Sure, the Z790 is compatible with 12th-generation processors.
The i9 12900 can be paired with intel 600,700 series motherboards, and intel 600 series motherboards such as Z690, H670, B660, H610, and Z790. The i9 12900 suffix does not have K, indicating that it does not support overclocking, so it is not necessary to locate the highest specifications and support the overclocking of the Z790 motherboard, Z790 motherboard is recommended to consider the model suffix with K 12th-generation CPU and 13th-generation processor.