Mhz vs CAS

Guest2

Guest2

Guest2

Soldato
Joined
6 May 2009
Posts
20,408
I pulled this from a review post

CAS latency is given in cycles. So, this DDR3 1333 CAS7 RAM will take 7 cycles at 1333Mhz to respond. That would be 7/1333 seconds, which is 0,0052 seconds to respond. While the DDR3 1600 CAS 9 will take 9/1600, which is equal to 0,0056 seconds, to respond. Thus, this 1333Mhz one is faster.
Click to expand...

Is this correct? If so then wouldn't it be a lot easier to work out speeds if the manufacturer / seller wrote 'Response .0056' instead?

I am guessing its to blind people with numbers 8000Mhz!! ...but CAS50 so would work out at .0062 - slower than 1333Mhz CAS7

In short, what is the quickest memory? (The lowest CAS latency ram and highest Mhz)
 
In short you want high freq with low cas latency and tuned timings, i have a set of G.Skill PI's that will do 2666+mhz with cas8-12-8-28-88-1t and tight subs, under Ln2 these will do the same speed and more at cas6!
A lot is cpu dependant imc and architecture (sandybridge, ivy, haswell, etc) they all have there own comfort zone with regards speed/mhz
Most people would notice very little in ram kits/speed/latency if there gaming etc but for encoding, benchmarking there can be large gains to be had.
 
I have a socket 1156 motherboard that takes up to 1.5v memory. My currently memory is rated 1.5v - 1.65v but is only stable at 1.5v with relaxed timings (11-11-11-27 instead of 9-9-9-24) I have it at this because my CPU (i5 760) is overclocked.

Default Mhz on memory frequency is 1333, but it is at 1600Mhz now

Do you think I need to stick to 1.5v (or less) memory to be sure I can overclock it as I can my current stuff?

I may just buy a 2nd hand bundle and sell the lot instead of paying ~£80 for 16gb of memory
 
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