DDR4 Cl Ratings

[keithc]

I'm just curious if the CL rating really makes a difference on a piece of RAM. So would a DDR4 3000 MHz with a CL15 be faster or slower then a piece of DDR4 at 2400 MHZ with a CL10. Since i'm studying for my A+ exam i found this to be a very interesting subject, Could someone give me an equation to figure out the difference or simply explain it to me.

 

[oczdude8]

Have you tried googling it? there are many posts just on Toms about this.
ex: http://www.tomshardware.com/answers/id-1922024/ram-latency-clock-speed.html

 

[TJ Hooker]

DDR4-3000 latency would be 10 ns, DDR4-2400 latency would be 8.33 ns. So DDR4-3000 would have higher bandwidth but higher (worse) latency. Which one would be "faster" would likely depend on the application.

Edit: For most applications there probably won't be a noticeably difference in performance between the two.

 

[keithc]

Have you tried googling it? there are many posts just on Toms about this.
ex: http://www.tomshardware.com/answers/id-1922024/ram-latency-clock-speed.html

I did try googling it didn't find what i was looking for that is why I'm asking.

 

[geofelt]

A simple equation:
ram speed/cas = indicator of merit for performance. Higher is better.

Here is a good article on the subject for skylake:
http://www.silentpcreview.com/article1478-page1.html

For haswell:
http://www.anandtech.com/show/7364/memory-scaling-on-haswell

 

[Tradesman1]

Might also look at my article, item 4

http://www.tomshardware.co.uk/ddr3-dram-faq,review-33220.html