I'm looking into hardware for mod, using a desktop FM2 motherboard. @Edhawk expanded my knowledge on the ins and outs and pointed me to the MXM thread on MR. Has anyone used an adapter such as theses examples found on Newegg.
Those HP MXM adapters are designed for use in the HP Synergy rack server. They have a proprietary connection on the rear of the expansion card for connection to the server rack, within a specific Graphics section. I am not sure any HP AIO, Desktop or non-Synergy Server has the connector required for the expansion adapter to work.
Front and rear images for HP MXM Expansion adapter.
What about this riser card?, it's only $550!, obviously I'm not going to pay that. But, it does have PCI Express 3.0 (x16), 4 x DP, 1 x Dual link DVI, 1 x CRT and a 6-Pin Power Connector, can be used in Desktops and Military PC's.
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Or for the more reasonable price of $20 you can get one of these with a PCIe x1 slot. I also have a 2GB AMD Radeon HD7650A lying around somewhere.
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An adapter with a PCIe x16 or x8 adapter would obviously be more likely to work. MacOS should just see it as a discrete GPU. The smaller MXM-A cards require less heat dissipation than the MXM-B cards. But you would really need to think about cooling the card, as an adapter like that would lack any heat transfer elements or a fan.
You would just need to make sure the MXM card was compatible with macOS, the same we do for any other dGPU. Plus that it could drive the system at a suitable level.
I am not sure if your HD 7650 A card is compatible with macOS. I suppose spoofing the device-id would work if it isn't natively supported.
Here are two screenshots showing the cards used in real iMac upgrades (from AMD HD 4000. 5000 and 6000 series cards).
Nvidia MXM cards used in old iMacs (2009, 2010 and 2011)
AMD MXM cards used in old iMacs (2009, 2010 and 2011)
The Newer AMD cards being the better option, but also the ones hardest to source.
The PCIe x1 Riser cards are more akin to usage in Mining Rigs, as the adapters don't have any display connectors. So not really viable for a Hackintosh system. But definitely a more reasonable price.
If someone were thinking of getting one of the x16 riser cards they would be better served looking at an RX 6600 XT, which are currently available for less than the price of just the riser card.
Yes, we discussed this on the 'other site', that Mr thread is awesome!. It looks like this is leading up a dead end, I do have a 2006 Intel core duo iMac that I was hoping to mod with the A320I-K motherboard, I guess It'll have to be the x16 riser.
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