Better Memory (Latency vs Speed)

[Shadowman]

Currently looking at 2x 32 GB DDR4 memory kits from G Skill, but from the below which would be better performance wise  as one has low latency (timings)  and lower speed vs high latency and high speed?

 

Speed:     3200 MHz 

Timings: 14-14-14-34

 

VS

 

Speed:     3733 MHz

Timings: 17-17-17-37

[Cherrypie]

I don't think you'll be able to notice the difference, but I would go for the 3200 mhz.

[Jurrunio]

What system are you putting it in? AM4 mobo support up to 3200Mhz while Intel Z chipset boards are more complicated. Some go up to 4266 while some have 3200.

[Tzachi]

15 minutes ago, Cherrypie said:

I don't think you'll be able to notice the difference, but I would go for the 3200 mhz.

 

3 minutes ago, Jurrunio said:

What system are you putting it in? AM4 mobo support up to 3200Mhz while Intel Z chipset boards are more complicated. Some go up to 4266 while some have 3200.

Building on what the 2 fine people have sad i would have chosen the 3200Mhz RAM, since you are not likely to see any difference in performance I think the 3200 Mhz seem to have a better chance of being compatible.

[Jurrunio]

2 minutes ago, Tzachi said:

 

Building on what the 2 fine people have sad i would have chosen the 3200Mhz RAM, since you are not likely to see any difference in performance I think the 3200 Mhz seem to have a better chance of being compatible.

Compatibility is not a problem in this case though. Fast RAM can run at lower speeds without problems.

[Shadowman]

Sorry should have mentioned will be going in a x299 motherboard with a i9 7900x cpu

[Tzachi]

Generally speaking clock speed is more important, so i would suggest the 3733 in this case. but again there is very little chance you'll see any difference.

[DXMember]

You can't directly compare timings between different clock speeds.

The timings are how many CLOCK cycles does it take to complete an operation in memory.

 

At 1600 MHz clock speed (half of 3200 due to marketed duoble data rate) one clock of memory takes 0.625ns

And since timings define how many clocks it takes, with 14-14-14-34 timings you'll have:

CAS# Latency, RAS# to CAS# Delay, RAS# Precharge of 8.75ns

and Cycle time of 21.3ns

 

At 1866 MHz clock speed one clock of memory takes 0.536ns

But due to increase in timings you end up with:

CAS# Latency, RAS# to CAS# Delay, RAS# Precharge of 9.11ns

and Cycle time of 19.8ns

 

As you see latencies are within 5% between the two modules.

The faster clock does offer about 15% more bandwidth troughput though.

It is however likely that you'll be able to overvolt the memory and decrease the timings or increase the clock speed furhter improving the performance..

 

Anyhow, what is your inteded use case for the memory and what is the price diffirence?

[Shadowman]

1 hour ago, DXMember said:

You can't directly compare timings between different clock speeds.

The timings are how many CLOCK cycles does it take to complete an operation in memory.

 

At 1600 MHz clock speed (half of 3200 due to marketed duoble data rate) one clock of memory takes 0.625ns

And since timings define how many clocks it takes, with 14-14-14-34 timings you'll have:

CAS# Latency, RAS# to CAS# Delay, RAS# Precharge of 8.75ns

and Cycle time of 21.3ns

 

At 1866 MHz clock speed one clock of memory takes 0.536ns

But due to increase in timings you end up with:

CAS# Latency, RAS# to CAS# Delay, RAS# Precharge of 9.11ns

and Cycle time of 19.8ns

 

As you see latencies are within 5% between the two modules.

The faster clock does offer about 15% more bandwidth troughput though.

It is however likely that you'll be able to overvolt the memory and decrease the timings or increase the clock speed furhter improving the performance..

 

Anyhow, what is your inteded use case for the memory and what is the price diffirence?

 Will be used a lot for video editing, some gaming. Price is not a issue was just looking at these 2 kits which would be better and just go for that regardless of the price difference.

[DXMember]

3 hours ago, Shadowman said:

 Will be used a lot for video editing, some gaming. Price is not a issue was just looking at these 2 kits which would be better and just go for that regardless of the price difference.

in that case just get the 3733 kit and try to tighten the timings manually