so i am planning on building a new computer come this fall once these last 3 parts release  ( hopfefully by black friday i'll have come nice sales, but with new parts i doubt it)
 
 this is what im current planning on getting
https://docs.google.com/spreadsheets/d/1p8O91LVcITEtPWXnn4LRVkEynz8hXoQGySMRRxEKtFs/edit#gid=0
 
and i am hearing about the z790 supporting pcie 5.0 for the m.2
 
 now operating under the basic assumption that 4080 will support pcie 5.0
 
 two questions
 
  do we have any news on when the new samsung pcie 5.0 m.2 hard drives will release?
 i keep hearing about z790 support but nothing about the drives themselves
 and
 i have been hearing things about  the current cpu not being able to support 2x pcie 5.0 devices.
 
 what with that.. i dont understand why.. im assuming   the raptor lake and the z790 will be able to support as many pcie 5.0 slots as are on the mb..
why would it be otherwise?

SwiftKitten
 and
 i have been hearing things about  the current cpu not being able to support 2x pcie 5.0 devices.

You have to understand how the hardware works. PCI Express is a point-to-point topology. Just because the CPU advertises 20 lanes doesn't mean they all are 5.0, they are not. The same is true for most chipsets. Alder Lake (the 12900K) only has 16 PCIe 5.0 lanes, and four PCIe 4.0 lanes onboard. The 12900K does support a dual slot PCIe 5.0 x8+x8 configuration but it depends on the motherboard itself to physically wire the PCIe slots that way. Obviously doing so adds to the cost of the board.
 
PCIe 5.0 is expensive, hot, and still mostly esoteric right now. Outside of server workloads and certain productivity/content creation applications PCIe 5.0 SSDs aren't useful to a regular consumer, they're just bragging rights. M.2 SSDs are already thermal limited with PCIe 4.0, so making them even hotter with PCIe 5.0 will just thermal limit them all the more.