Quote Originally Posted by The Stilt View Post
Ordered mine from Flexxmemory.
They arrived in two days, which is pretty damn quick.

M378B5173QH0-CK0 (4GB Single Rank)

M378B1G73QH0-CK0 (8GB Dual Rank)

Tried older bios versions on the Z87M-PLUS, they made no difference.
I also tried adding a XMP profile taken from a compatible 2666MHz CL12 MFR dual rank kit.
It appears the bios is not even able to interprete the XMP profiles properly. It doesn't set the secondary timings at all eventhou they are specified in the XMP profile. Tried to set the main and secondary timings manually based on a MFR timing set, it made no difference either.

On a 5800K Trinity APU I was able to make them run at 1308MHz 12-13-13 with 1.52V.
Didn't try any tighter timings or higher voltages as the IMC isn't very stable even at that frequency.

I'm not going to waste any more time on Haswell or AMD.
Afterall I am gone anyway pretty soon.
Set TRDWR + TRDWR_dr+dd set from tertiary manually to relaxed values like 15-16 whatever,then u will be able to boot,then u tighthen them up.It's a ty issue and it was reported llong time ago by me....