Ok, didn't test so much at 1.2v.

4.2Ghz @ 1.15v, prime95 stable for 10 minutes.

Now reduce to 4.2Ghz @ 1.100v. Going to settle for 4.2Ghz and see how low I can set the voltage.

Not too sure why Vcore on CPUz is higher at 1.129v. When I set to 1.200v in bios, it will quite accurately show 1.198v in CPUZ. When I set to 1.150v, it showed 1.153v

Temp : 72'c with closed side casing.

This post has been edited by kmarc: Jun 17 2013, 02:24 PM


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Good thing is that your 4670K, have quite same temperature per core, in idle and load.

From what I noticed, can vary up to 5'c. That's normal?

Right, reduced the voltage to 1.050v in bios but vcore still showing 1.129v . Exactly the same as when I set at 1.100v
- don't know whether the motherboard is automatically feeding more voltage or not.....

Whooaaaa...... I didn't notice the CPU cache voltage was default at "override" setting. Was running at 1.200v Set it to adaptive at 1.05v like the cpu setting.

Update : BSOD error 124. Increasing CPU vcore back to 1.100v. Dunno whether any difference as CPUz still show 1.129v

Update 2 : 30 mins stable at 1.100v..... 2 1/2 more hours to go.....

This post has been edited by kmarc: Jun 17 2013, 03:23 PM

Better then normal.......mostly one (or 2) core are offset 10+... C.

I see.....

Prime at 1 hour still ok. No BSOD. I just can't understand why cpuz vcore is the same whether I set 1.05v or 1.10v in bios....

Update : Almost 2 hours. So far so good. Gonna have to stop soon. Quite happy with this OC.

Temps are with closed side casing in aircon room.

Gonna try with gaming later. If stable, this will be my OC NEXT TIME! Going to run at stock for now as CPU powahhh is more than adequate....



This post has been edited by kmarc: Jun 17 2013, 04:46 PM

Your A-Tuning report CPU Voltage 1.726V ?

This post has been edited by stasio: Jun 17 2013, 04:57 PM

Some noob question. I oc-ed my i5 to 4.5ghz at 1.2v. When I stress test using msi's tool its stable but prime95 not stable. Is my voltage not enough?

Currently there is only one reliable stability app for Haswell which is prime95 27.9. Custom blend.

Theres 4 ways to clock
Fully manual
Adaptive
Offset
SVID

adaptive issue is the vcore can be more than what u set.
So far seems manual on vcore n ring bus with offset on vcssa/cpu io d/a is the best. Fully c-state.

Getting HOT here...intending to join <but> waiting my hero & 780s today

I used custom blend with the settings you recommended on first page. It'll be fine for 15mins but longer than that crashes.

Type RAM use?

It could be CPU or RAM setting issues.
Try not to touch the memory settings but let it auto then focus on CPU clocking first.
Increase your vCore necessarily.

Corsair Vengeance 1600mhz.

I set the ram to xmp.

Costa Rica chips,still a couple of weeks to be retail.....

I tried again with the same settings for prime95. If more than 15min bsod appears. Ram settings at auto.

Up ure vcore.
Its something to do with the ivr. But overall u can leave ure vcore at that. Ure good to go. Just recheck with aida from total stress test n games like bf3 n metro last light.
Ppl like owikh , stasio n even me. We need more stability cause of mem clocking. Most of the mem clocking we do are all custom etc n to check those timings right we run stress test. We need to take out vcore as a issue from any instability we face.

Try increasing your vCore? 1.3v-1.4v? Just in case if your chip is a lemon

I was told that was Vccin.

Too high OC? My 4670k BSOD after stressing at 4.4Ghz @ 1.2v. Had to reduce to 4.3Ghz @ 1.2v then more stable.

I see. So it is the adaptive setting....

Hmmm.... I might just settle for adaptive setting.... see see how.....

Try reducing to 4.4Ghz or 4.3Ghz or increase your CPU voltage. What's your temperature on stress test?