Which CPU and chipset do you have?
Bandwidth is slightly more important than latency. (CpU's have caches after all)
So faster MHZ is the more important consideration than timing.
So consideration should be mhz, cl, voltage, other timings.
Main machine: Core I7 -2600K @ 4.0Ghz / 16 gig ram / Radeon RX 580 8gb / 500gb toshiba ssd / 5tb hd
Old machine: Core 2 quad Q6600 @ 3ghz / 8 gig ram / Radeon 7870 / 240 gb PNY ssd / 1tb HD