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I5 760 OC. Issue with Voltage

Last response: in Overclocking
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April 25, 2012 9:38:54 AM

Hello everyone.

It's been a few hours since i completed my first OC to my i5 760 from 2.8 to 4ghz. But i had many issues with stability.

First things first, this is my rig:

CPU: i5 760 (2,8GHz)
Case: Silverstone RV-02
Cooler: Scythe Mugen 3 Rev B. (With 1 fan in pull configuration
M/B: Gigabyte P55A-UD4
RAM: Corsair Vengeance Dual kit 8 gb @ 1600 9-9-9-24
PSU: CoolerMaster Pro 600W Gold Edition

My OC settings are as follow:

Multiplier: 20x
BCLK: 200
X.M.P.: Enabled
SPD: 8 (Memory from 133x10 OCed to 200x8)

Vcore: 1.34 (1.312V in CPU-Z)
LLC: Enabled
QPI/VTT: 1.270
PCH: Auto
PLL: 1.870
DRAMv : 1.600

All C-states, EIST and Turbo-boost are disabled.

First of all, at those settings under 100% my system remains stable for 5 hours under P95 and 20 passes of intel burn test.
Cpu temps are at about 30-35 when idle and 70-74 under 100% load with IBT.

No matter what i did, my system could not remain stable at 1.3v as other guides say. The same goes for LLC. If i disable it whenever my cpu goes to anything above 50% load i get BSOD.

And another question. My temps seem to range between cores both under load and idle.
c0 = 35c, c1 = 30c, c2 = 33c, c3 = 29c.
The same pattern exists when the cpu is under load
c0 = 75c, c1 = 70c, c2 = 71c, c3 = 28c

I would like to know if there is something wrong with my settings.

More about : 760 issue voltage

April 25, 2012 12:36:24 PM

You can try Disabling the XMP profile and set the timings and volts manually. Might wanna try 1.65V on the ram if it is that voltage that it is rated for.

Did you dial in 1.34000V in the CPU Vcore? Or is that on AUTO? AUTO settings in boards tend to ovevolt.

If you want power savings after you complete the OC tell me to help you with CPU VCORE : Normal and using DVID + Volts.

a b à CPUs
a b K Overclocking
April 25, 2012 1:15:39 PM

Well it takes a lot to get Lynnfiled i5/i7 to get 4ghz and higher. Once you push past 3.4ghz for every 200mhz from then on you are adding roughly 20-30w more to the total power consumption. So what all else do you have drawing off that psu considering that at 4ghz that cpu is drawing around 180-200w under full load at those volts?

As for mine I settled down for more conservative overclock. i5 760 @ 3.53ghz with turbo enabled with the vcore set to only 1.12 after vdroop.
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April 25, 2012 1:32:15 PM

The ram is rated for 1.5v. By default it is set @1333MHz but it is rated for 1600 and i know many others who had an easy time getting it to 1600.

I dialed the Vcore manually. I chose the value through trial and error. 1.34 is the point where i dont get BSOD or boot failures.

As far as power saving goes i managed to enable Eist by tinkering the PLL. System runs stable so far with PLL @1.870 and EIST(speedstep) enabled.

Quote:
Well it takes a lot to get Lynnfiled i5/i7 to get 4ghz and higher. Once you push past 3.4ghz for every 200mhz from then on you are adding roughly 20-30w more to the total power consumption. So what all else do you have drawing off that psu considering that at 4ghz that cpu is drawing around 180-200w under full load at those volts?

As for mine I settled down for more conservative overclock. i5 760 @ 3.53ghz with turbo enabled with the vcore set to only 1.12 after vdroop.


My first target was 3.3GHz. I got there with stock voltage and 1333MHz on the ram. It was stable and with low temps. I didn't consider this to be a "legitimate" overclock since i only changed the multiplier and the BCLK by 20 from stock values.

My GPU is a Sapphire HD4670. Will soon upgrade to an HD7850.
-1x WD SATA HDD 750GB 7200 RPM
-1x DVD-RW
-1x liquid neon lamp (which i use mainly when i need to peer inside the case)
-3x 210mm Fans Low RPM
-2x 120mm fans (including the one on the cooler

My PSU is 600W and rated gold. Its 4 months old.


I wanted to achieve 4GhZ mainly as an "achievement", to have that feeling of success that i did it. :p 
My main target is to get to a level where it won't bottleneck the HD7850 i plan to buy and it will provide and also to improve gaming experience. For that i believe a 3.5-3.8 would be a better OC. What do you think?
April 25, 2012 1:46:05 PM

Try something else : Set 170 BCLK, specifically ENABLE Turbo Boost Technology and DISABLE C1E, C3/C6/C7. That way the turbo will kick in but wont go beyond X21 (or X22 for i5 760). You might achieve better MHZ vs Consumption that way.
April 25, 2012 1:47:42 PM

P.S. Post a link of the RAM, i don't know what you mean it is rated 1333 and then say 1600 CL9. All kits can do 1333.
April 25, 2012 6:35:34 PM

darkling said:
P.S. Post a link of the RAM, i don't know what you mean it is rated 1333 and then say 1600 CL9. All kits can do 1333.


http://www.newegg.com/Product/Product.aspx?Item=N82E168...

This is my kit. What i meant was that because of the default BCLK they work at 133x10=1333MHz



Also i tried a few things. First of all i disabled X.M.P, got the rams to 1600 and left the voltage @ 1.5v. It passed 5 times on memtest.
Also i lowered the voltage a bit to 1.325 from 1.4 with EIST and Load-Line Calibration enabled.


Darkling i will keep your suggestion in mind. Can you please provide me a few more details?

i should set it at 170x20 or x21? or maybe another multiplier?
Should i leave EIST enabled?


April 26, 2012 7:43:32 AM

You must first decide if you want your PC to run full speeds the whole time. If you decide to lower multipliers and voltages when it idles (surfing, watching video) you can't have manual CPU voltage cause it will stay that way.

Enter bios and load setup defaults then only enter Advanced Voltage Settings and select CPU VCORE : NORMAL. That will show you your VID. Enter windows and open CPU-Z, open something that will require CPU activity and see the volts used. If it uses lets say 1.2V you know you need at least 0.1V to be stable when you OC. So choosing NORMAL VCORE and adding +0.10000V using DVID (Dynamic VCORE) will allow you to enable EIST and downclock on idle.

Check an example here about using CPU VCORE : Normal and DVID.
http://www.techreaction.net/2010/09/01/overclocking-wit...
!