What to look for when buying DDR 4 ram, speed or low CL ?

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Higher data rate > lower latency. I haven't had a chance to play with DDR4 yet myself, but I've heard good things about DDR4-2666 and above. Keep in mind that Intel only natively supports up to DDR4-2133 at this time. Higher data rates are possible, but not supported by Intel.
Higher data rate > lower latency. I haven't had a chance to play with DDR4 yet myself, but I've heard good things about DDR4-2666 and above. Keep in mind that Intel only natively supports up to DDR4-2133 at this time. Higher data rates are possible, but not supported by Intel.
 
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