[QUOTE=fivemack;529760]Four 16GB Corsair Vengeance LPX, advertised as 2666MHz but dmidecode says they're running at 2133MHz.

[url]https://www.scan.co.uk/products/64gb-(4x16gb)-corsair-ddr4-vengeance-lpx-black-pc4-21300-(2666)-non-ecc-unbuffered-cas-16-18-18-35-x[/url][/QUOTE]

Turn on XMP. Hardly any non-server memory is above "stock" 2133. Anything above it usually implies XMP.

Btw, my 7940X (ES) will do 3466 with a full load of 8 x 16GB.

[QUOTE=fivemack;529760]Four 16GB Corsair Vengeance LPX, advertised as 2666MHz but dmidecode says they're running at 2133MHz.
[/QUOTE]

dmidecode may be reading the "standard" 2133 timing set from the DDR4 SPD, instead of the XMP 2.0 2666 timing set. I suspect your memory is already running at 2666 so this may be just a reporting error, assuming XMP 2.0 profile has been enabled in BIOS.

@scan80269
Quad channel DDR3 is certainly sized for AVX1 processors, I think my Xeon Ivy Bridge is limited by the absence of AVX2 and FMA3 instructions AND quad channel DDR4, George did a great job on these instructions.

@fivemack
Is the noise acceptable when you run LL ?
which cooling system do you have ?