Am currently getting idle temperatures in the mid/high 40s and up to 62-65C during even moderate gaming (Sims 3, Starcraft 2). This was not happening until about a week ago, which I will explain below. System is a q9550 with a standard mid tower case, 2x80mm fans on the side (Thermaltake Smartfan, adjustable up to 70CFM apiece), 1x80mm each on the front (up to 50CFM, set at 35CFM) and back (35CFM). CPU fan is a Thermaltake Silent 775. Normally, it idles in the low 30s with the fans on low and gets up to the mid-40s in heavy gaming; highest temp I think I ever saw until this month was 51C, and that was on a hot day.
About a week and a half ago, one of my side fans stopped working entirely, which I figured out was because my manual fan controller on the front panel was damaged (the baby had gone up and twisted one of the knobs too hard and ruined it). I plugged that fan into a different port on the same controller, and both work fine now. However, at the same time, the CPU fan began constantly spinning at max RPMs no matter what the temperature was, making a hell of a lot of noise. The system would still idle in the high 30s or low 40s, but the CPU fan was intolerably loud and the motherboard had apparently forgotten how to adjust the speed according to temperature.. Tried Speedfan and a couple of other software fixes to control the CPU fan, but nothing -- it continued to spin. Eventually did some research on my motherboard (Asus P5E3 Pro) and found there was a BIOS setting called "Q-Fan" that lets you set the mobo's CPU fan control preferences. No help at all -- if Q-Fan is enabled, the CPU fan spins at the minimum 680-700 rpm no matter what, and the temperature skyrockets during gaming. Turning both side fans to max (for a total 140CFM and the noise level of a jet engine) does not help the temp by more than 1-2 degrees.
Last time I applied new thermal paste was less than a year ago. Last time I blew out the dust from the case was about a week ago. All the connections are solid. My fear is that the CPU fan control on the motherboard has crapped out and stopped working, or else the speed control element in the CPU fan itself is screwed up. One fix I have considered is getting a new front panel fan controller that can deal with the CPU fan ... but no guarantee that will work if the fan's control element is on the fritz. Otherwise, the options are replacing the CPU fan (a huge pain in the ass to do in my case) or replacing the motherboard. My first guess is that the mobo fan control is bonkers, not the fan's element, given that the fan can still run at more than one speed. I am not very happy about this, and if anyone has experienced a similar problem, I am all ears.
About a week and a half ago, one of my side fans stopped working entirely, which I figured out was because my manual fan controller on the front panel was damaged (the baby had gone up and twisted one of the knobs too hard and ruined it). I plugged that fan into a different port on the same controller, and both work fine now. However, at the same time, the CPU fan began constantly spinning at max RPMs no matter what the temperature was, making a hell of a lot of noise. The system would still idle in the high 30s or low 40s, but the CPU fan was intolerably loud and the motherboard had apparently forgotten how to adjust the speed according to temperature.. Tried Speedfan and a couple of other software fixes to control the CPU fan, but nothing -- it continued to spin. Eventually did some research on my motherboard (Asus P5E3 Pro) and found there was a BIOS setting called "Q-Fan" that lets you set the mobo's CPU fan control preferences. No help at all -- if Q-Fan is enabled, the CPU fan spins at the minimum 680-700 rpm no matter what, and the temperature skyrockets during gaming. Turning both side fans to max (for a total 140CFM and the noise level of a jet engine) does not help the temp by more than 1-2 degrees.
Last time I applied new thermal paste was less than a year ago. Last time I blew out the dust from the case was about a week ago. All the connections are solid. My fear is that the CPU fan control on the motherboard has crapped out and stopped working, or else the speed control element in the CPU fan itself is screwed up. One fix I have considered is getting a new front panel fan controller that can deal with the CPU fan ... but no guarantee that will work if the fan's control element is on the fritz. Otherwise, the options are replacing the CPU fan (a huge pain in the ass to do in my case) or replacing the motherboard. My first guess is that the mobo fan control is bonkers, not the fan's element, given that the fan can still run at more than one speed. I am not very happy about this, and if anyone has experienced a similar problem, I am all ears.