There are rumors that report the M7 is being fast-tracked to supersede the M6 within a shorter than normal time frame.
Fast tracked or just skipping M6 Pro/Max that cannot afford to do?
Decent chance the 'missing' M6 Pro/Max are more because the Server chip is using M6 tech (or M5 tech), not M7 and needed more work.
M6 is suppose to be N2 process.
" ... At least a trio of companies are believed to be involved with the chip. Apple is said to be handling the overall design of the chip, while Broadcom is said to be providing some networking technology for it. TSMC is expected to begin mass production of the chip in 2026, using its third-generation 3nm process, known as N3P. That is the same process expected to be used
for the A19 chips in the iPhone 17 models next year. ... "
https://www.macrumors.com/2024/12/11/apple-intelligence-servers-new-chip-report/
The substantive issue with the sever chip is that it isn't just Apple making the chip. Broadcomm is in the loop also. Apple will have to coordinate with them. Server chip going into production 2H 2026 wouldn't surface until 2027.
If Broadchip has a chiplet and Apple has a chiplet that are both part of the package , then going to have issues willy-nilly substituting something else in their mid-stream in the R&D process and still hit the same sizes , costs, power efficiency were targeting.
From the lead entries link about Baltra
"...
The server chips that Apple is working on are part of its "Baltra" project, and the chips are expected to be finished by 2027. Apple is working on multiple types of chips, including those with double, quadruple, and eight times the number of CPUs and GPUs as the current M3 Ultra. ... "
I’d wager Apple scrapped the M5 Ultra as a basis for their “Baltra” AI server chip and instead jumped to the M7 architecture.
Since the M7 Ultra isn't suppose to come until 2028... that really isn't going to help in the next year or so.
Very likely that these server chips are more expensive and complex to product then the M7 Ultra package will be.
Broadcomm isn't going to sell they contribution at rock bottom prices or free. So very likely those features are not in the M7 Ultra. ( the networking that the Mac Studio needs to do is nothing like what Apple is going to need for a more competitive sever chip. )
In the meantime, they chose to go with Nvidia to run their AFM3 Cloud Pro model util this new chip is finished.
Apple's better server chip probably isn't going to lighten the load of their "AFMx xxx Pro" workloads.
The server chip likely is going to be so that can handle higher amounts of the "non Pro" foundation models at higher inference user rates in the data centers that Apple has now. Very energy efficiently scaling in their current data center footprint. Not trying to build more buildings than Google Cloud.
If the AFM non-pro models are successfully adopted over 2027-2028 there will be a bucketload of just that inference work to handle.
Reportedly the Apple Private Cloud Compute server utilization levels are crazy low at the moment , but that is because the adoption rate is also crazy low. Decent model that should radically change the amount of workload.
Decent chance Apple is still going to outsource the most exterme compute because not going to all that 'Green energy'. The current iCloud servers already use Google Cloud ( and AWS and Cloudflare and etc.). Apple regularly outsources scaling compute to 3rd party vendors all the time. It is their standard operating model. "AI" isn't going to change that.
This could also be the reason the new AI server chip has supposedly been delayed.
Scarcity of wafer starts. Scarcity of packaging processing slots. Lack of RAM modules available to buy.
While the M7 Ultra might not be ready until 2029 for Macs, the “Baltra” server chip based on the same generation could be tapped out years before it.
The biggest 'flaw' in the current Apple PCC SoC solutions is I/O and networking; not 'AI compute'. the baseline M7 architecture is likely not some magic bullet for those issues.
Ternus is a hardware guy, so I’d expect them to get really aggressive about it out the door and into data centers. The deal recently made with Broadcom backs this up as well.
The deal with Broadcomm is to back up talent they Apple does not have excess of. There are a number of folks that left the Apple Silicon group to do projects elsewhere. Nuvia is one. There are about 2-3 other start-ups chasing alternative compute servers that folks from Apple ran off too.
Apple really isn't into maximum data center focus. iCloud is not solely run with just Apple servers. Termus is more a 'product guy" than a "hardware guy". Apple's services business is certainly growing but that isn't a "physical product for sale" business.