Originally posted by g r y m e s:
Good to know. So I should say away from CL4.


Yes. The CAS latency number refers to the number of clock cycles that elapse between the time that the memory controller requests to read a memory location and the time that that data is returned - so obviously, lower numbers are better. There is actually a series of 4 numbers for measuring RAM latency, of which CL (CAS latency) is the first. I don't remember what all 4 numbers mean, but a decent timing to look for is something like 2-3-3-6. Of course, it may be to your advantage to calculate the actual latency times (in nanoseconds) to be able to compare the latencies of RAM chips of varying speeds (for example, DDR2 chips have much higher latency ratings but due to their faster clock speed, are faster when compared in terms of nanoseconds). I don't know much about the G5, but if the clock speed of the memory you're looking at is 800MHz or higher then a CAS latency of 4 is actually pretty good.

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