Only Maximus XI Extreme , no Apex-----Z390 Taichi teardownZ390 Aorus Master thermal result in CB R15 , no indication of overclocking involvedSTRIX Z390-E : Onsemi NCP302045 implementation-------MSI slides-------The Z370-A and the STRIX Z370-E / Z370-F share a power design. Reportedly they have a 200W power limit in BIOS. As long as you aren't overclocking the i9-9900K it should respect the PL1 (85W) and PL2 (210W) limits set by Intel.If you already have the board and Asus has the BIOS update for it, I wouldn't hesitate to try a i9-9900K at stock settings.Probably with stock settings and short/long duration power limits set to Intel spec , though I would expect i7-8700K to be closer to ~130W unless it's an AVX load.I would have gone for a Swiftech H360 X3 if it's for i9. ( https://www.swiftech.com/drivex3aio.aspx It's fully copper unlike Corsair's Asetek built solution so you don't have galvanic corrosion risk , have expandability, and have higher thermal conductivity to the coolant.Alphacool is supposed to launch a D5 pump powered Eisbaer Extreme but no word on release date and price. At its current pricing , EK-MLC Phoenix is just really expensive pre-fab watercooling.Video editing and transcoding tends to use AVX instruction-sets on the CPU. Z390-A should be plenty fine for the i7-8086K , when I made the Z390 chart I was keeping i9 in mind with a bit of leeway.We've already seen the Z390 Taichi , Z390 ROG Hero, and Z390 Aorus Master with the i9.When we get a more accurate picture of the boards' performance I will probably adjust the chart accordingly.From RedXFire's testing with i9 on the Z370 K6 I would think the i9 on the Z390 version isn't going to be that great.---------------------------------It is quite risky (at this point without a bunch of reviews) to buy anything lower than a Z390 Aorus Pro/Elite , Z390-A , or the Z390 ACE if you plan to use AVX instructions with an i9.As not everyone is going to drop ~$200 on a motherboard when using an i9, it would be interesting to see the results with the i9 on the :Asrock Z390 Gaming 6 / Extreme4 (I have my doubts)Asus lower end STRIX Z390-H and TUF boards (TUF is basically 8 phases of cheaper Onsemi mosfets , of unknown method to obtain the 8 phases)Gigabyte non Aorus boards (using a push pin heatsink though 10 phases of cheaper Onsemi mosfets)MSI Tomahawk & Edge (I have many concerns about the Tomahawk as it might not be using doublers to reach 8 phases)Right now we don't have a complete picture so unless you need to buy it now I'd wait for more coverage.