Unfortunately, we do not have any information on availability at the moment.

...depends on how much RAM you need. With 2x 16GB, you can add two more of the same RAM and go up to 64GB. Personally, I would take the one in your list, it fits or this one: HyperX Fury RGB (4x, 8GB, DDR4-3600, DIMM 288)

there are two offers from two dealers CHF 470.- (tray version) from Digitec itself Intel Core i9-10900KF LGA1200 Cache Tray CPU (LGA 1200, 10-Core) CHF 616.33 (box version) from Cdiscount (FR) Intel Core i9-10900KF (LGA 1200, 3.70GHz, 10-Core) have a lokk at https://www.toppreise.ch/preisvergleich/Prozessoren/INTEL-Core-i9-10900KF-Comet-Lake-S-10x-3-7GHz-BX8070110900KF-p610666 for other options from swiss shops

K= unlocked, overclocking possible, Intel® Extreme Tuning Utility (Intel® XTU). F= no graphics unit integrated, requires separate graphics card Both are not relevant for gaming and the iGPU can be switched off in the BIOS. But with no F, you have the advantage that you can connect the monitor without a graphics card, which is practical if something breaks.

No, you need a mainboard with the "LGA 1200" socket, the Strix Z390 still has the old "LGA 1151" socket.

It is no longer in stock, so wait. I didn't understand the beginning of your question?

Unfortunately, we currently have no information on when the item will be available and when we will be able to deliver it. As soon as something changes in this regard, we will post it here. Sorry.

yes, they work with daily prices.