"4790k" What is the best way tweak voltage and load line calabration with the new rog z97 motherboards?

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mr91

mr91

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Jan 25, 2013
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Does anybody have any suggestion on how to set up optimal manual voltage settings on a ROG z97 motherboard when using a 4790k.

What is the stock default voltage for the 4790k?
 
Solution
Tradesman1
Make sure you have the latest BIOS, and with the system at default take screen shots of your BIOS settings.. Then just give the auto OC in the BIOS a try say to 4.2 or 4.4, and again take screen shots, that will let you see what all the OC changed and can try lowering voltages like the vCore (CPU), PLL (can normally be lowered a bit), etc
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The manual voltage settings let you overvolt the chip to get a higher OC out of it. The optimal settings depend heavily on how lucky you are with your CPU selection. Some CPUs can clock quite high on stock voltage, some need voltage bumps far earlier, there is no such thing as "optimal", these must be dialed in manually.
 
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You got very lucky! I hope my chip is as good as yours...

I know the stock voltage for my 3570k is 1.8 v - Did Intel set a stock voltage for the 4790k?

" I've seen ranges from 1.1-1.3+ on the forums however I'm not sure what Intel's General Recommendation for the processor is...

I opened this thread to gain some knowledge on my future build and also help someone else that is getting very high temperatures because he set voltage to auto and under load it seems that he is getting higher than necessary and temperatures...
 
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I certainly need to make my questions more clear lol

This is tricky because as you said each CPU is different and testing must be done to determine the optimal setting...

 
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I ordered the Maximus VII IMPACT Z97 and the other OP has the VII HERO Z97.

" I'm assuming the Bios will be similar on both boards and I heard there are new features on the Z97 boards"

 
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1.3v? 1.8v? No way.
1.5v straight kills your chip in minutes, at 1.8v you probably just hear some little noise and then have your chip and possibly socket dead.

1.3 is the 'long term use' maximum for haswell, if you can cool it.

And there is no 'stock voltage for any chip. Each needs other amounts of voltage to run. I think the highest ive seen for the 4790k on stock speed was 1.2v, hence why I said between 1.1 and 1.2v.

I've been indeed quite lucky on my chip. I can reach 4.9ghz with 1.38v on a 4 vrm phase motherboard. I'm quite sure it would do 5ghz on 1.45v, but im not going to test that with my cooler and motherboard. It has all just been testing anyway, I run my chip at 4.4ghz on all cores. Anything above that isn't worth it to me, temperature*voltage/performance wise, yet.

About why you started this topic: Yes, a lot of motherboards with non updated bios versions heavily overvolt the 4790k on auto settings. My board on bios F1 would power a full 1.36-1.42v into my chip at stock. After getting F6, it gets me 1.156v under load and a bit more in idle (llc turned one) after speedtests, before going to 0.9-1.1 in idle. Thats a quite good behaviour, except for the high llc take.

So if you're worried about that, just manually set your voltage to the lowest possible that allows to boot and then add another 0.03v to be fully stable. If it boots at 1.15v, give it 1.18v until you install the OS and have time to tweak/flash the bios.
 
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Make sure you have the latest BIOS, and with the system at default take screen shots of your BIOS settings.. Then just give the auto OC in the BIOS a try say to 4.2 or 4.4, and again take screen shots, that will let you see what all the OC changed and can try lowering voltages like the vCore (CPU), PLL (can normally be lowered a bit), etc
 
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Solution
What about Load line calibration? "I'm assuming I should follow recommendations in the bios"

I'm aware the voltages fluctuate however I was under the impression that Intel suggested a maximum voltage for a particular CPU under load, the same JEDEC recommends 1.5 volts for their DDR standard.

I'm not sure why I thought that Intel's recommendation for the 3570k was 1.18v @ max load for stock speeds...




 
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What's your cache ratio and cr voltage running at for that 4.9? 1:1 cpu/cr?

And yeah, stock voltage for mine is 1.06 and 1.20 at load/turbo.
 
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To be honest, no idea. I didn't bother with these settings manually yet, but my motherboard automatically puts uncore ratio to 4.4ghz. I didn't bother as anything above 4.7ghz at 1.27v was just for testing, I'm not capable of cooling more with my scythe mugen 4.
 
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Ahh, I see, that's pretty damn good then. Experienced overclockers have a whole mess of benches with 1:1 ratios and 1:- ratios, and there's not really a significant increase or decrease in performance depending upon the size of the gap (around .7), but I think it's probably best to still try closing it as much as possible if the chip can handle it. From what I've been seeing, the cache ratio definitely has an impact upon all other factors when overclocking though and is probably why they suggest to mess with the cpu clocks before the cpu cache.



 
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I'll definitely start messing with that once I get a better cooler and attempt on a 24/7 oc. I'm currently back to base clock (high ambient) and will go back to 4.7 when it starts getting cooler (28->20 ambient). By then, I'll also adjust other setting other than just cpu voltage and ratio.
 
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I was thinking that 1.06 to 1.20 would be the range for a chip like this.

" When cpu is set to voltage the voltage would go beyond 1.2 on the motherboards I've tested"

I have a friends with ROG motherboards and I find that they are generally lot more stable than my midrange gigabyte motherboard however I'm aware that there are many other factors such as luck in the cpu lottery and proper case and cooling...




 
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With my gigabyte and bad luck in the Silicon, I left my 3570k at stock, set the voltage to 1.18, load line calibration was set to normal to ensure my voltage doesn't jump around during load. My max temperatures are about 75 when using occt which is good for me...

I'm looking forward to my next build below are the specs, I'm just waiting for the motherboard to arrive...

Case: Corsair 380T
PSU: Corsair 860i
MB: Asus Maximus VII Impact z97
Ram: Corsair Vengence pro 16 gb
CPU: 4790k
Cooler: H 100i
VC: Asus 780 ti reference
Outlet with dedicated circuit for stable power


I'm going to play around with the stuff the rig, I hope I do well in the silcon lottery lol
 
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Please help this guy he updated his bios however he still has high temperatures...
 
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looks like your vcore is high in occt.
 
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Core temp shows 1.2 and a bit which is okay but it's seem like your occt vcore is 1.8+
strange...

I would try to find the lowest voltage that keeps your cpu stable to lower the temps
 
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The motherboard has nothing to do with the voltage a cpu needs at a certain speed.
At most, it determines the required voltage on auto settings better than another one.

For example, my mid range board would give my cpu 1.36v with bios version F1.
After updating it to F6, it gives 1.156v. I need 1.154v to be fully stable with xmp enabled.
Now, the best motherboard would possibly give 1.154v instead of 1.156v. Change? Unnoticeable, no differences in anything. The voltage jump is far too small to do anything.
 
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In occt his vcore is 1.27. It's the VID in occt that means cpu vcore. Vcore in occt means VCCIN, which is the input voltage to the integrated voltage regulator.
 
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