Some random thoughts about the new M2 Macs...
The M2 now has six PCIe Gen4 lanes (up from five on the M1), two lanes are dedicated to the integrated NVMe storage controller (ANS), and four are general purpose.
The M2 Pro and M2 Max ditched the not-quite-a-Thunderbolt USB Type-C port, making room for four additional PCIe lanes. They now have a total of 16 PCIe Gen4 lanes (up from 12 for the M1 generation), eight of which are dedicated to the ANS and eight of which are general purpose. That means an M2 Ultra Mac Pro could have at least one PCIe Gen4 x8 slot, or possibly two if the lanes can be decoupled from the unused ANS on the second die. Of course PCIe switches could also be used to support additional slots, but I'm not sure there's much point, especially considering the expense.
The M2 Pro is using four single-stack x64 LPDDR5 packages rather than two dual-stack x128 packages. This probably helps Apple lower the cost on the M2 Pro, as the smaller packages are probably less expensive to produce and much higher volume regardless. I'm pretty sure they're more area efficient as well, allowing Apple to save on substrate and packaging costs. I noticed that the integrated heat spreader is no longer cut out to accommodate the SDRAM packages, so the single-stacks may be slightly shorter as well. I could possibly see a future where they use dual-rank, dual-stack x64 packages, which would enable the same RAM capacities for the Pro as the Max, but I think Apple is fine with the segmentation working out the way it does.
The M2 mini (non-Pro) does use the same Kinetic Technologies - MegaChips MCDP2920A4 DisplayPort 1.4 to HDMI 2.0b protocol converter that was used fo the M1 Macs with HDMI ports.
The M2 mini has made the switch from Intel Thunderbolt 4 retimers to Apple designed chips.
The USB3 Type-A ports on the new minis are no longer using the Parade - Fresco Logic FL1100 PCIe Gen2 x1 to 2-Port USB 3.2 Gen 1x1 host controller and have moved to an ASMedia controller. I couldn't read the exact package markings in any of the teardowns, but it's probably an ASM3042, which is a PCIe Gen3 x1 to 2-Port USB 3.2 Gen 1x1 xHCI. That would significantly increase the bandwidth on the back-end and reduce the oversubscription to virtually nil for those two ports. It would have been nicer still to see an ASM3142 controller instead, providing a pair of 10Gbps Type-A ports, but whatever.
The Wi-Fi 6E module is from USI and is a 2x2:2 solution that can use 160 MHz channels on the 6 GHz band for a link rate of up to 2400 Mbit/s. It is still limited to 80 MHz channels on the 5 GHz band (good for 1200 Mbit/s), and the rather conservative link rate of 195 Mbit/s on the 2.4 GHz band (20 MHz channels, 256-QAM encoding, 3200 ns guard interval). I'm not sure that 6 GHz spectrum is going to be the salvation it's hyped to be any time soon due to FRC requirements. Sharing the exact location of every client with either Qualcomm or Facebook/Cisco/Broadcom in order to use standard power APs doesn't sound awesome to me. I'm also bummed that wider channels have trumped more spatial streams as a way to increase link rates. Every time you double the channel width you double the noise as well, resulting in a lower SNR and reduced range, whereas adding spatial streams gives you 3 dB of MIMO gain. Narrower channels also allow much better spectrum reuse in dense deployments or pretty much any suburban to urban environment these days.
The PSUs are still made by LITE-ON. I'm not sure why the MacStadium blog mentioned the input current, but the output ratings are 14.7 A @ 12.6 V = 185 W for the M2 Pro Mac mini and 12.5 A @ 12 V = 150 W for the M2 Mac mini. Looks like both PSUs are roughly 80 Plus Platinum equivalent.
And because the Accidental Tech Podcast guys seem to debate this with some regularity, according to
Apple's power consumption and thermal output information, the M2 at max CPU load will put out 171 BTU/h or 50 W of waste heat. The M2 Pro will dump up to 358 BTU/h or 105 W. For comparison, the M1 Max in the Mac Studio can put out 392 BTU/h or 115 W, and the M1 Ultra goes up to 734 BTU/h or 215 W. Granted the MacBook Pro parts are probably binned for lower leakage and still somewhat thermally limited by the chassis cooling capabilities, but the TDP of the 14-inch MacBook Pro is still probably around 65-85 W and the 16-inch closer to 85-95 W.
edit: Oh, and the NAND in the new minis is not modular. Although that was to be expected, it would have been a nice surprise to see it on modules, like in the Studio.