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Help overclocking 3770k on Asus P8Z68/GEN3

post #1 of 7
Thread Starter 
Hi guys,

Just took out my i5 3570k and swapped it for a i7 3770k as i had to give the i5 back....keeping the same settings it boots to windows ok but with a voltage of 1.288v @ 4.5ghz

I'm looking to use offset voltage as i want the CPU to downclock when its not in use.

I thought you set it to auto, take note of what it boosts to itself then go into offset voltage and reduce it by an amount. For example -0.100v would give me 1.188v? is that correct? If so its not booting.

Is there anything else i need to change now i have gone over to a i7 3770k to get it stable?

Whats a good voltage for an i7 3770k at 4.5ghz?
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post #2 of 7
Quote:
Originally Posted by Darylrese View Post

Hi guys,

Just took out my i5 3570k and swapped it for a i7 3770k as i had to give the i5 back....keeping the same settings it boots to windows ok but with a voltage of 1.288v @ 4.5ghz

I'm looking to use offset voltage as i want the CPU to downclock when its not in use.

I thought you set it to auto, take note of what it boosts to itself then go into offset voltage and reduce it by an amount. For example -0.100v would give me 1.188v? is that correct? If so its not booting.

Is there anything else i need to change now i have gone over to a i7 3770k to get it stable?

Whats a good voltage for an i7 3770k at 4.5ghz?

The offset voltage is a calculation based on the VID of the current multiplier (including x16.0 for idling). You also have to take any vDroop into account that you might have, and that depends on your current LLC setting. I recommend Medium so that you can keep C3 and C6 enabled and not have any chance of idle and light-load problems such as lock-ups or BSODs.

So first, set the voltage using a manual voltage until you achieve your desired voltage under full load. While it's under full load, use either Real Temp or Core Temp to see what the VID is for 45. Then, let the CPU idle and take note of its idle voltage. Now, calculate the difference between your idle voltage and the VID for the multiplier of 45. Then, round it to the nearest increment of 0.005V and use that as your offset voltage. Then, check your full-load voltage again using Prime95 to see if you nailed it. If you didn't, then adjust as needed (up or down).

So, -0.100V is subtracting 0.100V from the VID of the 45 multiplier and that's ending up being your core voltage - but again, vDroop plays a role as well (depending on your LLC setting).

I don't know what a good voltage to use is because some Ivy Bridge CPUs need a MUCH lower voltage than Sandy Bridge while others need a similar voltage (clock-for-clock). So, experiment.
Edited by TwoCables - 8/1/13 at 2:25pm
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post #3 of 7
Thread Starter 
It refuses to boot on medium LLC, anything other than ultra high and windows doesnt boot!
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post #4 of 7
Quote:
Originally Posted by Darylrese View Post

It refuses to boot on medium LLC, anything other than ultra high and windows doesnt boot!

That's because there's more vDroop and it's resulting in too low of a voltage. Did you try everything I said, or are you still using -0.100V?
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post #5 of 7
Thread Starter 
I'm using -0.035v at the moment which under load is 1.240 / 1.246v (fluctuating) and idle is 1.000v / 1.008 fluctuating

temps are

79,89,86,81 and its a really hot day today.

I tried -0.040v but am getting BSOD.

I read what you said but im trying to get my head round it.
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post #6 of 7
Quote:
Originally Posted by Darylrese View Post

I'm using -0.035v at the moment which under load is 1.240 / 1.246v (fluctuating) and idle is 1.000v / 1.008 fluctuating

temps are

79,89,86,81 and its a really hot day today.

I tried -0.040v but am getting BSOD.

I read what you said but im trying to get my head round it.

Try this: put a full load on your CPU (like Prime95). Then, open Real Temp or Core Temp and look at the VID. Your -0.035V offset is subtracting 0.035V from this VID. If you had no vDroop at all, then it would be a straight calculation and that would be your full-load voltage. However, there's vDroop, and the amount of vDroop you have depends on your LLC setting.

So what you do is you set your voltage manually, meaning don't use an Offset voltage. Set it to what you want. Then, let it idle and take note of what the idle voltage is. After that, find the difference between this idle voltage and the VID that you see in either Real Temp or Core Temp while the CPU is under full load. Use this difference as your Offset. So at this point, you would go back into the BIOS and switch to the Offset voltage setting and then put this number in, but rounded up or down using the 0.005V increment. If the idle voltage is higher than your VID, then you use a positive offset. If it's lower, then you use a negative one.

If this still doesn't quite make sense, then I can try explaining it another way.
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It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.400-1.424V in Manual Mode) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:) 250 GB Samsung 840 EVO (D:) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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KeyboardPowerCaseMouse
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post #7 of 7
Thread Starter 
So i have a new 3770k now and it seems like a GREAT overclocker

So far i have

4.5ghz @ 1.164v
4.6ghz @ 1.200v

When aiming for 4.8ghz, what would a good voltage / temperature be?

I have a XSPC Raystorm waterloop now too since posting the OP
Edited by Darylrese - 8/15/13 at 3:08pm
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