High temperatures for closed loop water cooling

[ruhtraeel]

Hello,
I have an i5 2500k with an Antec Kuhler H2O 620. I used to have a Gigabyte Z68X-UD3H-B3, and the CPU ran at around 37 degrees idle. However, now, I have a BIOSTAR TZ77XE3, and the i5 2500k is overclocked to 4.0ghz. However, I'm getting 55-65 degrees idle, and as hot as 80 degrees under load.

What exactly is going wrong? I've tried reapplying thermal paste. Also, the bracket at the back that is stuck to my motherboard has one side of it pushed against the ends of capacitors, but the bracket seems to be contacting the motherboard just fine.

Thanks

 

[Idontcare]

你好 ruhtraeel, I would suggest you investigate the Vcc of your CPU, it probably is too high at 4GHz and that is resulting in your observation of high temperatures.

 

[Prey2big]

Cooler properly seated? Fan speeds? TIM? Pump speeds?

The pump should not be automatically controlled. They need 12V.

 

[ruhtraeel]

你好 ruhtraeel, I would suggest you investigate the Vcc of your CPU, it probably is too high at 4GHz and that is resulting in your observation of high temperatures.

Cooler properly seated? Fan speeds? TIM? Pump speeds?

The pump should not be automatically controlled. They need 12V.

Hello,
I reverted to stock speeds, stuck the default cooler back on, changes the cpu vcore mode to "offset" and now I get around 40-50 degrees idle.

Could it be because my old motherboard made the CPU use less voltage? I remember that it used to not go over 60 degrees load, either. At stock clocks, the CPU fluctuates between 1.07v and 1.27v according to hwmonitor .

I changed the starting fan speed on the radiator to 60 percent, but it still gave me high temperatures.

Ambient temperatures are around 16 to 18 degrees Celsius.

 

[artvscommerce]

Cooler properly seated? Fan speeds? TIM? Pump speeds?

The pump should not be automatically controlled. They need 12V.

Do you have the pump/waterblock connected directly to the motherboard with the 3-pin connector or is it connected to a molex adapter that goes into the power supply?

 

[ruhtraeel]

Do you have the pump/waterblock connected directly to the motherboard with the 3-pin connector or is it connected to a molex adapter that goes into the power supply?

Hello,
It was directly connected to the 3 pin on the motherboard. Do the fan headers on the motherboard not give out 12V?

I'm really curious now, do different motherboards set the CPU at different voltages?

When I get home, I'll try putting the H2O cooler back on, and then set the offset to run at around 0.95 idle and 1.2 MAXIMUM at load, and see if I can reach 4.0ghz.

Would anyone be able to give me a decent Voltage/BIOS config that runs with minimum voltage?

 

[artvscommerce]

Hello,
It was directly connected to the 3 pin on the motherboard. Do the fan headers on the motherboard not give out 12V?

I'm really curious now, do different motherboards set the CPU at different voltages?

When I get home, I'll try putting the H2O cooler back on, and then set the offset to run at around 0.95 idle and 1.2 MAXIMUM at load, and see if I can reach 4.0ghz.

Would anyone be able to give me a decent Voltage/BIOS config that runs with minimum voltage?

The pump/waterblock should not be connected directly to the motherboard. The 3pin header on the board will change the output voltage based on temperatures. These headers were meant to control the RPM of the chassis fans by changing the voltage. The pump on closed loop watercoolers are designed to run @ 12v all the time.

If you're using the voltage offset I would imagine there would be a variance in the voltages from board to board.

I don't have a BIOS config for you but 1.2v is not very high. You shouldn't have temperature issues @ that voltage.

 

[ruhtraeel]

The pump/waterblock should not be connected directly to the motherboard. The 3pin header on the board will change the output voltage based on temperatures. These headers were meant to control the RPM of the chassis fans by changing the voltage. The pump on closed loop watercoolers are designed to run @ 12v all the time.

If you're using the voltage offset I would imagine there would be a variance in the voltages from board to board.

I don't have a BIOS config for you but 1.2v is not very high. You shouldn't have temperature issues @ that voltage.

Ohh, I see what you're saying now. I'll try connecting the pump directly to the PSU then (assuming I have the right connector?). It also seemed suspicious because when I felt the water block, it felt quite hot, but the radiator felt completely cool.

And yeah, it seems suspicious for the CPU to be running that hot even at 1.2xV.

Although I'm still curious as to why the stock cooler still runs at 40-50 degrees idle (at 1.07-1.27v)


EDIT: I have a fan controller at home; maybe I'll try routing the pump's 3-pin through the fan controller and turning the fan controller all the way up so it feeds 12V constantly. I just really hope that the pump isn't broken or anything, and that it was just running really low which made the CPU block hot but the radiator cold.

 

[ruhtraeel]

Hey, so I hooked up the pump 3 pin to a fan controller and set it to run at full speed. However, I still get around 50 degrees idle, and 80+ when running Prime95.

I even set the voltage offset to -0.1V.

After putting my liquid cooler back in, I think it ran hotter than the stock cooler.

At this point, I really don't know why my cpu is running so hot. The block is warm to the touch, as well as one of the tubes, but the radiator itself is cold. I can see that the pump speed is around 1400RPM in the BIOS.

Does this mean my pump is broken?

Thanks


EDIT: I'm almost 100% sure that my pump is broken now. When I run Prime95 and the CPU gets to 80+ degrees, the radiator is still cold.

 

[artvscommerce]

Are you re-applying the thermal compound on the waterblock each time you remount? How much are you using?

 

[ruhtraeel]

Are you re-applying the thermal compound on the waterblock each time you remount? How much are you using?

Admittedly, I think I used slightly too much the last time I put it on. However, the general consensus seems to be that if one of the tubes is hot and one of the tubes is cold, and the radiator is cold regardless of how hot the block is, the pump is not cycling liquid through the entire loop.

I have been reading this guy's experiences:
http://www.tomshardware.com/answers/id-2009409/antec-kuhler-h2o-920-3770k-high-temps.html


Seeing as how the shipping cost for RMAing it would be around $40, I'll probably just get a Zalman LQ-310 or something.

 

[ruhtraeel]

Sorry for the double post, but I got the Zalman LQ-310 and currently at stock speeds, my CPU is running at 29-30 degrees at idle. I'll be RMAing the Antec one shortly.

Thanks everyone
谢谢你们