Jun 22, 2009, 01:34 AM // 01:34
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#21
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Core Guru
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Quote:
Originally Posted by Rahja the Thief
Acceptable CAS Latencies are as follows:
<font color="blue"> - DDR1= 2.5ns, 2ns
- DDR2= 3 to 7ns, varies on speed. (most models you want between 4-6ns)
- DDR3= 6 to 9ns, again varies on speed.
</font>
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Memory timings are in Clock Cycles, not Nanoseconds. A CAS Latency of "9" on DDR3 means 9 cycles, not 9 nanoseconds.
DDR3-1600 CL9 = 1.25ns per clock = 11.25 delay
But if you can overclock that memory to 1800...
DDR3-1800 CL9 = 1.1ns per clock = 10ns delay
And lets look at performance:
DDR2-1200 CL5 = 1.66ns per clock = 8.3ns delay
DDR3-1866 CL7 = 1.07ns per clock = 7.5ns delay
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