choosing DDR4 memory , speed vs CAS

[jddem]

MOBO- MSI x99A SLI PLUS + Intel 5820k

ultimately i would like to run 64GB ram
after looking over the OC options and regular memory options at
http://us.msi.com/support/mb/X99a-SLI-PLUS.html#support-mem

I see at best I could go 2400 at 64GB so I am opting for 2133 (I read real world difference is meh)

I found these 2 (which both allow for some overclocking)
which is better (I think Corsair, but most of what I read praises the GSKILL)
http://www.newegg.com/Product/Product.aspx?Item=N82E16820233731

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231788

Thanks

PS

This was the only OC memory I could find that would support an eventual upgrade to 64GB

http://www.newegg.com/Product/Product.aspx?Item=N82E16820211913

 

[gwiddle]

The Corsair is better because it has a lower CAS latency and timings. This means the response time is quicker (the numbers are cycles). You can calculate the general response time in seconds by dividing the CAS latency by the frequency (remember Mhz is million cycles)

Corsair: 13 / (2133 * 1,000,000) = 6.09 x 10^-9 seconds = .00000000609 secs
GSkill: 15 / (2133 * 1,000,000) = 7.03 x 10^-9 seconds = .00000000703 secs

In terms of some cheaper DDR3 memory, GSkill is highly praised for its price/performance, but Corsair makes some of the best RAM.

 

[jddem]

I thought so too, but the price is what threw me.
Is it a waste to buy 2133 for that setup? should i get 2400? or is it accurate that the boost would neg.

 

[Tradesman1]

Do you want 32GB (your links) or 64GB (what you said)? If thinking 64GB you should be looking at a single set of 64 GB, there are no guarantees when mixing two sets of DRAM - you probably noted that 64GB are more expensive and there's good reason - it takes a lot more testing to find 8 sticks that will all place nice than it does 4. Have seen many buy 2 sets of 2 sticks instead of a 4 stick set, or 2 sets of 4 sticks instead of an 8 sticks set, thinking they are getting one over on the manufacturer and only to find the two sets won't play, then they get to pay return postage, restocking fees (often about 15% (if the place even gives refunds) and no DRAM for a week or two or more

 

[jddem]

I figured I could go with 2 sets of 32 (buy on e now and one later) and if u look at the MSI compatibility chart is has the 32GB set listed as compatible in all 8 slots. Unless I am missing something

 

[Tradesman1]

If you want to try, it's your call, just letting you know what can and often does happen