• We’re currently investigating an issue related to the forum theme and styling that is impacting page layout and visual formatting. The problem has been identified, and we are actively working on a resolution. There is no impact to user data or functionality, this is strictly a front-end display issue. We’ll post an update once the fix has been deployed. Thanks for your patience while we get this sorted.

Couple of Ivy Bridge OC questions

Essence_of_War

Essence_of_War

Platinum Member
Hey folks,

I got a kill-a-watt for christmas, and I decided to toy around with actually OC'ing my CPU and taking some associated power draw measurements! :awe:

Here's where I'm at right now (rig is in sig):
offset voltage at +.005V
turbo boost voltage at +.004V
all core multiplier: 43
CPU LLC: @ 50%.

prime95 blend for 10min is getting me core temps of ~89C on one of my cores, and CPU-Z reports Vcore of 1.200V.
IBT for 20 passes is getting me to ~87/88 on 2-3 cores and Vcore of 1.200V.
POV Ray benchmark is getting one core to around 78C and CPU-Z reports Vcore of 1.192V.

At idle, multiplier is 16, temps are ~30C, Vcore ~.944V

My understanding is that optimal temp for IvyB is < 90C, and although I haven't encountered any instability yet, if I'm already bumping up against 90C under prime95/IBT loads, I'm guessing that I don't have much more headroom to either turn up the voltages to stabilize if I did need it for a higher multiplier, right?
 
89*C is high for any CPU so I'd say you're very close to the limit. I would never have a CPU running at temps higher than mid 70s.
 
Try turning down LLC from 50% to 25% or even 0%. You often don't need it for a moderate OC of 4.3GHz near stock voltage. Retest stability under load afterwards.

And what CPU cooler are you using? I have a Coolermaster 212 EVO and my i5-3570 OC'd to 4.2Ghz doesn't even hit 60c under several hours of Prime with all 4 threads loaded. Video encoding is nearer 55c and gaming is nearer 50c. 89c is a bit too hot for long term usage. Personally, I wouldn't feel happy with any system component going over 70c. If you're using the stock cooler, be aware that upgrading to even relatively budget after-market coolers can knock off 15-30c load temps.
 
Yes based on the conditions you are describing you probably have very little OC headroom left in your current configuration. If you want to increase you'll need to improve your cooling system.

The CM 212 is a decent low budget cooling tower but I've found it to be very limiting with higher OCs. Of course the most bang for your buck will be delidding your CPU. That will knock 15-20C off your temps if done properly.
 
GreenChile said:
Yes based on the conditions you are describing you probably have very little OC headroom left in your current configuration. If you want to increase you'll need to improve your cooling system.

The CM 212 is a decent low budget cooling tower but I've found it to be very limiting with higher OCs. Of course the most bang for your buck will be delidding your CPU. That will knock 15-20C off your temps if done properly.
Click to expand...

If the 212 is just a good low-budget one, what's the price range on something better?. I'm considering grabbing a 3570K or 4670K from Micro Center, and I'll probably pair it with an aftermarket air cooler, in case I want to OC it at some point.

The delidding had my dad really intrigued when he first heard about it, and he said he'd maybe get an Ivy Bridge CPU and do it, but he never followed through with it. I wouldn't trust myself to do it, though.
 
Quick update:

44x was also stable with nearly identical temps as 43x.
45x booted into windows, but no benchmarking/stress testing applications were stable, even with Turbo Voltages up to +.016V, and got unacceptably hot before they crashed.

So I guess that answers my questions. That looks like all of the headroom I have, I think I'll walk it back to 43x/42x for day-to-day use. I might try to bench a little at 4.4 first though 😛.

Edit: I'm using the Evo also. I'm not really trying to get a vicious OC, I'm just tinkering around and trying not to leave excess gaming performance on the table, so I have no plans to upgrade the cooler or anything.
 
Lil Frier said:
If the 212 is just a good low-budget one, what's the price range on something better?. I'm considering grabbing a 3570K or 4670K from Micro Center, and I'll probably pair it with an aftermarket air cooler, in case I want to OC it at some point.

The delidding had my dad really intrigued when he first heard about it, and he said he'd maybe get an Ivy Bridge CPU and do it, but he never followed through with it. I wouldn't trust myself to do it, though.
Click to expand...

http://www.newegg.com/Product/Produc...82E16835608018
or one of the best in CL water cooling...
http://www.newegg.com/Product/Produc...82E16835146028
 
First, I to have simular HW , up to 4.2 you don't need any more voltage than stock , so thats around 1.12 v depending on chip . That get you around low 60'sc in prime95 .

For 4.3 try something like 1.14v , If you want try XTU so you can tweak in windows and then transfer good results to bios . Maybe 4.4 can be had little lower like 1.18 .

For 4.5 you probably would need 1.25-1.28v around that range judging by your 4.4 results .

Make sure you make a fan profile for evo as stock is little low , I have mine set so its like at 1000rpm at idle and goes up to 75% (1500rpm) under max loads .

If you case can fit Noctua NH14S is great HS with good ram clearance and good performance , as long as you have clearance on first slot down on MB .

For 24/7 I would just set it to 4.2 with default voltage and be done with it , 100mhz here or there is not going to be showstopper .
 
Last edited:
First, I to have simular HW , up to 4.2 you don't need any more voltage than stock , so thats around 1.12 v depending on chip . That get you around low 60'sc in prime95 .
Click to expand...

So by stock, you mean just setting the offset and turbo voltages to "auto", right?
 
I'm mining on my i5 3570k @ 4.25GHz 24/7 and even with the voltage around 1.244 my temps were in the low 50s and that's with two 7870s going full blast mining away on their own and blowing all the hot air into the case. Not sure if my motherboard sensors are off, but that seems awfully cool considering I am running a budget cooler Zalman Optima with only 1x120mm fan.

I will turn down the voltage to 1.18v on next restart and see what happens.
 
What thermal paste are you using? When was it applied? What does your fan profile look like?

Seems a little hot for your setup. I would expect more like 70-80 at full load with that OC. Something isn't right.
 
Thermal Paste is AS5, applied about 10 months ago when I built this.

Let me look into the fan profile.

Edit: fan profile was set to full on (~1800 rpm).
 
Last edited:
Essence_of_War said:
So by stock, you mean just setting the offset and turbo voltages to "auto", right?
Click to expand...
well , yes if your voltage is around 1.12 range , I am on Asus P8Z77v pro and for 4.2 all I need to do is set multipier to 4.2x .
For you that might work or maybe need no LLC or one step up with offset so it = target vcore of 1.12 ( I am saying this voltage as example you can find good low voltage , whatever stock freg is at load should be fine for 4.2) .
 
Essence_of_War said:
Thermal Paste is AS5, applied about 10 months ago when I built this.

Let me look into the fan profile.

Edit: fan profile was set to full on (~1800 rpm).
Click to expand...

Yes but is it reaching 1800 at full load , what temp is needed for 1800 ?
with Asus MB the fan doesn't react to core temps but MB CPU socket temps so its a different scale .
I use AS5 to
 
You must log in or register to reply here.

TRENDING THREADS

Back
Top