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Guest Eug

Apple's 24" iMac apparently uses MXM

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Ice-Tea
According to macgeneration the new 24 inch iMac uses MXM for its 7300 GT and 7600 GT.

Can anyone confirm this? Is this standard MXM?

---

Eug @ Everything Apple

No :)

We'll have to wait untill someone cracks her open :)

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mobilenvidia

There is no go7300 GT, I doubt it would use desktop GPU's on an MxM type board.

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Ice-Tea

I googled some pics of the Apples insides. No MXM :)

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Guest Guest
There is no go7300 GT, I doubt it would use desktop GPU's on an MxM type board.

Is there a reason this is not possible? Just wondering. The 24" iMac doesn't actually need a laptop GPU. It can use a slower desktop GPU, since it is a desktop after all (even if it does use a laptop CPU, and it looks kinda like an oversized laptop in design).

I googled some pics of the Apples insides. No MXM :)

The 24" iMac came out yesterday. I haven't seen any pix of its insides yet, and nobody seems to have an actual unit yet either. Thus, any internal pix would have to be from the service manual, and I haven't seen that online yet either.

I'm pretty sure the 20" and 17" models use a different design for the GPU. The 24" is the only one with an nVidia GPU, and it's the only with a GPU upgrade option. The 20" and 17" models use the Radeon X1600 or else Intel GMA 950, soldered to the motherboard AFAIK.

Maybe macgeneration got the type of daughter card wrong, but I figure if it's nVidia, there's a good chance it's MXM.

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Fabrice Roux

If it's done Apple all the way be sure it will be a Quanta like MXM... (read physically MXM but not compatible with other MXM graphic cards)

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Guest Eug
If it's done Apple all the way be sure it will be a Quanta like MXM... (read physically MXM but not compatible with other MXM graphic cards)

Yeah, I could see that happening. Then again, that's better than nothing. If it's feasible, a 3rd party might step in and release upgrades. BTW, the CPU is likely also upgradable. Or at least it was on the previous Intel iMac models.

We need the Kodawarisan people to get one of these 24" iMacs asap to disassemble. :) I ordered one, but there is no way I'm disassembling mine. :)

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Ice-Tea
Yeah, I could see that happening. Then again, that's better than nothing. If it's feasible, a 3rd party might step in and release upgrades. BTW, the CPU is likely also upgradable. Or at least it was on the previous Intel iMac models.

We need the Kodawarisan people to get one of these 24" iMacs asap to disassemble. :) I ordered one, but there is no way I'm disassembling mine. :)

Yeah, it were his pictures I saw, so my appologies for the disinformation.

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Ice-Tea

Updated the frontpage with pictures of Aplle's 'kinda' MXM solution.

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Fabrice Roux

It looks like MXM, it smells like MXM, it taste like MXM... but it is likely to be a new Quanta proprietary MXM.

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Ice-Tea
It looks like MXM, it smells like MXM, it taste like MXM... but it is likely to be a new Quanta proprietary MXM.

These words sound strangely familiar :)

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Ice-Tea

Got some new info. Looks like the cable goes to a temp sensor on top of the heatsink, so no problems :)

Also: it looks like they are using a desktop 7600GT, which means plenty 'o' juice for notebook parts :)

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Fabrice Roux

*rolls eyes* thermal sensor on the heatsink... why o why... now that the GPU comes with throttling capability there is no point in hardwiring the thermal sensor logic at that stupid position.

The best would be to use the internal thermal diode which gives more accurately the chip temperature.

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Ice-Tea
*rolls eyes* thermal sensor on the heatsink... why o why... now that the GPU comes with throttling capability there is no point in hardwiring the thermal sensor logic at that stupid position.

The best would be to use the internal thermal diode which gives more accurately the chip temperature.

I dont't know whether desktop GPU's feature the same throttling as notebook parts do :)

Perhaps that's why? Or maybe it's just Apple being Apple :)

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Ice-Tea

Cleaned up some spam. Figured I might update the thread while i'm at it :)

So, normal MXM cards do not work in Apples. Send a card to a 24" owner, no dice.

Basically, while it seems close enough, it's not a MXM card. It's just another Aplle format.

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Guest Renee Cousins
Cleaned up some spam. Figured I might update the thread while i'm at it :)

So, normal MXM cards do not work in Apples. Send a card to a 24" owner, no dice.

Basically, while it seems close enough, it's not a MXM card. It's just another Aplle format.

It's the ROM, the MXM cards do work in BootCamp - verify if the Flash is 64K or 128K and if its 128K flash it with a ROM ripped from a Mac consumer line equivalent card.

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Ice-Tea
It's the ROM, the MXM cards do work in BootCamp - verify if the Flash is 64K or 128K and if its 128K flash it with a ROM ripped from a Mac consumer line equivalent card.

Isn't it the other way around?

Anyways, shipped him a 6200. Has 64k ROM as far as I can see. Problem is I don't have any bioses handy for mobile nVidia GPU's for Apples :)

I'm perfectly willing to work with anybody who wants to give it a go, but this is basically above ly head.

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Guest Guest
Isn't it the other way around?

Anyways, shipped him a 6200. Has 64k ROM as far as I can see. Problem is I don't have any bioses handy for mobile nVidia GPU's for Apples :)

I'm perfectly willing to work with anybody who wants to give it a go, but this is basically above ly head.

Hmm, I think the 128K was only needed historically. I'll check in a minute, but it seems my 7300GT ROM image is only 61KB - I'll put it here for anyone who wants to disect it.

My guess is that the problem is EFI support. When booting to Windows through Bootcamp, the Mac will run the EFI-BIOS extensions that are in the 200MB partition, allowing Windows to boot, and, again I'm guessing, also allowing the video card to initialize through normal BIOS calls.

When it boots into OS-X, it skips this initialization step, and does not initialize the BIOS extensions, and therefore the graphics card does not have the chance to start up because it does not have the code to operate through EFI.

I'm sure someone who's savy with ROMs and assembly code would know the difference. Considering the crappy performance of the 7300GT (and the so-so performance of the 7600GT in the "high end" iMac), it would be nice to have the choice of upgrading to a better card.

mac7300GT.rar

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Ice-Tea

I only understand about half of what you're saying :)

But I'd say that if you have a 7600GT, you'd better wait untill DX10 cards before even considering an upgrade. A desktop 7600GT probably is not thát much worse as a Go7900GS

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anewsome

Any update on this? We are certain that iMac 24 inch does not use MXM card? Has anyone been able to source an upgrade for 24 inch iMac that does work?

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hisse

It doesn't seem to be a very active topic, From what i understand from this thread it seems(if I read correctly) that mxm cards work fine under bootcamp to windows since it uses a system bios to run windows thus enabling the graphics card to run. But under OS X using EFI only mac cards will work(justifiably since they're the only ones made to handle it). Is this correct or has some of the stuff in here been inaccurate?

If that is true it is also reasonable to assume that you could switch an apple card with an apple card if you could get your hands on one? So like order with 7300gt upgrade to 7600gt later(not really worth it). But for example say a model or two down the road if they still use MXM and they have new DX10 cards in the imacs wouldn't it also be reasonable to assume based on this information that one of those cards would work in the current 24".

Now this is just an assumption based on what I've read in this thread. Getting your hands on one of the cards may be a pain in the arse if it was possible to do the switch but I could almost guarantee that Apple isn't making the cards so who is? And if you could find that out would they be willing to sell the chips?

Please correct me if I'm wrong.

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Ice-Tea

That sums it up pretty nicely :)

While you are right to assume Apple does not make their own cards, chances of acquiring one directly at the source are nil. Two reasons.

1) In Taiwan they laugh their arses off if you go ask them a single card. Actually, they are still laughing when you ask one hundred. Around 1k+ they start to wake up.

2) These cards are made for Apple. They are not allowed to sell cards to anyone but Apple. It would be the same thing as going to Foxconn to get some iPods. Doesn`t work.

So, two options:

1) Upgrade with an Apple card, if they stick to the format and if they are compatible.

2) Get a non-Apple card and find/engineer a suitable bios

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Guest Guest

it looks like the new imacs have MXM radeons, hopefully someone will find some supply of those for swapping... I got a refurb 24" so didnt have the video option, but would love to try if it's possible.

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Guest -TiLT-

I wonder, if parts of the osx86-project could help here. They figured to have full HW-support on non-Apple gfx-cards on their hacked osx. Maybe, these drivers could help to make normal MXMs run in Apples 24" iMac.

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Asbjørn Ulsberg

As I wrote in the topic Upgrade the Apple iMac's ATI Radeon HD2600 Pro, I'm thinking of buying a new iMac equipped with a Radeon HD2600 Pro. I probably won't upgrade the video card instantly, but if a better card becomes available and isn't close to impossible to install, I'll do it eventually. I'd love more information about whether it's possible to upgrade, if the recent EFI update perhaps fixes some issues and whether a better MXM-based card even exists.

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