Jun 19, 2020
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Hello , this are my pc specs:

Gigabyte z490 Gaming x
i5 10400
Thermaltake Toughram 2x8 3200mhz

i already try set the xmp profile to 3200 MHz and it works, tested with cinebench r20 and windows memory diagnostics, my question is if i can use the 3200 MHz profile with the i5 10400, i didnt realize before but in the gigabyte web site under the mobo specs said:
  1. Intel® Core™ i9/i7 processors:
    DDR4 4600(O.C.)/ 4500(O.C.)/ 4400(O.C.)/ 4300(O.C.)/4266(O.C.) / 4133(O.C.) / 4000(O.C.) / 3866(O.C.) / 3800(O.C.) / 3733(O.C.) / 3666(O.C.) / 3600(O.C.) / 3466(O.C.) / 3400(O.C.) / 3333(O.C.) / 3300(O.C.) / 3200(O.C.) / 3000(O.C.) / 2933 / 2800 / 2666 / 2400 / 2133 MHz memory modules
  2. Intel® Core™ i5/i3/Pentium®/Celeron® processors:
    Support for DDR4 2666/2400/2133 MHz memory modules
  3. 4 x DDR4 DIMM sockets supporting up to 128 GB (32 GB single DIMM capacity) of system memory
  4. Dual channel memory architecture
  5. Support for ECC Un-buffered DIMM 1Rx8/2Rx8 memory modules (operate in non-ECC mode)
  6. Support for non-ECC Un-buffered DIMM 1Rx8/2Rx8/1Rx16 memory modules
  7. Support for Extreme Memory Profile (XMP) memory modules
so , the i5 10400 can handle 3200 MHz ram , or something can go wrong?
 
Solution
Intel only rates the 10400 for up to 2666mhz but since you have a z490 motherboard you can run ram above this frequency.

Technically this is overclocking, but it is 100% safe.