CAS versus MHZ, which one is more important

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Metalwell

Metalwell

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Dec 15, 2015
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Hello, I will be buying an 16 gb corsair ram, but it is cas 15 and 3000 mhz, on the other hand there is another corsair 16 gb which is cas 9 but 1600 mhz, which on is better or should i find something in between like 11 cas 2133 mhz
 
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Higher data rate is preferable but is more difficult to keep stable. DDR3-3000 is quite hard on memory controllers and only the best will be able to keep it busy
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Gingerbread

Gingerbread

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Nov 2, 2009
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Doesn't matter what you do, memory hardly breaks the 8.5nm barrier:
Example #1 - 1600.00(MHz) / 7(ClockLatency) = 228.57(MHz) / 2(DoubleDataRate) = 114.29(MHz) then 1(Second) / 114.29(MHz) = 8.75nS (nanoSeconds)

Example #2 - 1866.67(MHz) / 8(ClockLatency) = 233.33(MHz) / 2(DoubleDataRate) = 116.67(MHz) then 1(Second) / 116.67(MHz) = 8.57nS (nanoSeconds)

Example #3 - 2133.33(MHz) / 9(ClockLatency) = 237.04(MHz) / 2(DoubleDataRate) = 118.52(MHz) then 1(Second) / 118.52(MHz) = 8.44nS (nanoSeconds)

Example #4 - 2400.00(MHz) / 11(ClockLatency) = 218.18(MHz) / 2(DoubleDataRate) = 109.09(MHz) then 1(Second) / 109.09(MHz) = 9.17nS (nanoSeconds)

Example #5 - 2800.00(MHz) / 12(ClockLatency) = 233.33(MHz) / 2(DoubleDataRate) = 116.67(MHz) then 1(Second) / 116.67(MHz) = 8.57nS (nanoSeconds)

That's how the math goes, higher clock has lower latency and in the end it is brought to about equal.
 
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