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RAM speed for gaming (2400, 2666, 2800 or 3000 MHz)

My CPU is i5 8400, mainboard is Gigabyte Z370XP-SLI, VGA is MSI GTX 1080. Which RAM ( (2400, 2666, 2800 or 3000 MHz) I should invest in for best price/performance in gaming and daily office work. I also need this system to be futureproofed in at least 3 years. Thanks.
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More about ram speed gaming 2400 2666 2800 3000 mhz
  1. With a locked 8400 I'd go with 2666 , higher may run but not guaranteed.
  2. SR-71 Blackbird said:
    With a locked 8400 I'd go with 2666 , higher may run but not guaranteed.


    Does it mean 2666Mhz is the minimum I should go with? And what're the factors that I should check if choosing higher ones.
  3. Best answer
    Locked CPU's can't go as high normally 8400 is locked and intel list 2666:
    https://ark.intel.com/products/126687/Intel-Core-i5-8400-Processor-9M-Cache-up-to-4_00-GHz
    But sometimes you can go a little higher , like 3000 , but nothing above 2666 is guaranteed.
  4. SR-71 Blackbird said:
    Locked CPU's can't go as high normally 8400 is locked and intel list 2666:
    https://ark.intel.com/products/126687/Intel-Core-i5-8400-Processor-9M-Cache-up-to-4_00-GHz
    But sometimes you can go a little higher , like 3000 , but nothing above 2666 is guaranteed.


    Thanks for the info. In case I upgrade the CPU to Intel i5 8600K, what's the optimal RAM speed I should go with?

    P.S: just a side question if you don't mind... is it really worth to upgrade CPU to unlocked version :-? Thanks again.
  5. Go with the Memory QVL list on the Motherboards site , to get tested and known working higher rated sets.
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