Memory unstable or bad config?

[Cyplex]

I'm having a bit of problem, I just built the following system:

 

 

 

with this memory

 

 

 

 

 

My problem:

 

The system won't post to Windows with the correct memory amount nor speed (see below):

 

 

Plus I cannot make it post to 4000mhz, seems capped at about 2700mhz.

 

Anything above that the system will just not post or hang in boot.

 

What I have tried:

 

1)    Moving the dimms (A1, B1, C1, D1) around without any success.

 

2)    Using either single 16Gb dimm -> Windows sees it as 15.7Gb each.

 

3)    Updated MB BIOS to the latest version which ups the XMP/Memory compatibility.

 

4)    Manually forcing the BIOS to the memory rated settings/timings makes the system not post

 

5)    Using ASUS XMP the bios accepts the 4000Mhz OC speed but sets the base speed at 2700 mhz

 

6)     BIOS posts 32GB of memory

 

7)     If I'm not mistaken this CPU does not have a builtin video control unit that would account for using up some the memory bank

 

More information:

 

Any feedback would be appreciated!

[Mando]

15 hours ago, Cyplex said:

I'm having a bit of problem, I just built the following system:

 

 

 

with this memory

 

 

 

 

 

My problem:

 

The system won't post to Windows with the correct memory amount nor speed (see below):

 

 

Plus I cannot make it post to 4000mhz, seems capped at about 2700mhz.

 

Anything above that the system will just not post or hang in boot.

 

What I have tried:

 

1)    Moving the dimms (A1, B1, C1, D1) around without any success.

 

2)    Using either single 16Gb dimm -> Windows sees it as 15.7Gb each.

 

3)    Updated MB BIOS to the latest version which ups the XMP/Memory compatibility.

 

4)    Manually forcing the BIOS to the memory rated settings/timings makes the system not post

 

5)    Using ASUS XMP the bios accepts the 4000Mhz OC speed but sets the base speed at 2700 mhz

 

6)     BIOS posts 32GB of memory

 

7)     If I'm not mistaken this CPU does not have a builtin video control unit that would account for using up some the memory bank

 

More information:

 

Any feedback would be appreciated!

On Asus high end boards, you need to not only set XMP mode, but change the speed rating lower down in that section to show the exact 4000Mhz, otherwise it will ramp up and down. I would also suggest setting "Odd FSB ratio" to Disabled. 

Use slots A1 and B1 

 

also the less usable than the DIMMS have, nothing to worry about. Windows reserves some phys ram as R only.