chose between ram sticks

[TheRonen]

Hello

i want to upgrade my pc and i am looking for a new RAM, 16x2 (for 3d render), and i want to know which is better

HyperX HX424C15FB3AK2/32

HyperX HX424C12PB3K2/32

HyperX HX424C15FBK2/32

 

higher cl is better or lower ? 

 

Thanks ! 

[Eigenvektor]

CL is latency, so lower is better, but probably not that noticeable/important for rendering.

[Bombastinator]

High MHz better than low MHz, low cas better than high cas.  Cas will go up as MHz increases though so cas is only easily comparable amongst sticks of the same MHz.  The other thing about cas is there are 4 numbers not one.

 

16-24-24-42 is slower than 16-16-16-36

[TheRonen]

10 minutes ago, Bombastinator said:

High MHz better than low MHz, low cas better than high cas.  Cas will go up as MHz increases though so cas is only easily comparable amongst sticks of the same MHz.  The other thing about cas is there are 4 numbers not one.

 

16-24-24-42 is slower than 16-16-16-36

Now i am more confused, which model do you recommend ? 
 

HyperX HX424C15FB3AK2/32

HyperX HX424C12PB3K2/32

HyperX HX424C15FBK2/32

[Eigenvektor]

1 minute ago, TheRonen said:

Now i am more confused, which model do you recommend ? 
 

HyperX HX424C15FB3AK2/32

HyperX HX424C12PB3K2/32

HyperX HX424C15FBK2/32

They all run at the same speed (2400 MHz), so the transfer speed is the same. The only difference is the CAS latency, so the model with the lowest number will have the lowest latency. I can't tell you for certain, but the effect on 3D rendering should be negligible, so unless the prices are very similar, I'd go with the cheapest one.

 

In terms of performance, it would probably be better to go with something faster (e.g. 3000, 3200 or even 3600 MHz) even if that means you have a higher CAS latency.

 

What @Bombastinator is referring to is the fact that CAS latency is given in clock cycles. A memory stick running at 2400 MHz with a latency of 12 cycles and a stick running at 3600 MHz and CL 18 has the exact same absolute latency (10 nanoseconds).

[TheRonen]

38 minutes ago, Eigenvektor said:

They all run at the same speed (2400 MHz), so the transfer speed is the same. The only difference is the CAS latency, so the model with the lowest number will have the lowest latency. I can't tell you for certain, but the effect on 3D rendering should be negligible, so unless the prices are very similar, I'd go with the cheapest one.

 

In terms of performance, it would probably be better to go with something faster (e.g. 3000, 3200 or even 3600 MHz) even if that means you have a higher CAS latency.

 

What @Bombastinator is referring to is the fact that CAS latency is given in clock cycles. A memory stick running at 2400 MHz with a latency of 12 cycles and a stick running at 3600 MHz and CL 18 has the exact same absolute latency (10 nanoseconds).

Thanks ! 
My cpu only supports 2400 MHz (i5 7500)

 

thanks anyway !