Received my 4790K today, Batch number X508C179
So it's a February chip from Vietnam

Overclock on Air
4.8Ghz = no luck at 1.305V, I'm looking for a 24/7 balance, hence that voltage is too much for me


4.7Ghz = 1.275V , I think this might be the sweat point, now looking for balance of heat and power consumption
*Stress test, >80 self restart (Lucky didn't kill my CPU)

4.6Ghz = 1.25V, AIDA64 Temperature <80C
1.24V AIDA64 Temperature +-75C (Cannot pass Stress Test)

4.5Ghz = 1.2V, Not Stable
1.2V, AIDA64 (Stress 10 minutes) Temperature 68c

Final = 4.5Ghz 1.214 Temperature 68+-


This post has been edited by rudolfjie: Jun 20 2015, 01:33 AM

So, in the end, what speed + voltage you running at?
And... it's time to move to water cooling

Apparently my CPU not a great one, 4.5Ghz @1.214V (I saw some at 1.18v )
So far happy with <70C during stress test. However after I change from manual voltage to adaptive, even thought I set my OC voltage at 1.214v, But still the CPU crank up to 1.29 during stress test.. Offset auto..
At the end I set my offset to -0.075 to achive 1.214v. Is that normal?

This post has been edited by rudolfjie: Jun 20 2015, 01:38 AM

Guys, Sifu, Guru.... Please correct me if i'm wrong
Currently My 4790K Stable at 1.22v
Once I change the voltage from manual to ADAPTIVE, It shot up to around 1.28v even my OC Voltage set at 1.22v

So in order to achieve my 1.22v with adaptive. I applied an offset of 0.06
(1.29-0.07 = 1.22v)

Volla, now idle around 0.65v, Full Load 1.22v (Yup, 1.22 for 4.5Ghz doesn't looks good... no luck on chip lottery)
So far stable, but is my way correct? or there's other way of applying adaptive ?

Thanks and much much appreciated for any answer

This post has been edited by rudolfjie: Jun 22 2015, 12:38 PM

use adaptive and disable that SVID thingy.


This post has been edited by cstkl1: Jun 22 2015, 02:07 PM

Thanks, I will try it tonight
So my way of keeping the peak voltage is wrong?
cos i found it stable. but wanna change it proper way

Sifu, how come no Broadwell CPU in Malaysia ? Anyone here got chance to overclock them ? Although Skylake is going to launch, at least it is cheaper option later ?

And by the time, Skylake launch what will you think DDR4 ram cost be ? Cheapest RM4xx for 8GB kits ?

I've been follow Broadwell news quite some time, here's what i know.
Broadwell not design for overclock, although there's someone who push to 5Ghz on air @ over 1.419v, but no one can proof that's stable, that guy only able to do a screenshot. but recent review, there's no one achieve above 4.3ghz. Most of them stable at 4.2 @1.36v (That's very high) http://www.maximumpc.com/intel-broadwell-d...7-5775c-review/

For me, I go with 4790K. Now stable 4.5Ghz @1.22v Cinebench R15 Multicore 900+
IPC broadwell 4.2Ghz = Haswell refresh +-4.5Ghz
Price way higher than Haswell refresh, expect around hundred+ premium, unless u need iGPU (which is very close to GTX750 level).
From history, Intel seldom decrease the price for old products.. it just discontinued.

Skylake will launch at August, expect another 5% gain on IPC. But it's gonna need Intel 100 chipset. Some rumor said it has double IMC, can support DDR3 and DDR4 depend on the MOBO. By that time, everyone getting DDR4, and sooner or later, the price will drop eventually

This post has been edited by rudolfjie: Jun 25 2015, 10:06 AM

Please update mine to the list

i4790k @ 4700 Mhz ~ 1.275V
Asus Z97 Pro Gamer
Air Cooling

Envy , mine can only achieve 4.7 at 1.3x.

For me, anything beyond 4.7 is not efficient.
I need beyond 1.35V to get to 4.8 thus i've decide to settle on 4.7 for daily use.

Want ask some opinion here. This is not related to CPU clockspeed. Just my memory clockspeed. I have 2 units of 8GB Kingston HyperX Fury 1866Mhz RAM.
I can run like these timings:
1600Mhz - 8-9-9-24-1T at 1.55V
1866Mhz - 9-11-10-29-1T at 1.6V

Next step, I did 2133Mhz at all Auto timings . What I get is 11-13-13-35-2T at 1.63V. At first not stable because 50 rounds of Memtest Test 8 : Random number sequence shows at least 4 or 5 errors. So I bump up CPU Digital I/O voltage by offset +0.005V and System Agent Voltage by 0.005V . Now its stable.

However I tried to run 2133Mhz 10-11-10-30-2T at 1.65V , memtest show many errors for Test 8 : Random number sequence. Each round 1 error. So point continue test also.

What else can I do to tighten my timings ???

Current AIDA cache and memory benchmark is :



But i'm still not happy with my timings yet.

From 11-13-13-35-2T at 1.63V to 10-11-10-30-2T at 1.65V is quite a big jump. Why not try tighten the timing bit by bit?

I tried. Only get 11-12-11-30-2T at 1.65v. No luck with higher speeds. My i5 has weak imc.

Should be your memory capability, not imc

woot...nice one!

Guys, does Samsung Green DDR3 YK0s still have value? I have like an extra pair still unboxed lol.

Been missing from the OC world due to change in interest. But still checking out the scene once in a while.

2x4GB or 2x8GB?

Memory Tweaking:

Currently Stable @ 2400Mhz 10-13-13-32 1T



This post has been edited by Radeon: Jul 4 2015, 06:24 PM

2x4GB only