I've got a 3.25GHz Pentium D in my Intel D955XBK motherboard. I've had the system for a couple of years (home-built) and recently had a hard drive failure. System drive, naturally. After the rebuld I started looking into the cooling issues. My case is an older style full tower and has two 90 mm fans plus the power supply fan.
I now see that I have a processor temperature problem. The temperature normally hovers in the 60-68C range, but bumps to well over 70C, the recommended limit, frequently. So I went out and bought a new heat sink but the temperatures are the same. The only difference now is that the fan runs slower. It looks like the system is fighting my efforts to help it out and that it tries to keep the processor temperature at 60C.
Experimenting, I had the cover of the case off and I had a house fan blowing room air over the motherboard and the processor temperatures still haven't come down. The temperature in the case is at room temperature, which varies throughout the day between 25C and 32C. But at least this rules out the problem being a case ventilation or temperature problem. Case temperatures are supposed to stay below 38C. Processor temps did not improve.
I closed up the case closed again after installing two more 90 mm fans in it. I used a hole saw and mounted them in the side and they pull air in and blows it straight onto the part of the motherboard where the CPU is mounted. The other fan is mounted at the top to help the other case fan pull air out of the case. Room temperature is currently 25C, board temperatures are 44C and 35C, and the processor temperature is 60C. But, the processor fan is now running under 900 rpm! Why???? Is this CPU really supposed to maintain its temperature at 60C???? When I launch my browser the temperature shoots up to 70-71C before the fan comes up to around 1600 rpm, bringing the temperature back down to the low 60sC again. 70C is the operating maximum for this CPU.
I'm seriously thinking of cutting the 4th wire running to the processor fan. This is the PWM wire that controls the fan speed on 4-wire fans. With it cut the fan should run at full speed. I've got a 3-wire fan plugged into a 4-wire jack and that's what that fan is doing. Its running at around 3600 RPM. I'm fine with that.
Has anyone done this before?
Any why does my CPU fan run so slow?
Is there a way I can speed up the processor fan? I can't find a BIOS setting for this. The BIOS only lets me view the hardware sensor settings.
I now see that I have a processor temperature problem. The temperature normally hovers in the 60-68C range, but bumps to well over 70C, the recommended limit, frequently. So I went out and bought a new heat sink but the temperatures are the same. The only difference now is that the fan runs slower. It looks like the system is fighting my efforts to help it out and that it tries to keep the processor temperature at 60C.
Experimenting, I had the cover of the case off and I had a house fan blowing room air over the motherboard and the processor temperatures still haven't come down. The temperature in the case is at room temperature, which varies throughout the day between 25C and 32C. But at least this rules out the problem being a case ventilation or temperature problem. Case temperatures are supposed to stay below 38C. Processor temps did not improve.
I closed up the case closed again after installing two more 90 mm fans in it. I used a hole saw and mounted them in the side and they pull air in and blows it straight onto the part of the motherboard where the CPU is mounted. The other fan is mounted at the top to help the other case fan pull air out of the case. Room temperature is currently 25C, board temperatures are 44C and 35C, and the processor temperature is 60C. But, the processor fan is now running under 900 rpm! Why???? Is this CPU really supposed to maintain its temperature at 60C???? When I launch my browser the temperature shoots up to 70-71C before the fan comes up to around 1600 rpm, bringing the temperature back down to the low 60sC again. 70C is the operating maximum for this CPU.
I'm seriously thinking of cutting the 4th wire running to the processor fan. This is the PWM wire that controls the fan speed on 4-wire fans. With it cut the fan should run at full speed. I've got a 3-wire fan plugged into a 4-wire jack and that's what that fan is doing. Its running at around 3600 RPM. I'm fine with that.
Has anyone done this before?
Any why does my CPU fan run so slow?
Is there a way I can speed up the processor fan? I can't find a BIOS setting for this. The BIOS only lets me view the hardware sensor settings.