Does Haswell-E also benefit from higher clocked DDR4?

[njdevilsfan87]

Plenty of reviews have shown Skylake to benefit ~10% clocking DDR4 from 2133 to 3000+. I think this is the first time since the DDR days I have seen any such impact. I'm not even sure if those reviews tried running 2T vs 1T on the memory alongside frequency increases.

Does Haswell-E also respond in such a manner? Being qaud channel, it has double the bandwidth of Skylake, so it may not benefit. But if it does, I will look into getting some 3200+ speed memory. I just want to be sure it does, because while DDR4 is dropping in price nicely, the high speed 32GB kits are still quite expensive.

 

[alcoholbob]

It can be hard on some mobos to go above 2666 without blck overclocking.

Might just be easier to tighten the timings or drop command rate to 1T.

 

[Absolute0]

I think the answer is not really

Benchmarks show an effect, but VERY minimal...

http://www.anandtech.com/show/8959/...to-3200-with-gskill-corsair-adata-and-crucial

 

[LTC8K6]

I think you need to have higher speed DDR4 with better timing numbers to start to show a benefit.

I think such modules are just beginning to show up?

 

[njdevilsfan87]

That is also an option. Though those 3200+ sets can probably achieve some very low CL at lower frequencies like 2666 1T. I had a 16gb set that was stable running CL14 2666 1T at 1.25v, but I needed more memory. My 32gb set is crap in comparison. It can't even do CL16 2666 1T 1.3v stable.

 

[ShintaiDK]

Unlike Skylake, it got quadchannel + 15-20MB cache. So the benefit is minimal. The latency would be the best bet for any benefit.

 

[ElFenix]

I think the answer is not really

Benchmarks show an effect, but VERY minimal...

http://www.anandtech.com/show/8959/...to-3200-with-gskill-corsair-adata-and-crucial

should have been tested using less than all channels as well.

 

[alcoholbob]

I actually run my 32gb ddr4 2800 cl16 2t set at 2666mhz cl14 1t @1.28v. It's probably faster that way.

 

[cbn]

Unlike Skylake, it got quadchannel + 15-20MB cache. So the benefit is minimal. The latency would be the best bet for any benefit.

Ark lists i7 5820K as supporting DDR4 1333/1600/2133:

http://ark.intel.com/products/82932/Intel-Core-i7-5820K-Processor-15M-Cache-up-to-3_60-GHz

How about quad channel @ DDR4 1333 with tight timings? Or maybe quad channel DDR4 @ 1600 with tight timings?