I don't think you can mix it and unless you really are looking for that 0.05% speed increase it isn't worth the extra. Stick to CL2 and you will have matched pairs of memory that run at the same speed and don't cause uneven botle necks.
OnePlus 5 review
See the work of famous artists playing with toys
iPad Pro 10.5in (2017) review
Comment faire une capture d’écran sur un Mac ?