 motherboard with ati 6670M
 
Last edited:

joe-h2o

macrumors 6502a
Jun 24, 2012
997
445
Did the new video card come out of another Mac? If it didn't (i.e., if it is a card from a PC) then it is unlikely to work because it won't have EFI.

The firmware on the card needs to be Mac-specific for it to be able to boot.

The Mac Pro can boot without this firmware (the screen is just black until OS X boots up), but the iMac will just fail the boot test and refuse to boot up unless it has an officially Mac-compatible card. This means finding a donor card from another iMac, or flashing the ROM on the new card with a Mac firmware, assuming you can find one that will work.
 

Gianca90

macrumors newbie
Original poster
Nov 5, 2013
3
0
Did the new video card come out of another Mac? If it didn't (i.e., if it is a card from a PC) then it is unlikely to work because it won't have EFI.

The firmware on the card needs to be Mac-specific for it to be able to boot.

The Mac Pro can boot without this firmware (the screen is just black until OS X boots up), but the iMac will just fail the boot test and refuse to boot up unless it has an officially Mac-compatible card. This means finding a donor card from another iMac, or flashing the ROM on the new card with a Mac firmware, assuming you can find one that will work.
Hi, yes the 6670m is from my iMac 21,5 2011! So it will be perfect compatible?
 

joe-h2o

macrumors 6502a
Jun 24, 2012
997
445
Hi, yes the 6670m is from my iMac 21,5 2011! So it will be perfect compatible?
It *might* be - OS X has the drivers for it, and it's a specific Mac card so all the signs are positive.

If there's any chance, you have the best possible set of circumstances for it to succeed. All you can do now is actually try it.
 

Gianca90

macrumors newbie
Original poster
Nov 5, 2013
3
0
It *might* be - OS X has the drivers for it, and it's a specific Mac card so all the signs are positive.

If there's any chance, you have the best possible set of circumstances for it to succeed. All you can do now is actually try it.
Yeah sure, Apple doesn't give the possibilities to replace the gpu card, so we never have the 100% guarantee.
But we have right now theoric and practice hardware compatibility and theoric software compatibility.
Thank you!
 

crouchingtiger

macrumors member
Feb 15, 2004
46
19
i know this is an old thread, but I just did this exact thing into my iMac 27 2009 whose 4850 card failed. Works great!
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.