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I can't POST to Boot/OS when i added a new ram, corsair vengeance 1866mhz 8GB

I have buy new Corsair Vengeance 8GB DDR3 Ram with speed 1866MHZ, but when i installed it to my Motherboard, the PC won't POST, it just turn on & off again and repeat it again again without i switch it on. I have also Corsair Vengeance 4GB 1600MHZ x 2 on the Ram Slot. When i remove the New ram, its Can Post & boot to OS. And i did try used the new RAM only, still the same thing happen. so i bet its not the MOBO, but the Ram?

The questions is, is the RAM really fault? or i need to change XMP setting? or is it not compatible with my other RAM or MOBO?

My PC spec as shown below:
Intel Core i7 4770K Run in stock speed, @3.5ghz
8GB DDR3 Corsair Vengeance 1600mhz
850watt Corsair PSU
Cooler Master Trooper case
ASUS Nvidia Geforce GTX 760 2GB GDDR5 DCII OC
500GB Corsair nuetron SSD
Maximus VI Formula LGA 1150, bios latest version.
2 answers Last reply Best Answer
More about post boot added ram corsair vengeance 1866mhz 8gb
  1. Heaven Reeve said:
    I have buy new Corsair Vengeance 8GB DDR3 Ram with speed 1866MHZ, but when i installed it to my Motherboard, the PC won't POST, it just turn on & off again and repeat it again again without i switch it on. I have also Corsair Vengeance 4GB 1600MHZ x 2 on the Ram Slot. When i remove the New ram, its Can Post & boot to OS. And i did try used the new RAM only, still the same thing happen. so i bet its not the MOBO, but the Ram?

    The questions is, is the RAM really fault? or i need to change XMP setting? or is it not compatible with my other RAM or MOBO?

    My PC spec as shown below:
    Intel Core i7 4770K Run in stock speed, @3.5ghz
    8GB DDR3 Corsair Vengeance 1600mhz
    850watt Corsair PSU
    Cooler Master Trooper case
    ASUS Nvidia Geforce GTX 760 2GB GDDR5 DCII OC
    500GB Corsair nuetron SSD
    Maximus VI Formula LGA 1150, bios latest version.


    From specifications of your mobo:
    Memory: ......1866(O.C.)/1800(O.C.)/1600/1333.....
    (O.C) means overclocked.
    You old memory runs on 1666 which is not overclocked - supported by mobo, but new one need to be overclocked in bios, which means it's probably wants higher voltage. Try to increase a little bit voltage for memory and then put new memory stick (1866mhz).
  2. Best answer
    Mixing DRAM can be problematic, try booting with only the 8GB new set (if a pair of 2x4GB 1866 then in slots 1-3, if it's a single 8GB stick try it in slot 1 and boot to BIOS, manually set the freq to 1600 and the timings initially to 9-9-9-24 and see if that boots OK, if so add the 2x4GB sticks in slots 2-4 (if the new is a 2x4GB else in 3-4 if the new is a 1x8GB) and try booting to BIOS, let us know what happens, if no joy we may need voltage/timing adjustments so provide the actual model numbers of the DRAM
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