I used a delidded, binned 7900X from Silicon Lottery that is binned to run at 4.7 GHz on all cores. Typical load temps run in the mid 70's.
There were no issues with the Rampage VI Apex motherboard in the H700i case despite the compatibility filter saying otherwise. The cable management bar just needs to be in the farthest forward position prior to installing the motherboard.
The FTW3 was purchased as the standard air-cooled version, and upgraded to the hybrid cooler. Thermal Grizzly Kryonaut was used in place of the stock TIM.