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Cooling an i7-3770K with an Antec Khuler 920, temps seem way off.

post #1 of 10
Thread Starter 
I've been watching my temps and they seem not at all better than a stock cooler. Under idle, my temps sit at 29/28/30/28 but the CPU is downclocked to 1.6Ghz when not loaded.

On bios defaults I get these temps after running Prime 95 small FFT. Turbo and speedstep enabled, C states on. 3.9GHz.




Seems safe but much higher than people report with this cooler


Now when I use ASUS auto tuning (I have a P8Z77-WS board) I can achieve an overclock to 4.326MHz (103x42 with a VCore of 1.275. DDR voltage is 1.65 which is what my RAM is rated at). My temps go through the room, pushing the TJMax of this chip.





I feel like something is either wrong with this cooler or its just too weak for what I'm overclocking at. I tried reseating the cooler with new arctic silver with better results. I'm currently looking into building a water cooling setup for my SLI'd GTX 580s, would it be worth it to include a water block for the CPU in the loop? I know my info is sparse, I just dont know what info you guys would need to help so please ask and I will post the requested specs ASAP. Thanks!
Edited by devsfan1830 - 3/3/13 at 12:06pm
post #2 of 10
Okay for start well done for the upside down photos wink.gif

Second never use "auto tune" it over volts the hell out of your chip.

It seems that your CPU has some sort of "cool'n'quiet" enabled so that it throttles your chip to reduce temps (its called cool'n'quiet on amd not sure for intel.

theres plenty of guides on overclocking manually on this forum, try refer to those and you will see your temperatures drop.

All failing that is your unit fully functional? Is the pump operational? are the fans set up right?
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post #3 of 10
Thread Starter 
Quote:
Originally Posted by wthenshaw View Post

Okay for start well done for the upside down photos wink.gif

Second never use "auto tune" it over volts the hell out of your chip.

It seems that your CPU has some sort of "cool'n'quiet" enabled so that it throttles your chip to reduce temps (its called cool'n'quiet on amd not sure for intel.

theres plenty of guides on overclocking manually on this forum, try refer to those and you will see your temperatures drop.

All failing that is your unit fully functional? Is the pump operational? are the fans set up right?

Yeah I saw those, I was fixing them while you replied. Sorry bout that.

The unit appears fully functional, it has desktop software that monitors temp automatically ramps the pump and fans accordingly based on coolant temps. When it hit 100C the coolant was at 46 and they both stayed fairly low RPMs, great for noise bad for temps i guess. Fans are in a push/pull as an exhaust out the back of my case. I have three 120mm fans feeding fresh air into the front, over the board and right at the cpu cooler:

Ill try manual overclock since you said the voltage is way too high, that might be part of the problem. With all this airflow and the waterblock I feel like something else is up or this cooler is just too basic.
post #4 of 10
the cooler should still perform way better. put your rad fans on full speed, and MOST CERTAINLY do a manual overclock with a lot less volts
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post #5 of 10
Thread Starter 
So after finding a guide a few threads down for overclocking an ASUS mobo/3770K combo (really should have read that first tongue.gif) I am currently using Prime95 blend test to stress test a manual OC to 4.2GHz (100x42 @ 1.2V vCore) Temps on the cores top off at 70-75 at full load, ocasionally a core would approach 80 but come back down. The autotuner put my Vcore around the same but used both the bclk and the multiplier to set my overclock. Seems like using the multiplier only is keeping the heat down. I still need to let this run a little while longer before I try bumping the multiplier up a notch. But so far so good. If anyone has any other suggestions as far as the main numbers i need to tinker with to lock this thing in would be much appreciated.

As to my cooler, setting the fan at flat out max is not desireable. This damn thing is loud. However, i set the software to custom and it seems to be ramping the fan better. I thought "silent" had a fan curve but it turns out it just limits the fan to a set low speed. Custom results in a ramp up of the fans with a barely noticeable noise increase.
Edited by devsfan1830 - 3/3/13 at 2:37pm
post #6 of 10
I heard the stock fans suck on those Antec CLCs, so you may want to try picking up different fans, maybe some Corsair SP120 fans, anything with high static pressure.
Once you reach your desired overclock, run plenty of stress testing, and try bring down your voltage.

Remember, Less volts = Less heat.

75 on an i7 still seems a bit high, so maybe new fans and less volts are your solutions here.
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post #7 of 10
I have the Antec Khuler 620 Its the smaller model and not the push pull. I had replaced the fan with a cooler master silent fan before ever putting it in my system. I have my i7-3770k with a 4.5 OC @1.255v and after a 24 hour prime 95 stability test max temps where 73 72 78 72.

I have 2 140 mm in the front one on the 620 and a 200 mm on the top.

A few things to check.

Make sure you have a good airflow. IE you said you have 3 fans in the front blowing in and you are exhausting over your cooler. I would swap that around having the push pull sucking air into the case so cool air sucked in over your radiator rather then sending the heat from your SLI over your coils trying to cool your cpu.

Make sure your 920 is plugged into the cpu fan spot so it ramps up as the cpu demands even at "silent" the CPU should not heat up that high with out the fan ramping up. Not sure what MB you have but on my ASUS Sabertooth Z77 What I did was I set my intake fan (the Khuler) attaching that to the CPU fan and one of my 3 exhaust fans to the CPU_Opt connection, that way as the CPU heats up I have effectively a push pull setup. The intake on the Khuler ramps up and one of the case fan ramps up at the same time. The other 2 case fans are on case fan plug ins so they ramp up as the unit gets warm, I have yet to hear them ramp up.
Edited by jini - 3/4/13 at 6:08am
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by jini View Post

I have the Antec Khuler 620 Its the smaller model and not the push pull. I had replaced the fan with a cooler master silent fan before ever putting it in my system. I have my i7-3770k with a 4.5 OC @1.255v and after a 24 hour prime 95 stability test max temps where 73 72 78 72.

I have 2 140 mm in the front one on the 620 and a 200 mm on the top.

A few things to check.

Make sure you have a good airflow. IE you said you have 3 fans in the front blowing in and you are exhausting over your cooler. I would swap that around having the push pull sucking air into the case so cool air sucked in over your radiator rather then sending the heat from your SLI over your coils trying to cool your cpu.

Make sure your 920 is plugged into the cpu fan spot so it ramps up as the cpu demands even at "silent" the CPU should not heat up that high with out the fan ramping up. Not sure what MB you have but on my ASUS Sabertooth Z77 What I did was I set my intake fan (the Khuler) attaching that to the CPU fan and one of my 3 exhaust fans to the CPU_Opt connection, that way as the CPU heats up I have effectively a push pull setup. The intake on the Khuler ramps up and one of the case fan ramps up at the same time. The other 2 case fans are on case fan plug ins so they ramp up as the unit gets warm, I have yet to hear them ramp up.

It should have noted earlier I don't exactly have your standard PC case.






The front 3 are 120mm intake, the Khuler is Push?pull exhaust, there are 2 more 120mm fans under the mobo plate behind the HDDS exhausting air out over them. I have been also looking at watercooling my GPUS, which presents a dillema. Id need to place a 3 fan radiator in the front fans, I'd use those as intake to pull cold outside air in over the rad. This heat would then end up going over the CPU rad and out, killing its performance. If I were to flip that fan direction, I'd solve that. But I'm not sure relying on the two bottom fans to pull all that heat out would work well.

Right now i'm stress testing a 4.4GHz overclock, temps still at 79/84/80/79 with a vcore of 1.23. Gonna try n bring it down but it sounds like its in the ballpark of yours. Might just need to fix the airflow issue. I feel like my best bet, if i go with GPU cooling is to include the CPU in the new loop, ditch the Khuler. And run the front fans/rad as intake and put an exhaust fan where the current cooler is. Cold air in front, hot out the back.
post #9 of 10
I seen that from your pic, my case is similar,

While these pictures are not my PC, its the same case:







I have all my case fans blowing in except the top fan that blows out, this keeps cooler air blowing on all my components with the hot air being sucked out of the top of the case.

*edit*

The point is that I would want cool air coming into my CPU cooler, You are currently blowing all the hot air though your cooling system, that cant help be helping to keep it cool. Looping it in with the GPU coolers may help, But I am not really sure you will need GPU coolers unless you plan on extreme OC of the 680's they do well enough on air. I OC'ed my 670 and its never broke 62c on air. EVGA does a good job with their cooling on the video cards.
Edited by jini - 3/4/13 at 10:54am
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ADATA XPG SX900 256 GB Western Digital WD VelociRaptor WD6000HLHX LG Electronics Blu-Ray Burner Rewriter WH14NS40 Antec Kuhler H2O 620 Liquid CPU Cooler System 
OSPowerCase
Windows 7 ultimate Corsair Enthusiast Series 850-Watt  Cooler Master HAF XB - LAN Box and Test Bench ... 
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i7 990x asus p6t deluxe v2 Nvidia GTX 580 revo 
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post #10 of 10
Thread Starter 
Quote:
Originally Posted by jini View Post

The point is that I would want cool air coming into my CPU cooler, You are currently blowing all the hot air though your cooling system, that cant help be helping to keep it cool. Looping it in with the GPU coolers may help, But I am not really sure you will need GPU coolers unless you plan on extreme OC of the 680's they do well enough on air. I OC'ed my 670 and its never broke 62c on air. EVGA does a good job with their cooling on the video cards.


Thanks to all who assisted me here. I tried reversing the airflow of the Antec Khuler. While it resulted in slightly lower idle temps, the temps rocket up way to fast for my liking. I've reverted to stock clocks for now and am now building a new water cooling loop to include the CPU and both GPUs. To your point about EVGA cooling, I dont have 600 series cards I have two 580s.Still I agree, they do a great job of keeping cool even under minor overclock, but the fan is unbearably loud as it ramps up. Those fans plus the already somewhat loud 6 120mm fans I have gets distracting.

I already ordered water blocks for the GPUs but I've started a new thread here for the rest of it:

http://www.overclock.net/t/1367599/new-to-diy-water-cooling-need-parts-pump-res-suggestion

If anyone is skilled in water cooling I would appreciate a review of my remaining parts, particularly the pump and res. I need something quiet yet powerful enough to run the loop. I hope to gain an appreciable gain from the Khuler. I really think something is off with it. The 3770 runs hotter than SB chips, but it shouldnt be THAT bad. Reviews of the Khuler have it perfroming way better with similar setups.
Edited by devsfan1830 - 3/4/13 at 5:35pm
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