Help with 4790K overclock tweaking > 5GHZ

Afternoon all,

I wonder if I could pick the brains of any experienced OCUK'rs out there to see if I am doing any good with my new 4790K chip and if it is possible to get it to 5GHZ in a sensible fashion? System spec is in my sig.

Currently got it stable with all cores Fixed 4.9GHZ @ 1.29V with C-state on and max temp (spikes) around 70C at 100% load - NB my definition of stable = it will boot into W10, pass POV Ray ALL CPU benchmark, carry out CINEBENCH CPU test without hanging and run AIDA64 Stress Test for 10 mins without hanging, I have yet to get any BSOD in normal use and I am not interested in leaving it for hours at 100%, I'm not doing folding - I only use the computer for desktop work and gaming, although I have HTC Vive arriving soon, which may up the CPU workload a bit...

So, on to my question - I managed to get it to 5GHZ @ 1.4V with max temps (spikes) around 80c but 1.4V is higher than I am really comfortable with for 24/7 use, even with C-state (reduced idle voltage) on, as it will go to 100%/max voltage whenever this is demanded as it is a FIXED o/c (EIST off) to give increased stability...

I've read lots of online guides - from what I can determine 4.9GHZ may be the chip's natural limit (which is pretty good at 1.29V I think? Vietnam chip...) as it requires a big voltage jump to get it stable at 1.4V (that said it will boot into W10 at 1.3V 5GHZ, but not pass CINEBENCH).

My question - is 4.9GHZ my limit, in which case are my O/C bios settings all sensible OR can I tweak any settings (eg BCLCK/VCCIN or other stuff) to make it over the 5GHZ line without upping the VCore voltage?). My memory is Corsair Vengeance Pro, XMP'd to 2133MHZ at AUTO voltages. Cooler is a Corsair H110iGT with GELID TIM applied

Any/all help appreciated!

My Rig



O/C Settings page (top half)



O/C Settings page (bottom half)



CPU Features page

Sig! (was editing 1st post at same time as my sig...)

Ring ratio set to 40x
VCCIN 2.00 might be needed
cpu vcore whatever it takes to get desired clock and use adaptive voltage so the voltage goes down when windows downclocks the multiplier

http://www.overclock.net/t/1411077/haswell-overclocking-guide-with-statistics

The i7 4790k chip was the Devils Canyon chip if I am correct?

Intel promised 5Ghz on air easy with these chips and failed big time.

Andy7 said:

The i7 4790k chip was the Devils Canyon chip if I am correct?

Intel promised 5Ghz on air easy with these chips and failed big time.

Click to expand...

Correct, yes, apparently partly to do with the glue used to hold the heatsink on, which is why you can lower your temps by (risky) de-lidding them. It is however still a lottery, although you can get binned units from places like Silicon Lottery which will do the values stated (for a price!). I think I was fairly lucky with mine to get 4.9GHZ at <1.3V, Anandtech faired less well with their sample (see table)

More on the subject of the Devil's Canyon HERE

Andy7 said:

The i7 4790k chip was the Devils Canyon chip if I am correct?

Intel promised 5Ghz on air easy with these chips and failed big time.

Click to expand...

I think most of them probably wil do 5 ghz on air, as long as you dont plan on using your PC for longer than 30 seconds at a time. They will have hidden that in the small print somewhere.

Ive seen two on here and another forum that i visit regularly that will do 5ghz for 24/7 usage on sensible volts. Any will do 5ghz for a super pi run, but you will end up putting massive amounts of voltage through it to do so.

Idd, hence the 30 seconds at a time I cant even imagine how hot these things run at 1.45v without been delidded. Mine ran at 90 degrees at 1.25v with a custom loop.

I run mine at 4.9Ghz 24/7 which takes 1.39v. Temps were high before delidding but are fine now I just dont think its worth the extra stress on the chip more voltage will put it under trying to hit 5Ghz 24/7.