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Can't push i5-4670K past 4.2 GHz, could use some help

post #1 of 10
Thread Starter 
Hello there. I'm a new member on this forum and would like to request some assistance regarding overclocking my intel i5-4670K CPU which is run on an MSI Z87 G45 motherboard and cooled by a cooler master hyper 212 evo (room temp is about 20 celcius)

After I ran prime95 for two hours on default settings (3.4 GHz) and verified it's stability, I went up to 4.0 GHz and then 4.2 GHz. using only the core clock multiplier and leaving the rest the way it was. At 4.2 GHz the PC was stable running prime95 for over an hour and showed the following temperatures:

lorFluk.png

Now looking at this it would seem that all is well and there is more headroom to overclock. But as soon as I tried to do 4.3 GHz the PC crashed 2 minutes into the prime95 test. I then tried to fine tune the clock speed by changing the bus speed from 100Mhz but even that would not work. Even at ~4202MHz my PC would just refuse to boot. Also, the high voltage use at 4.2 GHz seems to concern me.

Could anyone help me out here? I really hope I didn't lose the silicon lottery this badly....
post #2 of 10
It isn't impossible that your vCore is getting too high.

These chips are pretty voltage sensitive and therefore will require both strict voltage adjustments when overclocking past certain voltage barriers, as well as STABLE power.

As long as your Motherboard has sufficient power delivery, and your PSU is okay You shouldn't have an issue.
post #3 of 10
Thread Starter 
Quote:
Originally Posted by Xinoxide View Post

It isn't impossible that your vCore is getting too high.

These chips are pretty voltage sensitive and therefore will require both strict voltage adjustments when overclocking past certain voltage barriers, as well as STABLE power.

As long as your Motherboard has sufficient power delivery, and your PSU is okay You shouldn't have an issue.

I'm sure my PSU and motherboard are reliable. So what do you suggest I do?
post #4 of 10
I guess you've gotta up your vcore a bit further.

I seem to have gotten a terrible chip? I need 1.296V to hit 4.3 Ghz.
post #5 of 10
Thread Starter 
Quote:
Originally Posted by OCcomet View Post

I guess you've gotta up your vcore a bit further.

I seem to have gotten a terrible chip? I need 1.296V to hit 4.3 Ghz.

How much should I set it to? And what's the safe limit?
post #6 of 10
I'm not too familiar with haswell. I haven't had a chance to oc any builds but I know from experience with the past couple generations that too much voltage is like not enough voltage.

I would start over and put better control on your voltages.

It's also possible that your chip just can't do it.
post #7 of 10
Quote:
Originally Posted by xpoizone View Post

Hello there. I'm a new member on this forum and would like to request some assistance regarding overclocking my intel i5-4670K CPU which is run on an MSI Z87 G45 motherboard and cooled by a cooler master hyper 212 evo (room temp is about 20 celcius)

After I ran prime95 for two hours on default settings (3.4 GHz) and verified it's stability, I went up to 4.0 GHz and then 4.2 GHz. using only the core clock multiplier and leaving the rest the way it was. At 4.2 GHz the PC was stable running prime95 for over an hour and showed the following temperatures:

lorFluk.png

Now looking at this it would seem that all is well and there is more headroom to overclock. But as soon as I tried to do 4.3 GHz the PC crashed 2 minutes into the prime95 test. I then tried to fine tune the clock speed by changing the bus speed from 100Mhz but even that would not work. Even at ~4202MHz my PC would just refuse to boot. Also, the high voltage use at 4.2 GHz seems to concern me.

Could anyone help me out here? I really hope I didn't lose the silicon lottery this badly....

Hi mate ,
I will do this which i am myself trying right now for 4.5Ghs OC @ 1.24~5V

1. Check all stock voltage's from BIOS and note down.
2.Now changing CPU core ratio x multiplier ( x 100 ) -> 42 x 100
3.Change Vcore -> Stock to say 1.20V ,
Leaving Uncore voltage - Stock Voltage ,
Set Uncore to 35 /36.
Put all other voltage on stock and disable adaptive settings ( C states )
4.Boot into windows and do Intel burn test followed with x264 benchmark testing.
5. Read Haswell OC guide here as the thread creater has same board as yours.
Blue X7
(12 items)
 
Blue X5
(15 items)
 
 
CPUMotherboardGraphicsHard Drive
5820K  Asus Rampage V Extreme Rx 480 8 GB Samsung 256 Evo 
CoolingOSMonitorKeyboard
Corsair H110i MS Win10 64 Pro Dell ST2220L Logitech G110 
PowerMouseMouse PadAudio
Corsair 1200AXi Razer DA Chorma Razer Goliatus Control Asus DGX 
CPUMotherboardGraphicsRAM
i7 4770k Asus Z97 Maximus Ranger  GTX 760 Gskill 2133 2x4 GB 2133Mhz 
Hard DriveHard DriveCoolingOS
Samsung 120 Evo WD 2TB Green Corsair H100i GTX Win 8.110 Pro 
MonitorKeyboardPowerCase
Dell ST2220L Logitech G105 Seasonic S12 II 620W Corsair 300R 
MouseMouse PadAudio
Razer Death Adder 2013 Razer Goliatus Control Asus DG 
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Blue X7
(12 items)
 
Blue X5
(15 items)
 
 
CPUMotherboardGraphicsHard Drive
5820K  Asus Rampage V Extreme Rx 480 8 GB Samsung 256 Evo 
CoolingOSMonitorKeyboard
Corsair H110i MS Win10 64 Pro Dell ST2220L Logitech G110 
PowerMouseMouse PadAudio
Corsair 1200AXi Razer DA Chorma Razer Goliatus Control Asus DGX 
CPUMotherboardGraphicsRAM
i7 4770k Asus Z97 Maximus Ranger  GTX 760 Gskill 2133 2x4 GB 2133Mhz 
Hard DriveHard DriveCoolingOS
Samsung 120 Evo WD 2TB Green Corsair H100i GTX Win 8.110 Pro 
MonitorKeyboardPowerCase
Dell ST2220L Logitech G105 Seasonic S12 II 620W Corsair 300R 
MouseMouse PadAudio
Razer Death Adder 2013 Razer Goliatus Control Asus DG 
  hide details  
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post #8 of 10
Hey you asked me to reply to your thread here, Try turning off c-states, turning off VR efficiency, and also try going for fixed voltage with fixed multiplier first to accurately test how high your CPU can go. 1.3v is pretty safe for testing, I have taken mine to 1.4v for suicide runs, but wouldn't recommend over 1.3v for 24/7. So try all the settings I just recommended with 1.3v and 4.3ghz and if you hit 4.3ghz then you know you just needed a bit more voltage, if you didn't then you will know that you just have lost the silicon lottery lol.

However another theory about Haswell that I have is that they can get internally too hot before the heat can reach the IHS, so delidding is recommend (by me, at your own risk) on these chips (I have done so myself and am at 4.6ghz stable 24/7, can do 4.8 but not worth it with the diminishing returns).

Good luck with it all and if you have any questions please let me know.

Kind Regards,
-Bryan
post #9 of 10
And also leave the ring bus speed on auto with auto voltage when starting off, you can find that later.
post #10 of 10
If you've got an Asus Motherboard this is a good place to start:

http://www.youtube.com/watch?v=Z7zPu9255ZI

I did my overclock looking at that. Hope it helps.
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