DDR4-4000: does it make a difference?

[cerealkeller]

Nice article. Good to see that spending more on the high end kits will actually yield results. Although, my z97 OC Formula, 4790K @4.8 GHz and G Skill Trident X 2666 c11 kit actually seems to best the DDR4 memory in max bandwidth at 39 Gb/s

 

[DeathMetroll]

Hi all !

I got a 5820K@4,4Ghz and a RAM kit ready for 3600Mhz but because of my proc OC my RAM is stuck at 2666Mhz....

How did you guy succed in having a 4,5Ghzproc OC AND a RAM kit set to 4000Mhz ?

Thanks for futur answers

The LGA2011-3 (Haswell-E) processors to my knowledge can't run at those memory speeds.

So there's no way I can run that kit to it's max settings ? ok ! Sad news

Thanks for the answer

 

[DAOWAce]

I paid nearly $400 for my 32GB 2800MHz kit a year ago when I upgraded to X99.

I could get a 4000MHz kit for the same price now.

Damnit DDR4 prices, why you do this to me?

 

[harm9963]

This test was made with very powerfull CPU and GPUs, but only with 8GB of RAM. I think there might be a chance, that in benchmarks, the sysmtem runs out of memory and than faster memory can give some more FPS. Maybe if the test was made with at least 16GB of RAM, than DDR-2133 can give same FPS like DDR-4000.

Its very rare for Photoshop to use more than 8GB of RAM, Handbreak never will, and I've yet to see any game use more than 8GB. I personally have 16GB in my system as one day we'll breach the 8GB barrier, but today is not that day.

SOM will burst your bubble, on my rig,290x crossfire ,16 GB was not enough, luckily 67 dollars later got me additional 16 GB, for a total of 32 GB ! One other game Batman AK ,with just one 290x running ,will push over 8 GB easily and ryse wil usel up to 10 GB .

 

[theBest11778]

Arkham Knight doesn't push above 8GB with an Nvidia card. So this is one very specific situation.

 

[Raoul Duke]

I wonder how many boards can run 4000+ MHz memory, wonder if the limitation is fixable by a bios flash or is more intractable.

 

[Madmaxneo]

This test was made with very powerfull CPU and GPUs, but only with 8GB of RAM. I think there might be a chance, that in benchmarks, the sysmtem runs out of memory and than faster memory can give some more FPS. Maybe if the test was made with at least 16GB of RAM, than DDR-2133 can give same FPS like DDR-4000.

Its very rare for Photoshop to use more than 8GB of RAM, Handbreak never will, and I've yet to see any game use more than 8GB. I personally have 16GB in my system as one day we'll breach the 8GB barrier, but today is not that day.

All true but with the background processes running most PC's will go above that amount easily with many of the higher RAM usage games. I went from 16gb to 32gb DDR3 2100mhz and noticed a difference with respect to framerates and better quality higher end settings in games.

 

[batsdude]

"t's great to see how much of a step forward the Skylake memory controller is, even if the IPC performance was underwhelming when compared to Haswell. "

Except that skylake was getting the same bandwidth on 3000 MHz ddr4( 27.4GB/s) that haswell was getting with 2133 MHz ddr3 (27.2 GB/s) according to this very site. Other sites show haswell hitting 28GB/s with the same speed. How is that an improvement in any way? That's a major regression, not an improvement.

Either A). Skylake's memory controller is garbage, or

B). DDR4's latency really does make that extra speed useless, by hampering bandwidth.

So why is skylake praised for having a better controller, when it is demonstrably inferior to haswell?

I believe Skylakes controller is not up to the performance capabilities alleged for the product. Seems like your usual partial development factor.

 

[mmaker]

Very few reviews show any real gain in handbreak I cant help but think something in the test system is exaggerating the results is it just that you run a different handbrake test to most? or is something else wrong maybe ram sub timings?

for example here it was found that g.skill loosened sub timings on a 3200 c14 kit making it no quicker than 3200c16
g.skill provided some sub timings to tweak in a attempt to improve results and it did
http://forums.anandtech.com/showthread.php?t=2472220

It would be good to know the exact timings\sub timings used at each frequency as these can have a huge impact on performance but you are overlooking them

Thanks

Have a feeling he didnt lower the timings when he downclocked the memory.

 

[Wendy Oltman]

DDR4-4000 should provide a massive performance boost for APUs.