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I think with these Maximus formula boards you can flash the bios even if the board won't post due to the CPU. Not 100% sure but... pretty sure. So it should be fine. Worst case OP might have toLooks like you may need it updated to the 1704 bios revision at minimum.
Why would they bother buying it, if that was their plan?
I think the only concern would be the power draw/provided, if its insufficient it'll be unable to achieve it's maximum overclock.I have the latest BIOS, which is 1801. I read elsewhere, though, some said the Z370 holds back a portion of performance somehow, making it slower than any Z390 boards. I'm undecided now with that finding.
I'm currently running this exact combo, but may upgrade to the 390 Dark here shortly once I see a few more reviews on it. It works as long as you have the bios updated; I'm not sure as I'm still playing with it, but I think I have a bum 9900, as the stable overclock on a overkill custom loop is mild (4.8 all), and I cannot get xmp (even after pumping more voltage I am comfortable with into the memory, vsa and vccio) to work on the 9900 at all when it worked without any problems on my 8700 just fine. My memory max after bumping up the relevant voltages I can get is 2800 at voltages I could get 4k with on with my 8700. My next weekend in 2 days I'll be reseating the cpu and trying again, if any improvement I'll let you know, as I don't know if it is a weak cpu or poor mobo compatibility.
I had the same weird results as you with that exact MB + CPU combo. Swapped out the board for a new MXIF and all the problems and weirdness went away. My take is the 9900K can work in a Z370 board at stock clocks, but if you want to push it at all, you need a Z390 board and its better power delivery.No joy, reseated the 9900 and no improvement, it is either a horribly bad chip or bad compatibility. I can't figure out why it barely hits above jedec standards(2666) with looser timings and higher voltage than should be needed(can't get my ram higher than 2800mhz no matter what I try).
I had the same weird results as you with that exact MB + CPU combo. Swapped out the board for a new MXIF and all the problems and weirdness went away. My take is the 9900K can work in a Z370 board at stock clocks, but if you want to push it at all, you need a Z390 board and its better power delivery.