@W1zzard please correct:
"As of this writing, Intel decided against launching the H670 client chipset, " - launched and shipping
". The H610 is the bare entry-level chipset. You lose out on memory overclocking, only get Gen3 PCIe connectivity across the board, and no CPU-attached NVMe."
Every H610 motherboard has PCIE 4.0 x 16 slot. M.2 connectivity is where you lose out, as it's indeed limited to PCI 3.0 (x4 for the first M.2, and x2 for the second, found only on the Asus Prime E/A).
I also found the article slightly confusing because all the graphs contain three bars, which I don't think are explained anywhere?
These are:
Red: DDR5-4800 CL40
Green: 2.5/4.4GHz
Blue: Power limits removed
I assumed the green was DDR4, because I didn't think anyone would be crazy enough to pair this thing with DDR5 RAM, but I checked more, and I guess in fact Green is the $550 RAM you used (DDR5-6000, CL36), and DDR5-4800 represents the manufacturer's max specs for the chip (hence DDR5-6000 is overclocked), but I'm not really clear why the CL has been reduced to CL40. At any rate it would be a lot clearer if it said DDR5-6000 CL40 for the green bars, instead of 2.5/4.4 GHz, which are just the manufacturer's standard specs, so not really a variable here.
In terms of the RAM recommendations, " My recommendation would be a DDR-3600 CL16 kit—easy to acquire and super affordable." , it looks like for 2x8GB/2x16GB:
* DDR4-3200 CL16 - $51/$98
* DDR4-3600 CL16 - $78/$154
It's not really clear to me that this is worth it or not, having chosen the cheapest CPU in the line-up, to spend 50% more on RAM?
Further, we could note that if you DID buy the 3200MHz RAM, then it would run at max speed with an H610 motherboard, which is $40 cheaper than a B660, and given the fact that you find almost no performance advantage from lifting the power limits (impossible on the H610?), then this chip becomes in the real world a lot more sensible because it doesn't really seem that great to spend $150 on a board for a $180 CPU and say it's far cheaper than a (faster) $280 CPU with an $80 board.
The price of the motherboards seems to be the elephant in the room, where with the launch of the 5600X you could use an existing motherboard with new BIOS, whereas for this you are forced to use a new generation board which will cut out a lot of the price savings.
I mean.... The B660 is definitely better than H610, but when you are buying a cut-down chip then you are obviously trying to save money, so I expect to see a bunch of pre-built PCs with 12400f + H610m.
The other point, incidentally, that I'm trying to figure out is which CPUs do end up throttled by the power limits (117W across the i5 non-k chips). The IGP is rated at 15W? So maybe an i5-12500/12600 (non-k) would be throttled during gaming on IGP?