The MacBook Pro's are on Navi 14, which is 85W (5300M and 5500M).
The Radeon Pro 580 in the iMac is 150W TDP, which would match the Navi 10 5600M. The 5700M is a 180W part, but it might work. (Note: Apple might be under clocking all these cards so they might not be pulling rated TDP.)
The 5700XT is a 225W part and not sure what the Vega 56 and 64 were pulling in the iMac Pro, but in desktop form it was 210W and 295W, respectively, so 5700XT should be no problem for an iMac Pro.
It sounds like an Apple type thing to do. The 5700XT might work if they down clock it somewhat. But we have to face current iMac reality. The closest thing without a proper cooling system? Is a Vega 48. (Why Mac customers are paying over £400 for something that is out of date when you can get a Radeon 5700XT for much less than that...)
But RDNA1 is more efficient that Vega? And they can fit a Vega 64 in the iMac Pro. (With cooling. And I've read reviews that the 56 and 64 are down clocked in the iMac Pro compared to desktop versions running in towers running at full tilt.)
If the cooling is improved a 'proper' 5700XT could do in there with a slight down clock. RDNA2 is imminent also. So why put the 5700XT in that when RDNA2 is more efficient.
It's 24th of May. WWDC is a month away. iMac has to be 'soon' TM.
Azrael.
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I thought Macs already support the 5700 XT via eGPU. Is that not true? If not, god damn Apple are slow.
I think the 5700XT is supported.
Try 'Barefeats.com' to find out.
Benches of iMac with and without eGPU support there.
Azrael.
To make things harder RDNA2 is coming in September according to new rumors.
It adds to the mix. My cynical self says it will make no have no weight on Apple's decision to offer RDNA1's year old tech' for 'thankful' iMac buyers.
And that we'll have to wait another year before any mainstream Mac £999-£3560 will get RDNA2.
Azrael.
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I think that is a given based on what we have seen with the rest of the Mac line. I think 256GB SSDs will be deleted and replaced with 512GB for the 1TB and 1TB Fusion Drive models for the same price ($100/$200). I would love to see the $2299 5K iMac drop the 2TB Fusion Drive for the 512GB SSD, but it might stick with the 2TB FD with a 1TB SSD being a $100 upgrade (instead of the current $300).
We'll get more SSD options with the usual Apple BTO tax. But it's just a case of what SSD as standard we'll get. *looks to Mini as possible ideas. 256 or 512 gig SSD options and 1TB SSD on the top end model.
*sweeps the Fusion Garbage Drive into the 'Bin.'
Azrael.
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What about the Vega48 in the iMac?
Vega 56 and 64 ran hot. It was very inefficient compared to Nvidia. The iMac Pro has that 'cooling' the iMac hasn't got as good cooling.
The Vega 48 is a custom unit to fit the cooling envelope of the iMac. (We wouldn't want Apple spending some of its Trillion capita or mountain of cash fishing the cooling system on the iMac's pressure cooker they currently have...) So it's probably just a cut down or downclocked version. It's not a bad card. Better than the 580 (which is decent low end card but shouldn't be in an iMac costing £1700+ or a Mac Pro costing £6k...) but the Vega 48 is out of date and the RDNA1 is more efficient that the Vega stuff.
The next gpus in the iMac should be more efficient and more powerful. Whether they reach the heights of a 5700XT in a tower is doubtful. It will be some 5700XT custom job. ala. 'Pro 5700XTA' or some such. With 1/2 to 3/4s of the full 5700XT.
Azrael.
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