ASUS MAXIMUS VIII RANGER won't go over 3500MHz on RAM on certain DIMM slots

I got myself new 2×8GB 3733MHz sticks and my ASUS MAXIMUS VIII RANGER just cannot get them to work properly. I always got a debug code 55 or sometimes 49 looping with 01 or 03 codes.

First thing I tried of course was the XMP profile - didn't work.
So I tried:
- Different memory multipliers. The highest I could go was RAM going on preset 3466MHz.
- Push the voltage and timings up and go there with BCLK overclocking. Whatever I did, change of different voltages, clocks, I was always stuck at about 3500MHz.
- Older BIOSes, the older one that is claiming "Improved DRAM XMP compatibility over 4200MHz on RAM." and others.
- Have just one stick installed in different slots.
- "EZ" technologies or "MemOK", it does set something resulting in same debug post codes

The ONLY config I could get 3733MHz to work was in slot second closest to the CPU (DIMM #2) with just one stick single channel installed (both sticks were able to load the XMP profile there), slot 1/3/4 was getting that above debug codes.

Is my board defective, should I return it?
Reply to krYshuT
2 answers Last reply
More about asus maximus viii ranger 3500mhz ram dimm slots
  1. Only up to 3400 is officially supported.

    4 x DIMM, Max. 64GB, DDR4 3400(O.C.)/3333(O.C.)/3300(O.C.)/3200(O.C.)/3000(O.C.)/2800(O.C.)/2666(O.C.)/2400(O.C.)/2133 MHz Non-ECC, Un-buffered Memory
    Reply to SR-71 Blackbird
  2. SR-71 Blackbird said:
    Only up to 3400 is officially supported.

    4 x DIMM, Max. 64GB, DDR4 3400(O.C.)/3333(O.C.)/3300(O.C.)/3200(O.C.)/3000(O.C.)/2800(O.C.)/2666(O.C.)/2400(O.C.)/2133 MHz Non-ECC, Un-buffered Memory


    As I said, it supports 4200MHz on new Maximus BIOSes.
    I can run XMP 3733MHz on DIMM #2, please read my post again
    Reply to krYshuT
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