i7-9900k stock is DDR4-2666
so 4000 is a huge overclock, that is why you have to boost the IO and SA voltage, 0.95V and 1.05V is not enough for that OC
and remember, stock DDR4-2666 voltage is 1.2V your sticks of ddr4-4000 RAM have 1.35V - other buy cheaper and with higher voltage they reach 4000mhz too
it can happen that the auto adjustment of VCCIO and VCCSA (and sometimes VDIMM) is much to high - can lead to stability problems
with 4 sticks or 2 sticks dual rank you run in more trouble for higher clock rates and fast memory timings
i would say your choice was a good one, now you have to play a little bit with the voltages and clock rates to learn what is to do to get it running
-> for plug and play you should read Qualified Vendors List of your mainboard next time -> https://www.asus.com/Motherboards/RO.../HelpDesk_QVL/
so 4000 is a huge overclock, that is why you have to boost the IO and SA voltage, 0.95V and 1.05V is not enough for that OC
and remember, stock DDR4-2666 voltage is 1.2V your sticks of ddr4-4000 RAM have 1.35V - other buy cheaper and with higher voltage they reach 4000mhz too
it can happen that the auto adjustment of VCCIO and VCCSA (and sometimes VDIMM) is much to high - can lead to stability problems
with 4 sticks or 2 sticks dual rank you run in more trouble for higher clock rates and fast memory timings
i would say your choice was a good one, now you have to play a little bit with the voltages and clock rates to learn what is to do to get it running
-> for plug and play you should read Qualified Vendors List of your mainboard next time -> https://www.asus.com/Motherboards/RO.../HelpDesk_QVL/
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