Questions about Samsung 9100 PRO

Is this 4TB SSD fitted with chips on one or both sides? Is it compatible with the PCIe 4.0 protocol?

Can you still put it in gen 4.0 to keep the lans for the graphics card?

Per the official manufacturer specifications, this should have a 5 year warranty similar to previous series (which are listed as 5 years on digitec, for example 990 Pro). What is the reason for this being listed only with 36 months (3 years) of warranty?

For Max. Random 4k Read and Write is missing either one K or three zeros. Random Read and Write should be 1850K IOPS and 2600K IOPS respectively.