High idle temps with H50

morpheus9394 · 21 Jun 2010 at 12:05

Hi All,
I have an i7 920 OC'ed to 4GHZ with a H50. The i7 was bought as part of a OC bundle from OCUK and has been rock solid.
Yesterday I was encored some movies, something that I do all the time, and the PC blue screened for the first time ever.
I put it down as a one off ever and tried again but this time the machine hung after 20mins.
That's when I checked my temps. Two of the cores are idling around 49-52c and the other two are around 44-47c.
As soon as I run Prime95 the temps jump up to 90c also instantly and two of the cores hit 99c within 5mins, before I stop the test.
Nothing has changed in my machine, airflow is very good.
I have the two standard corsair fans, one blowing air into the motherboard area and one blowing onto the hard drives.
I have three enermax flows at the top of the case set to exhaust.
I have another enermax high CFM fan set as an intake on the rad.
I am just worried that the H50 is failing somehow which explains why it is not cooling the CPU properly but I would appreciate any advice for you guys.
I was thinking of change the fan on the H50 to exhaust instead as my 5870 exhausts into the case and also I have 4 hard drives which may be adding heat to the case.
I am just concerned at the sudden increase in my temps as I have not change anything on the machine for 3months or so and it has always been very stable.

Serenityxo · 21 Jun 2010 at 12:09

Might be a obvious question but are you sure you have the pump plugged into a 12v header? If not it'll run slower and affect performance.

Download this and look at "AUXFANIN0" it should be called and make sure its @ 1400rpm or there about, if not then the pump isn't getting enough juice.

Also the Corsair fans that come with the H50 ain't much good, especially on an i7 @ 4GHz doesn't seem to be the ideal setup, sounds like it isn't getting enough airflow to cool it (if the pump is in the correct header)

morpheus9394 · 21 Jun 2010 at 12:37

Thanks for the reply mate.
The pump is connected to CPU FAN2 on the my motherboard, which is 12v but I will confirm the speed tonight when I get home tonight.
I am not using the corsair fan that come with the RAD, I swapped that for a Enermax magma fan, which is a high CFM, low noise fan and that has been working great.
I have ordered another Magma fan and will add it to the H50 in push/pull and set the fans to exhaust to hopefully improve the temps.
I will also remove the thermal paste that came with the H50 and apply some artic silver instead. If that doesn't make a difference then it may point to a faulty pump.

Boozebeard · 21 Jun 2010 at 12:46

Normally the cpu fan header will regulate speed based on the temprature of the cpu so you wont be getting constant 12 volts. It should be attached to a system fan header.

morpheus9394 · 21 Jun 2010 at 13:35

Boozebeard said:
Normally the cpu fan header will regulate speed based on the temprature of the cpu so you wont be getting constant 12 volts. It should be attached to a system fan header.

Actually I just checked my manual and I have connected the pump to the CHA_FAN not the CPU_FAN so that should be fine.
The fan for the RAD is connected to my fan controller but it set to max speed.