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4.2Ghz Need some Expert help Please

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CPUs Authority
Overclocking Authority

Hello :hello: 

I'm actualy trying to get 4.3Ghz benchable so I thought to start with getting 4.2Ghz stable. Need some help please!

I've currently got 4Ghz stable, Here are the settings I'm using:

20 x 200
QPI Clock Ratio: x36
Uncore Clock Ratio: x14
Uncore Frequency: 2800mhz
Isochronous Support: Enabled (No idea what that does)
PCI Express Frequency: 100mhz
Memory Multiplyer: 6.0
Memory Frequency: 1200mhz
Timings (Latency): 7-7-7-21
Command Rate: 1
Load-Line Calibration: Enabled
CPU Vcore: 1.28750V
QPI/VTT Voltage: 1.295V
IOH Core: 1.180V
DRAM Voltage: 1.600V
CPU PLL: 1.800V
PCIE: 1/500V
QPI PLL: 1.200V
ICH I/O: AUTO/1.500V
ICH core: 1.180V
DRAM Termination: AUTO/0.750V
DATA/Address Vref: AUTO/0.750V

........................................................................


4.2Ghz Settings (unstable)

Same settings as above, Unless otherwise specified.

Uncore Clock Ratio: x13
Uncore Frequency: 2730mhz
Memory Frequency: 1260mhz
Timings (Latency): 7-7-7-21 Also Tried 8-8-8-24
CPU Vcore: 1.35625V
QPI/VTT Voltage: 1.355V
IOH Core: 1.260V
DRAM Voltage: 1.620V
CPU PLL: 1.880V
QPI PLL: 1.260V
ICH Core: 1.260V

With these settings I can get into windows and run OCCT for roughly a Minute before it either freezes or I just get a black screen and have to hit the restart button.

I've tryed 4.3Ghz with the same settings as 4,2Ghz, but with the CPU Vcore at 1.408xxV. That failed 3DM06 at the first CPU Test.

Please Note my Gigabyte GA EX58 UD5 has alot of Vdrop/Vdroop For example: 1.28750V in the BIOS is 1.25V in OCCT stress test.

System Spec:
Ci7 920 DO Stepping @ 4ghz HT on 24/7 With TRUE 120 lapped with Push-Pull Config.
Gigabyte GA EX58 UD5 With latest BIOS Update
Gigabyte Radeon HD5850
3 x 1GB OCZ Triple Channel DDR3 1333mhz 7-7-7-21 @ 1200mhz 7-7-7-21
Coolermaster HAF 932
Coolermaster Real-Power M700
Samsung Spinpont F3 500GB
LG DVD ROM Drive SATA
Windows 7 64Bit Home Premuim.


Any help would be greatly appreciated, Thanks for reading. :love: 

More about : 2ghz expert

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CPUs Expert

Try checking your temperatures. Hopefully it doesn't reach 90 degrees C. Also, that vCore is pretty high already. You're almost at 1.4. Try running the memory at lower speeds (ie. 1066 or whatever is closest) and laxer timings (9-9-9-24) just to make sure it isn't the memory causing the problem. If you plan to increase vCore further, you need a better cooling mechanism.
CPUs Authority
Overclocking Authority

Temps at the 4ghz settings are 69 68 68 66 under OCCT for 8 hours

Temps at 4.2Ghz settings (before it crashes) are 72-74, but thats just a minute, might reach 80 if it lasted for a few hours

Dunno what temps are for 4.3Ghz settings, only tryed running 3DM06

Memory is running at its lowest speed, x6 multi is the lowest possible, I'll try 9-9-9-27, but to be honest it should be stable as its rated at 1333mhz 7-7-7-21.
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CPUs Authority
Overclocking Authority

overshocked said:
How does it react when you give it more VTT?


1.355V VTT Doesnt increase stability, Infact at 1.295V VTT its just the same.

Got any suggestions? :o 
CPUs Authority
Overclocking Expert

Try bumping up qpi PLL with the VTT. When i get above 200 base clock the gap between QPI and VTT must get smaller as i raise the voltages, otherwise it will be incredibly unstable.
CPUs Authority
Overclocking Authority

Ok cheers Overshocked, I'll give it a try. You think raising the QPI PLL to 1.320V and leaving the VTT at 1.355V will be enough?

I guess there's only one way to find out......
CPUs Authority
Overclocking Expert

Yeah, that seems reasonable to me. I usually have a .15 difference between the two then decrease the gap as needed so it seems your gap is pretty fine, test it to make sure though.. Also make sure that the difference between vtt and ioh is 0.2v b/c that has been known to decrease stability in some cases.
TBH i usually bench with a vcore of ~1.36 and a vtt as much as 1.6. But some chips like high vtt and some dont.
CPUs Authority
Overclocking Expert

I always only change one setting at a time then reboot all the way into windows.
When i hit a wall i drop the bclock 1 mhz at a time til i find a point where its just stable enough to get into windows. Then i change one setting a a time until it will boot with a changed setting fine.

Ex:
I am overclocking by 5 bclock increments then i hit a wall at 225bclock. I step off the overclock 1 mhz at a time until it will boot into windows flawlessly. For this example 223 is what i ended up booting at. Then i go into the bios raise the setting that i think i need to raise to make it boot at 224 bclock. In this example i raise the vtt to 1.5v. I boot it at 223 base clock and 1.5 vtt, i see if it will boot fine. If not i need to change more settings to allow for that increase in vtt (like decreasing the gap between vtt and qpi). Once i can raise my vtt without a problem booting at 223 bclk, then i raise my base clock to 224 and see if it will boot. If it does then i continue the process. If it doesnt then i step off to 223 base clock again and keep raising voltages.

Get it?

I need to sleep now. It 5:30am here, gnight.
CPUs Authority
Overclocking Expert

Just lookin at the op before i hit the hay, and noticed that you left you Vdimm at 1.60... I doubt it will cause any stability issues the way it is, but out of curiosity why?

When you increase the vtt you can increase the vdimm without stressing the IMC. Just make sure you have within a 0.5v difference between vtt and vdimm.
CPUs Authority
Overclocking Authority

Hmmm....That didnt go so well..

I just 4.2ghz settings, just raised the CPU PLL to 1.320V and used the lowest uncore multi.
Hit F10 and it tryed to boot, but couldn't even get to POST, and kept restarting itself (at this point I almost laid a brick :(  ) So I hit the clear Cmos button and it worked fine ( YAY)

So dunno what happened there, but it didnt like it.

I keep the vdimm voltage at 1.60V because....uhmm...I dunno actually. Its stable I guess. No need to raise it. But if im going for 4.2Ghz I'll raise it to 1.62V or even 1.64V
CPUs Authority
Overclocking Authority

You were right, It didnt like 12x multi for the uncore, 13x got me into windows, but OCCT failed in 8 seconds : /

I then relaxed the memory timings to 9-9-9-27 which didnt help at all.

I then raised the Vcore from 1.35625V to 1.36875V which gave me stability Temps during 20 mins of OCCT were mid 70's.

Looks like 4ghz is the sweet spot for my CPU, I'll bench at 4.2Ghz, but theres no way im using that 24/7

I would need a rediculous voltage for 4.3ghz maybe something like 1.43xxxV Which im not willing to do, not even for a benchmark. Even though 1.38xxxV gets me into windows, ( 1.36V in windows ) as you can tell from my screenshot in the Core i7 overclockers club.

Thanks for your help overshocked + Gracefully much appreciated.

I hope I get a better chip next time : )
CPUs Authority
Overclocking Authority

Yeah, i tryed to get into windows with 4.4ghz HT off with 1.408V but it didnt get past POST : /

I guess it has come along way, I can't complain at a 1.34Gig OC Not to shabby at all.
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