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Please help with i5 2500k OC

Last response: in Overclocking
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June 15, 2011 5:40:50 AM

EDIT: So my question are:

1)What is a safe voltage if I want to OC my i5 2500k to 4.8ghz, 1.4v?

2)What is vdroop, I'm confused there.

3)What are some key things to enable or disable? I've read that you don't want your CPU at max clock speeds and it will down clock it's self when you don't need the power.

4)What temperatures should I stay in at idle and at max load.

5)Are my temperatures okay at idle? pics below.

Okay guys, I've just put this PC together today.

Here's a link to what my PC looks like:
http://www.tomshardware.com/forum/267046-29-pictures-se...

Current build:

Computer case:
Cooler Master HAF X Full Tower

CPU:
Intel Core i5-2500K Sandy Bridge 3.3GHz


CPU Fan:
Cooler Master Hyper 212 Plus

GPU:
SLI EVGA GeForce GTX 560 Ti DS Superclocked 1GB

PSU:
Corsair Enthusiast Series 850-Watt 80 Plus Bronze Certified

RAM:
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600

HardDrive:
Samsung Desktop Class Spinpoint F3 1 TB SATA 3.0 Gb-s 32 MB Cache 3.5-Inch Internal Bare-OEM Drives, HD103SJ ($60)

Motherboard:
ASUS P8P67 PRO LGA 1155

Here are my idle temperatures at 3.3ghz:



Here are my temperatures without launching prime95, it's at 70C idle... What the heck? that's high.



I followed the quick 4.8 OC guide at http://hardforum.com/showthread.php?t=1578110

I set Vcore to 1.4

Multiplier at 48

LoadLine calibration at ultra high

VRM Fixed Frequency Mode at 350

Phase Control: Extreme

Duty Control: Extreme

C1E: Enabled

EPU: Disabled

And this is what I am getting running prime95 using the OCtuner in the UEFI(BIOS)

More about : 2500k

June 15, 2011 10:12:54 AM

1) Start at 1.38 and move up to 1.4 until you reach stability. I don't advise going up that far though, you're really pushing the chip there.

2)Essentially, what CPU-Z may report to be the voltage may not be what the CPU will be getting when running a demanding application or game. The best remedy is to keep MOSFET and choke area's well ventilated and cooled. Also, make sure you buy a good board if you're doing the over clock you're planning.

3)If possible, enable Load Line Calibration and C1E.

4)With a decent cooler (which you'll need) like the Prolimatech Armageddon, then between 30 and 40 celsuis idle and 60 to 70 celsuis full load.

5)Yes, perfect.
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June 15, 2011 2:05:15 PM

I run my i5 2500K at 5Ghz, and im shoving 1.5 volts into it. So far it's been as solid as a rock, and I've had it for about 5 months. V-Droop is when you set the CPU to run at, say, 1.45volts, but under load (Prime95 running for example) CPUz reports the CPU is only running at 1.41volts.
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June 15, 2011 4:44:41 PM

Griffolion said:
1) Start at 1.38 and move up to 1.4 until you reach stability. I don't advise going up that far though, you're really pushing the chip there.

2)Essentially, what CPU-Z may report to be the voltage may not be what the CPU will be getting when running a demanding application or game. The best remedy is to keep MOSFET and choke area's well ventilated and cooled. Also, make sure you buy a good board if you're doing the over clock you're planning.

3)If possible, enable Load Line Calibration and C1E.

4)With a decent cooler (which you'll need) like the Prolimatech Armageddon, then between 30 and 40 celsuis idle and 60 to 70 celsuis full load.

5)Yes, perfect.



1) So, set my vCore at 1.38 and attempt a 4.8ghz OC? How do I check for stability? Prime95? (How do I run stability test)

2)What is MOSFET? and what choke area are you talking about? I have a Asus P8P67 Pro and a Hyper 212+ as my CPU cooler.

3) What is Load LIne Calibration and C1E exactly do? I'll look in to it, but I also want to reconfirm here.

4) I have a Hyper 212 Plus, around 37-41 C idle.

5) Thanks =]

@RickyT23 I don't want to push the CPU too much, I don't want it to lose it's lifespan by pushing it past 1.4v which is what I read as the recommended max voltage to give CPU.

EDIT: I got 4.5ghz running stable at v1.3, what do you guys think? Never hits 70C

EDIT: I got 4.6ghz running stable at v1.325 never hits 70C
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June 29, 2011 6:41:29 PM

I got a couple questions myself.

1.Are you using a dual fan setup (push/pull) for the Hyper 212+?

2.How did you go about checking if it was stable? It seems like you found out how, would love to know the way though.

3.I'm personally wanting to OC to 4.5
I got pretty much the same setup (2600k, Asus Z68 mobo, Hyper 212+)
Besides changing the multiplier and the voltage, what else did you have to adjust?

Thanks
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June 29, 2011 9:26:10 PM

1. Yes I got 2 69.96 CFM fans push/pull on the hyper 212+

2. I used prime 95, run it for a couple hours and monitor temperatures and erros.

3. Voltage at 1.25 @ 45x multiplier

GOOD LUCK.
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June 29, 2011 10:12:16 PM

Alright.
Thanks.

Is that all you had to change though?
In some guides they refer to a couple other things.
(LLC, VRM frequency, etc)

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July 9, 2011 3:05:26 AM

I Pm'ed this off to RickyT23, but as I was writing it I thought it might be useful in general as it relates to the thread I think, I re edited it a bit so this might make more sense Ricky T.

Hey there,

Just on the vdroop thing... and CPU Z reporting.

I have my 2500k Fixed Volts set at 1.315, turbo over volt enabled and on my asrock extreme4 board am using level 4 setting to counter Vdroop. C states enabled and turbo enabled. Vdramm set to manual 1.5v, latencies set manually to CPU - Z SPD report, target best SPD; 666.8Mhz @9, 9, 9, 25, 1T

now it is running stable at 4600Mhz. (Aida64,Prime, OCCT,)

Thing is at idle, 1600Mhz, CPU -z (ver 1.57, 64bit latest) shows I am idling at 1.33v max (Range is 1.32 - 1.33). Core idle temps are 32, 32, 29, 33. Via Aida64 monitoring, confirmed with Real temp, and CPU-Z Hw Monitor.

Under load at 4600Mhz Cpu-Z reports vcore swinging between 1.289 and 1.308. with core temps in the low 50's. This is much lower than the values that were being reported to me when i just hit a 43 multiplier and left it up to the mobo to work it out for me (That way temps were up at 73 avge).

So my take is this:

I need the 1.33 to boot into windows at start up; this is supplied by either the Vdroop or overvolt setting; but after that even though there are 1.33 volts available the processor at 1600Mhz idle is only drawing the amps it needs to do its job. Therefore i get 1.33v * low amps =low watts/low work/ and therefore low heat.

I believe that at 4600mhz the chip draws the amps it needs to do the task put to it, and the voltage pipeline widens or narrows in accordance with the necessary amperage. Thus the lower and swinging Vcore figure under load. AND LOWER TEMPS AT A HIGHER CLOCK.

ANY THOUGHTS ON MY HYPOTHESIS; ANYONE; DOES THIS ONLY MAKE SENSE TO ME?


Kindest Regards
Lex

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July 13, 2011 4:27:19 PM

Edit: NM, I think you read the Guide before working the quick setup :p  My mistake.
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Best solution

July 18, 2011 12:59:14 AM

Unfortunately with overclocking, some chips just do far better than others. I was building a batch of computers for myself and some friends centred around i7-2600K chips, they all hit 4.5 GHz, one couldn't go beyond that, 3 capped out at 4.7-4.8 on air before getting unacceptably hot, but the one I've got in my system hit 5 GHz on under 1.4V, which is a value I don't want to pass. (1.4Vcore, 1.2QQTT, 75 degrees, and 1.65V RAM are figures that I personally don't want to pass. Other people have different values, and I admit that mine are, for the most part, quite conservative).

Moral of the story: it's entirely possible your chip can't hit 4.8, 4.5 is nothing to be ashamed of :D 

Also! I just noticed you put LLC up to max - on some boards that will provide a vcore HIGHER than what you've set in BIOS, so keep a very close eye on it with something like HWMonitor.
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July 18, 2011 7:41:37 PM

Best answer selected by newbie1992.
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