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 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
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