Memory latency and frequency

[X3r0]

Was wondering which would be better. Memory that has a higher frequency but has a higher latency vs memory that has lower frequency and lower latency?

[CoolaxGaming]

To find a better memory, divide the frequency by the latnecy. The higher the number you get, the better the memory is.

 

Example- 1600 MHZ with 10 latency vs. 2400 MHZ with 20 Latency (Yeah I know not realistic)

 

1600 / 10 = 160 and 2400 / 20 = 120.

 

The 1600 MHZ is better

[X3r0]

To find a better memory, divide the frequency by the latnecy. The higher the number you get, the better the memory is.

 

Example- 1600 MHZ with 10 latency vs. 2400 MHZ with 20 Latency (Yeah I know not realistic)

 

1600 / 10 = 160 and 2400 / 20 = 120.

 

The 1600 MHZ is better

thanks, i was trying to compare these two, i need to get some memory and also taking into consideration price:

http://www.newegg.ca/Product/Product.aspx?Item=N82E16820233698&cm_re=CORSAIR_Vengeance_LPX_16GB-_-20-233-698-_-Product

http://www.newegg.ca/Product/Product.aspx?Item=N82E16820233716&cm_re=CORSAIR_Vengeance_LPX-_-20-233-716-_-Product

 

[Priller]

thanks, i was trying to compare these two, i need to get some memory and also taking into consideration price:

http://www.newegg.ca/Product/Product.aspx?Item=N82E16820233698&cm_re=CORSAIR_Vengeance_LPX_16GB-_-20-233-698-_-Product

http://www.newegg.ca/Product/Product.aspx?Item=N82E16820233716&cm_re=CORSAIR_Vengeance_LPX-_-20-233-716-_-Product

 

 

The step to 2666 at CL 16 is higher then you want. Normally you would want to see it go to CL15. 

[X3r0]

The step to 2666 at CL 16 is higher then you want. Normally you would want to see it go to CL15. 

yea exactly thats why i was thinking of going with this latency is lower and cost is alot cheaper:

http://www.newegg.ca/Product/Product.aspx?Item=N82E16820233716&cm_re=CORSAIR_Vengeance_LPX-_-20-233-716-_-Product

but i could always go up to this:

http://www.newegg.ca/Product/Product.aspx?Item=N82E16820233694&cm_re=Corsair_Vengeance_LPX_16GB-_-20-233-694-_-Product

gonna cost more though

[Priller]

yea exactly thats why i was thinking of going with this latency is lower and cost is alot cheaper:

http://www.newegg.ca/Product/Product.aspx?Item=N82E16820233716&cm_re=CORSAIR_Vengeance_LPX-_-20-233-716-_-Product

but i could always go up to this:

http://www.newegg.ca/Product/Product.aspx?Item=N82E16820233694&cm_re=Corsair_Vengeance_LPX_16GB-_-20-233-694-_-Product

gonna cost more though

 

Alot of ram will "generally" overclock much higher as you loosen the timings. Through binning is where they find which ram will run both higher speeds and lower latency. Either way your better off spending alittle more. That way you can either get higher speeds or go to lower speeds but tighten the timings. Should you be more adventurous you could even loosen the timings and go for even higher speeds then 2666 etc which would put it on par with a kit that is much more expensive. You may need to increase ram voltage and play with the memory controller to get there tho.

 

EDIT: A very quick search comes up with 2666 at CL15 that is much cheaper then the Corsair stuff you were looking at.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231797

 

It even has tighter tertiary timings which some say is the key to better memory performance with DDR4 but that is unconfirmed.

[X3r0]

Alot of ram will "generally" overclock much higher as you loosen the timings. Through binning is where they find which ram will run both higher speeds and lower latency. Either way your better off spending alittle more. That way you can either get higher speeds or go to lower speeds but tighten the timings. Should you be more adventurous you could even loosen the timings and go for even higher speeds then 2666 etc which would put it on par with a kit that is much more expensive. You may need to increase ram voltage and play with the memory controller to get there tho.

 

EDIT: A very quick search comes up with 2666 at CL15 that is much cheaper then the Corsair stuff you were looking at.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231797

 

It even has tighter tertiary timings which some say is the key to better memory performance with DDR4 but that is unconfirmed.

ok thanks, so your suggesting to go with the 2666 at cl 15?

[Priller]

ok thanks, so your suggesting to go with the 2666 at cl 15?

 

Well that depends on what your looking to spend on memory.

 

The G. Skill kit or something comparable for 229 isnt that bad. But let's say your ok with spending the 344 for that one 2666 CL15 kit from Corsair. 

 

If that was the case then why not go with 3000 CL15 for 328?

http://www.newegg.com/Product/Product.aspx?Item=N82E16820233740

 

Or something similar? 

[Priller]

Here is G. Skill 3000 CL 15 for 279.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231822

 

One last thing to keep in mind.

If you notice the voltage it is at 1.35V so you most likely wont get higher then 3000. If you look at a 2800 kit at 1.2V then you might get higher then 3000 at 1.35V.

[X3r0]

Well that depends on what your looking to spend on memory.

 

The G. Skill kit or something comparable for 229 isnt that bad. But let's say your ok with spending the 344 for that one 2666 CL15 kit from Corsair. 

 

If that was the case then why not go with 3000 CL15 for 328?

http://www.newegg.com/Product/Product.aspx?Item=N82E16820233740

 

Or something similar? 

See this would be fantastic and i would go 3000 at CL15 but i live in Canada so the G. Skill Kit and the Corsair kit at 3000 mhz are alot more expensive. Just to give you an idea the corsair kit 2800 at cl 16 is 400 bucks(on sale reg 440) :

http://www.newegg.ca/Product/Product.aspx?Item=N82E16820233696&cm_re=Corsair_Vengeance_LPX_16GB-_-20-233-696-_-Product

i couldnt even find the 3000 kit on their site it would probably be alot more

[Priller]

See this would be fantastic and i would go 3000 at CL15 but i live in Canada so the G. Skill Kit and the Corsair kit at 3000 mhz are alot more expensive. Just to give you an idea the corsair kit 2800 at cl 16 is 400 bucks(on sale reg 440) :

http://www.newegg.ca/Product/Product.aspx?Item=N82E16820233696&cm_re=Corsair_Vengeance_LPX_16GB-_-20-233-696-_-Product

i couldnt even find the 3000 kit on their site it would probably be alot more

 

I just looked up some pricing. It would cost me 35.95 dollars(US) to ship ram to Alberta Canada. That would save you quite a bit of money on ram.

 

Also, doesn't Newegg ship to Canada?

[X3r0]

I just looked up some pricing. It would cost me 35.95 dollars(US) to ship ram to Alberta Canada. That would save you quite a bit of money on ram.

 

Also, doesn't Newegg ship to Canada?

just checked their site, newegg.com will not ship to canada, if i want to purchase a product from newegg i would have to go through newegg.ca

[X3r0]

I just looked up some pricing. It would cost me 35.95 dollars(US) to ship ram to Alberta Canada. That would save you quite a bit of money on ram.

 

Also, doesn't Newegg ship to Canada?

with that being said it would cost me alot more money to go with the ones u suggest, if they could ship to canada i would definetly go through newegg.com as its obviously a wayyy better deal

[Legitsu]

memory speed doesn't really matter pretty much any 1600Mhz kit is enough

[Priller]

with that being said it would cost me alot more money to go with the ones u suggest, if they could ship to canada i would definetly go through newegg.com as its obviously a wayyy better deal

 

Its about 70~ difference from the US site to Canadian site.

 

Here are the best two options I could find.

http://www.newegg.ca/Product/Productcompare.aspx?Submit=ENE&N=100007610%20600521523&IsNodeId=1&page=3&bop=And&CompareItemList=147%7C20-231-800%5E20-231-800-TS%2C20-231-822%5E20-231-822-TS&percm=20-231-800%3A%24%24%24%24%24%24%24%3B20-231-822%3A%24%24%24%24%24%24%24

 

Hopefully that link works.

 

There is a Corsair kit at the same price at 399 but the timings match the cheaper G. Skill kit. 

[Priller]

memory speed doesn't really matter pretty much any 1600Mhz kit is enough

 

They make 1600 DDR4?

[X3r0]

They make 1600 DDR4?

im pretty sure they dont

[Priller]

im pretty sure they dont

 

That was sort of my point since I'm sure he thought we were talking about DDR3. JEDEC for DDR4 starts at 2133.

[X3r0]

That was sort of my point since I'm sure he thought we were talking about DDR3. JEDEC for DDR4 starts at 2133.

yea i think so to. thanks for your help though

[patrickjp93]

To find a better memory, divide the frequency by the latnecy. The higher the number you get, the better the memory is.

 

Example- 1600 MHZ with 10 latency vs. 2400 MHZ with 20 Latency (Yeah I know not realistic)

 

1600 / 10 = 160 and 2400 / 20 = 120.

 

The 1600 MHZ is better

No, NO, NO! It's latency over clock rate. cycles/cycles-per-second = seconds (absolute latency).

 

You want high clock rate, low latency. also, its technically CL/(rate/2) due to DDR being double data rate and double pumping each clock.

 

A low absolute number is best.

[Legitsu]

No, NO, NO! It's latency over clock rate. cycles/cycles-per-second = seconds (absolute latency).

 

You want high clock rate, low latency. also, its technically CL/(rate/2) due to DDR being double data rate and double pumping each clock.

 

 

clock for clock DDR4 is not any faster then DDR3 ...  in fact ddr3 usually has the edge because of the lower latency kits available

latency scales with clock speed tho so a DDR4 3000 Kit @ cl15 is going to have about the same latency as a DDR3 kit @ 1866 CL 11

and at the end of the day for the majority of workloads ram speed has nearly no impact on performance .. 

[patrickjp93]

clock for clock DDR4 is not any faster then DDR3 ...  in fact ddr3 usually has the edge because of the lower latency kits available

latency scales with clock speed tho so a DDR4 3000 Kit @ cl15 is going to have about the same latency as a DDR3 kit @ 1866 CL 11

and at the end of the day for the majority of workloads ram speed has nearly no impact on performance .. 

No, it isn't. DDR3 has a 32 bit wide bus. DDR4 is 64 bits wide. For anything truly memory intense, DDR4 will be faster as latencies fall back to DDR3 levels.

[Legitsu]

No, it isn't. DDR3 has a 32 bit wide bus. DDR4 is 64 bits wide. For anything truly memory intense, DDR4 will be faster as latencies fall back to DDR3 levels.

latency's are not there yet tho so that point is moot 

and I don't think you understand what they mean by buss width because ddr3 is also 64 bits per clock wide 

[patrickjp93]

latency's are not there yet tho so that point is moot 

and I don't think you understand what they mean by buss width because ddr3 is also 64 bits per clock wide 

They will be. DDR3 had much higher latency than DDR2 at the same clock rates for 3 years until they bottomed out.

 

No, DDR3 is 32 doubled pumped up and down. DDR4 is a true 64-wide bus double pumped for 128.

[Legitsu]

They will be. DDR3 had much higher latency than DDR2 at the same clock rates for 3 years until they bottomed out.

 

No, DDR3 is 32 doubled pumped up and down. DDR4 is a true 64-wide bus double pumped for 128.

not on  current platforms its not ...  its still 64bit 

 

http://en.wikipedia.org/wiki/DDR4_SDRAM

if you are talking about the inner-bank bandwidth e.g the bandwidth between the chips on a dim then yes 128bit is possible due to going from 8 to 16 banks thats not the same as the buss width between the cpu and the DIMMS