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Which is better, DDR4 at 3000MHz CL15 or 3200MHz CL16

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Posted · Original PosterOP

I finally got my DDR4 quad-channel kit running correctly, but after some more tinkering I managed to bring it down from it's default 3000MHz CL16 rating to a CL15. I also found ot that if I keep the CL16 I can do 3200MHz no problem. In both cases I keep the voltage at stock - 1.35V. 

 

So, as the title says, which would be better:

 

- 3000MHz with CL15 (15-15-15-35 -1T) 

 or

- 3200MHz with CL16 (16-16-16-36 -1T)

 

I tried to find some info on this, but couldn't get a definitive answer on whether there is actually any difference in terms of performance. 

 


CPU: Intel Core i7 5960X @4.5GHz cooled by Corsair H110 | MBO: ASRock Fatal1ty X99M Killer | RAM: GEIL Evo Potenza 16GB DDR4 3333MHz | GPU: Zotac GTX1080 Founders Edition | SSD: 512GB Transcend 370S | HDD: 1.5TB WD Green Drive | PSU: Corsair SF 600W | Case: Jansbo UMX3 S

Check out the build log here -> http://linustechtips.com/main/topic/257949-analogs-project-rrh-red-riding-hood/           Another build log featuring Power Mac G5 case that I never got around to uploading the latest pictures of -> http://linustechtips.com/main/topic/454140-analogs-project-silverine-ft-apple-powermac-g5-case-modding/      Latest Build Log -> UPCOMING

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yeah pretty much no difference, imo. get more MEGAhz just cuz MEGAhz.


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I finally got my DDR4 quad-channel kit running correctly, but after some more tinkering I managed to bring it down from it's default 3000MHz CL16 rating to a CL15. I also found ot that if I keep the CL16 I can do 3200MHz no problem. In both cases I keep the voltage at stock - 1.35V. 

 

So, as the title says, which would be better:

 

- 3000MHz with CL15 (15-15-15-35 -1T) 

 or

- 3200MHz with CL16 (16-16-16-36 -1T)

 

I tried to find some info on this, but couldn't get a definitive answer on whether there is actually any difference in terms of performance. 

 

in the real world your not gonna notice any difference. if you use winrar  lots go with the faster 3200mhz speed (who knows maybe your the dude that rar's up my newsgroup DL's)

 

if they both require the same voltage then take your pick

 

run some aida64 cache\ memory benchies to see how they perform at different speeds\timings or maxxmem


Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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I finally got my DDR4 quad-channel kit running correctly, but after some more tinkering I managed to bring it down from it's default 3000MHz CL16 rating to a CL15. I also found ot that if I keep the CL16 I can do 3200MHz no problem. In both cases I keep the voltage at stock - 1.35V. 

 

So, as the title says, which would be better:

 

- 3000MHz with CL15 (15-15-15-35 -1T) 

 or

- 3200MHz with CL16 (16-16-16-36 -1T)

 

I tried to find some info on this, but couldn't get a definitive answer on whether there is actually any difference in terms of performance. 

I don't know what you're testing with, but when you find the speed you like, I'd do a few runs of memtest86 to verify stability.

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Posted · Original PosterOP

run some aida64 cache\ memory benchies to see how they perform at different speeds\timings or maxxmem

 

This is actually a very good idea. I will do that! Thanks! :)


CPU: Intel Core i7 5960X @4.5GHz cooled by Corsair H110 | MBO: ASRock Fatal1ty X99M Killer | RAM: GEIL Evo Potenza 16GB DDR4 3333MHz | GPU: Zotac GTX1080 Founders Edition | SSD: 512GB Transcend 370S | HDD: 1.5TB WD Green Drive | PSU: Corsair SF 600W | Case: Jansbo UMX3 S

Check out the build log here -> http://linustechtips.com/main/topic/257949-analogs-project-rrh-red-riding-hood/           Another build log featuring Power Mac G5 case that I never got around to uploading the latest pictures of -> http://linustechtips.com/main/topic/454140-analogs-project-silverine-ft-apple-powermac-g5-case-modding/      Latest Build Log -> UPCOMING

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This is actually a very good idea. I will do that! Thanks! :)

would you be kind enough  to post your results?

 

I did some tests of my own out of curiosity and for the sake of science. im curious to see how much ddr3 differs from ddr4 in this benchmark.

 

I tried to keep cpu as close to 4.7 as possible with cache at 1:1 ratio

 

im using this kit here      http://www.newegg.ca/Product/Product.aspx?Item=N82E16820104347&cm_re=2666_predator-_-20-104-347-_-Product

 

ran 3 tests

 

2800 cl 11

 

3000 cl 12

 

3200 cl 13 (well almost 3200)

 

 

2nbamwg.png

 

 

2u757pu.png

 

 

2jc7zep.png


Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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Posted · Original PosterOP

would you be kind enough  to post your results?

 

I did some tests of my own out of curiosity and for the sake of science. im curious to see how much ddr3 differs from ddr4 in this benchmark.

 

I tried to keep cpu as close to 4.7 as possible with cache at 1:1 ratio

 

im using this kit here      http://www.newegg.ca/Product/Product.aspx?Item=N82E16820104347&cm_re=2666_predator-_-20-104-347-_-Product

 

ran 3 tests

 

2800 cl 11

 

3000 cl 12

 

3200 cl 13 (well almost 3200)

 

 

Yeah, sure, I will post some results, but I didn't save the ones I made yesterday so I will have to run the benchmarks again when I get home from work. :)

 

I remember, thought, that actually 3000MHz at CL15 was a a bit faster than 3200MHz at CL16. There was like 0.5-0.6ns difference in favor of the former. 


CPU: Intel Core i7 5960X @4.5GHz cooled by Corsair H110 | MBO: ASRock Fatal1ty X99M Killer | RAM: GEIL Evo Potenza 16GB DDR4 3333MHz | GPU: Zotac GTX1080 Founders Edition | SSD: 512GB Transcend 370S | HDD: 1.5TB WD Green Drive | PSU: Corsair SF 600W | Case: Jansbo UMX3 S

Check out the build log here -> http://linustechtips.com/main/topic/257949-analogs-project-rrh-red-riding-hood/           Another build log featuring Power Mac G5 case that I never got around to uploading the latest pictures of -> http://linustechtips.com/main/topic/454140-analogs-project-silverine-ft-apple-powermac-g5-case-modding/      Latest Build Log -> UPCOMING

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Posted · Original PosterOP

@ProKoN

 

I did some more testing and benchmarking and I found some interesting stuff. I wasn't able to replicate yesterdays result with the 3200MHz overclock, but I did some other stuff. Keep in mind this is not a motherboard-certified memory kit. For my board there are only two kits of and over 3000MHz that are certified to work. 

 

CPU: 4.4GHz

Cache: 3GHz (Stock)

RAM: 3000MHz 15-15-15-35

 

RTjS6Dw.png

 

CPU: 4.4GHz

Cache: 3GHz (Stock)

RAM: 3000MHz 16-16-16-36

 

AajhWLP.png

 

CPU: 4.4GHz

Cache: 3.5GHz

RAM: 3000MHz 16-16-16-36

 

Interestingly, I cannot get the memory to run at CL15 with the cache overclocked. I played around with the system voltage, but it didn't really add to the stability at all. That was also something that I noticed yesterday when I managed to boot at 3200MHz speeds, even though I kept the RAM at CL16. 

 

1eFdrSO.png

 

 

The last preset feels quite a bit more snappy in Windows compared to the others. Despite that the differentiation in the latency is only marginal. 

 

PS: Since I am bit new to memory overclocking, could you explain what exactly is the Command Rate and how it impacts performance. I am interested, because my motherboard has it pre-configured to 2T, but it is impossible to get the memory to run at 3000MHz without setting it at 1T. Also, at 1T Command Rate all programs seem to load considerably faster. Also the Windows turns on and off more rapidly. 


CPU: Intel Core i7 5960X @4.5GHz cooled by Corsair H110 | MBO: ASRock Fatal1ty X99M Killer | RAM: GEIL Evo Potenza 16GB DDR4 3333MHz | GPU: Zotac GTX1080 Founders Edition | SSD: 512GB Transcend 370S | HDD: 1.5TB WD Green Drive | PSU: Corsair SF 600W | Case: Jansbo UMX3 S

Check out the build log here -> http://linustechtips.com/main/topic/257949-analogs-project-rrh-red-riding-hood/           Another build log featuring Power Mac G5 case that I never got around to uploading the latest pictures of -> http://linustechtips.com/main/topic/454140-analogs-project-silverine-ft-apple-powermac-g5-case-modding/      Latest Build Log -> UPCOMING

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15-15-15-35 -1T are pretty nice memory settings at 3000mhz, what voltage are you using for it?


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Posted · Original PosterOP

15-15-15-35 -1T are pretty nice memory settings at 3000mhz, what voltage are you using for it?

 

I am using 1.35V


CPU: Intel Core i7 5960X @4.5GHz cooled by Corsair H110 | MBO: ASRock Fatal1ty X99M Killer | RAM: GEIL Evo Potenza 16GB DDR4 3333MHz | GPU: Zotac GTX1080 Founders Edition | SSD: 512GB Transcend 370S | HDD: 1.5TB WD Green Drive | PSU: Corsair SF 600W | Case: Jansbo UMX3 S

Check out the build log here -> http://linustechtips.com/main/topic/257949-analogs-project-rrh-red-riding-hood/           Another build log featuring Power Mac G5 case that I never got around to uploading the latest pictures of -> http://linustechtips.com/main/topic/454140-analogs-project-silverine-ft-apple-powermac-g5-case-modding/      Latest Build Log -> UPCOMING

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@ProKoN

 

The last preset feels quite a bit more snappy in Windows compared to the others. Despite that the differentiation in the latency is only marginal. 

 

PS: Since I am bit new to memory overclocking, could you explain what exactly is the Command Rate and how it impacts performance. I am interested, because my motherboard has it pre-configured to 2T, but it is impossible to get the memory to run at 3000MHz without setting it at 1T. Also, at 1T Command Rate all programs seem to load considerably faster. Also the Windows turns on and off more rapidly. 

 

that bandwidth is pretty epic. The quad channel is really shining in the benchmarks. funny you say you can notice a difference with the different latencies. others report the same thing. I personally cant tell the difference between ddr 1600 cl9 and ddr3 2400 cl9.

 

im no expert in memory overclocking.  command rate is basically a latency setting. as with all latency settings the lower the value the "quicker" your memory will perform. 1T is the most desirable command rate value so keep it there.it was more of a thing back in the ddr2 days where the difference in command rate may equate to marginal performance gains\losses. with ddr3 its not even within margin of error for the most part aside from synthetic memory benchmarks which are kool and neat but really i dont think are indicative of real world performance for the most part.

 

really good read. thank you for posting your results. if your ever bored take out a couple mem chips and run some dual channel results :)

 

your 20mb cache + ddr4+ quad channel is hauling ass :)


Mainboard Asrock Z170 OCF CPU 6700k RAM Tridentz 3600 HDD Intel 730 240gb GPU GTX 780ti sc acx PSU Silverstone Strider 1200W  Case Antec 900 Laptop Lenovo Thinkpad T520 build log-   http://linustechtips.com/main/topic/35809-antec-900-the-re-birth-of-a-legend/ Check out the Tech Center https://www.youtube.com/user/prokon24/videos LTT's Unicore King

 

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Posted · Original PosterOP

@ProKoN

 

I did some further testing just for the fun of it. I had to back the CPU overclock down to 3.6GHz, the BLCK to 120 and to put the CR back to the default setting of 2T, but I did manage to get to 3200MHz, while still running the RAM at 1.35V. 

 

CPU: 3.6GHz

Cache: 3GHz (Stock)

RAM: 3200MHz 16-16-16-36-2T

 

dxNVFSn.png


CPU: Intel Core i7 5960X @4.5GHz cooled by Corsair H110 | MBO: ASRock Fatal1ty X99M Killer | RAM: GEIL Evo Potenza 16GB DDR4 3333MHz | GPU: Zotac GTX1080 Founders Edition | SSD: 512GB Transcend 370S | HDD: 1.5TB WD Green Drive | PSU: Corsair SF 600W | Case: Jansbo UMX3 S

Check out the build log here -> http://linustechtips.com/main/topic/257949-analogs-project-rrh-red-riding-hood/           Another build log featuring Power Mac G5 case that I never got around to uploading the latest pictures of -> http://linustechtips.com/main/topic/454140-analogs-project-silverine-ft-apple-powermac-g5-case-modding/      Latest Build Log -> UPCOMING

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