Z370m pro4 Failing with 4 sticks of ram

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   Just like the subject says.

My motherboard was running fine with 2 sticks. Went ahead and upgraded and purchased 2 more of the exact same stick. Upon boot up my PC will freeze in windows load screen, even freezes in bios after a few seconds.

It runs just fine with any combination of 3 sticks in any combination of dimm slots.  I upgraded bios and chipset and tried xmp profiles and adjusted dram voltage up to 1.35. any advice would be great!

again all 4 sticks are exactly the same model and manufacturer. 
Corsair Vengeance RGB 2666
RAM model: 

CMR16GX4M2A26666C16

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RanchGuy Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 22 Feb 2018 Status: Offline Points: 3	Post Options Post Reply Quote RanchGuy Report Post Thanks(0) Quote Reply Topic: Z370m pro4 Failing with 4 sticks of ram Posted: 22 Feb 2018 at 2:19am
	Just like the subject says. My motherboard was running fine with 2 sticks. Went ahead and upgraded and purchased 2 more of the exact same stick. Upon boot up my PC will freeze in windows load screen, even freezes in bios after a few seconds. It runs just fine with any combination of 3 sticks in any combination of dimm slots. I upgraded bios and chipset and tried xmp profiles and adjusted dram voltage up to 1.35. any advice would be great! again all 4 sticks are exactly the same model and manufacturer. Corsair Vengeance RGB 2666 RAM model: CMR16GX4M2A26666C16

badbri Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 20 Feb 2018 Location: USA Status: Offline Points: 415	Post Options Post Reply Quote badbri Report Post Thanks(0) Quote Reply Posted: 22 Feb 2018 at 10:04am
	Check the XMP profile for the CAS set to 16-18-18-35 at 2666mhz and leave voltage at 1.20v, that is what their website lists it at. Also they list the SPD timing at 15-15-15-36 at 2133mhz 1.20v. Have never seen part of the CAS go down when speed goes up so am assuming that may be an error and it probably should be set to 16-18-18-36 at 2666mhz, if still no go try 16-19-18-36.