Which ram is faster?

[lhaditr]

Hello. Which RAM is faster between:
1) 3600MHZ CL15
2) 3200MHZ CL14
3) 2666MHZ CL13

I know it isn't a noticeable difference, but I have money for any of them. So tell me which is faster, please. Thank you a lot!

 

[luckymatt42]

I posted this in another thread, but perfect for this one also:

Here's a very brief explanation of how timings and frequency work, so you have the info to figure it out for yourself.

The "1333" is the speed in MHz...otherwise known as cycles per second. so it takes 1/1333rd of a second to complete one cycle.

The timings (9-9-9-24) tell you how many cycles it takes to complete each kind of operation.

So to find the "Theoretical" speed of the memory would be 1/(speed in Mhz) multiplied by (CAS Latency timing)...lower is faster. (Again that's a theoretical max limit, some applications respond better to higher frequencies, some to tighter timings).

 

[lhaditr]

Oh. Thank you a lot for answering, now I understand. But, can you recommend what should one I take? I have money for them all 3 so this isn't a problem, just want your opinion. Again, thanks a lot!

 

[Barty1884]

Depends on the tasks, really.

As far as effective speed / latency, I would expect them to perform pretty similarly overall - unless a specific workload/CPU will benefit heavily from *faster* memory.

Each of those have their pro's & cons. What are you looking to pair it with? And for what tasks?

There's a calculation, which kind of gives you a rough view of "better".... I believe it's for "true" latency.... which kind of works each kit back to a small value, lower is "better"
CL x 2000 / speed

So
15x2000 / 3600 = 8.3
14x2000 / 3200 = 8.75
13x2000 / 2666 = 9.75


BUT, that's extremely simplistic. For example, the slightly looser timings for the 3600MHz kit would be 100% worth it, if being paired with a Ryzen CPU.

 

[Deleted member 217926]

3600/15. You sure it isn't 3600/16? Even then that's the fastest.

Modern processors make more use of the increased bandwidth offered by speed than they do low cas latency.

 

[Barty1884]

There's 3 kits with CL15 anort.... Only one that's a 2x8GB kit though.
https://pcpartpicker.com/products/compare/z4nG3C,vTJkcf,yCVBD3/

https://www.gskill.com/en/press/view/g-skill-announces-ddr4-3600mhz-cl15-15-15-16gb-8gbx2--low-latency-memory-kit

Disproportionately priced for the "benefit" in 99.99% of tasks, but they do exist.

 

[lhaditr]

Thank you a lot. Really fast answers, love it. I would want to buy a PC with those:
CPU: I7 8700 not K
GPU: Inno3D GeForce GTX 1080 iChill X3 8GB DDR5X 256-bit
MotherBoard: ASRock Z370 Taichi
Memory: https://pcpartpicker.com/product/yCVBD3/gskill-tridentz-series-16gb-2-x-8gb-ddr4-3600-memory-f4-3600c15d-16gtz
The PC I will use on Gaming and Making videos(most on games)
My question is... Can I put that memory RAM to that motherboard? If not, with what should I change?

 

[Barty1884]

For those types of task(s), I doubt you'd benefit much/at all from the greater speeds.

A 2x8GB "kit" of 3000MHz is probably your best "value" IMO.

I mean, that G.Skill kit is more than a $100 premium.... in an already pricey RAM market.
A complete waste, IMO.

https://pcpartpicker.com/product/Cf98TW/gskill-memory-f43200c16d16gvkb
https://pcpartpicker.com/product/jx8H99/team-vulcan-16gb-2-x-8gb-ddr4-3000-memory-tlred416g3000hc16cdc01
https://pcpartpicker.com/product/Cw2rxr/team-dark-16gb-2-x-8gb-ddr4-3000-memory-tdred416g3000hc16cdc01

$150-$160 kits, 3000-3200MHz CL16.


The board will support a 2x8GB kit, yes.

 

[lhaditr]

OK. I hope I will not have problems with that RAM and that motherboard(such as not seeing 3000MHZ - correct me if I am wrong, I am new to this and I want everything to be perfect).

 

[Barty1884]

I'm not sure what you're asking?

You'd simply enable "XMP" in the BIOS, and the profile will load running 3000MHz.


FWIW, the Z370 Taichi is probably a waste unless you pair it with a "K" CPU.
There are other features (SLI etc), but nothing worth paying the extra money for, for most people.

To run with an i7-8700 and 2x8GB + 1x GPU.... even a budget B360 board is sufficient:
https://pcpartpicker.com/product/PzF48d/msi-b360m-pro-vd-micro-atx-lga1151-motherboard-b360m-pro-vd