Help Overclock X99 5930k/Ram Timings

[crasherkid]

Hello, first post here
I need a little bit of help OC'ing my new X99 system.
On my previous Z97/4790k I was able to hit 4.7GHz but the temps were quiet high so stepped it down to 4.6 for 24/7 use which was fine. The ram used there was HyperX Fury (1866MHz) OC'd to 2133 which was perfectly stable.

Anyways, fast forwarding I now have a 5930k/Gigabyte Gaming 5 with Vengeance LPX 2800 ram.
Is it better to push the ram higher at the expense of higher Cas timings or drop the ram speed for higher CPU clocks?

 

[hunkeelin]

ddr4 runs considerably cooler compare to ddr3.

 

[crasherkid]

So are you saying push the ram to 3000 and it should be fairly stable with a cpu clock bump?

 

[hunkeelin]

you can do it incrementally. I personally never OC my rams.

 

[exar333]

I would honestly not push your ram too much. Not sure on your x99 hardware, but a lot of motherboards/memory controllers do have issues above 2900mhz. It may take a lot of tweaking to get it stable, for little or no real-world gains. I would say bump up the voltage a bit and go for the best timings at 2800mhz...

 

[flexy]

Absolute best article on this subject:

http://www.anandtech.com/show/7364/memory-scaling-on-haswell/3

Check the tables, like:

 

[crasherkid]

Thanks Guys.
Flexy, with that article being related to DDR3, how does it compare to my DDR4 ram?