- Joined
- May 31, 2004
I used SpeedFan 4.11 to monitor my temperatures on my:
p4 [email protected] ghz, vc=1.60, p4p800, sp94 w/dual fan exhaust, pc3700.
(two front 80mm panaflos @ 3184 rpm)
Idle - - Full
23c . . 23c . . . room (measured at the back fan openings)
25c . . 25c . . . hard drive (80mm fan blowing on it)
28c . . 31c . . . cpu exhaust duct (dual fans blowing)
30c . . 30c . . . power supply exhaust
27c . . 28c . . . mobo
25c . . 36c . . . cpu
All those idle temps are pretty stable except the CPU which fairly rapidly fluctuates between 23c and 27c with about 60% of readings between 24c and 26c. What is the cause of these large fluctuations? Is it poor vcore regulation? Do others see the same kind of rapid changes with other mobos?
It also looks like my CPU temps are about 2-3c below the real value considering the mobo was 27c and the cpu 25c with room temp at 23c. How is the CPU calibrated and can you change the calibration?
I lowered my fan speed from 2970 to 2083 rpm about a 30% drop:
38c CPU (change = +2c)
29c mobo (change = +1c)
So dropping my fan speed significantly only resulted in a 2c increase in
CPU temperature. I dropped it again to 1654 rpm about a 45% drop.
39c CPU (change = +3c)
30c mobo (change = +2c)
It seems small changes in fan speed don't change the temperature that much.
So just for fun I turned the fan off with the CPU temp showing 39c.
30 seconds . . 44c
60 . . . . . . 50c
90 . . . . . . 56c
120 . . . . . 62c
150 . . . . . 68c
180 . . . . . 72c
Prime failed....so I restarted it and then turned the HS fan on full:
10 seconds 63c
20 s 57c
30 s 53c
40 s 49c
50 s 45c
60 s 43c
70 s 42c
80 s 40c
90 s 38c back to normal, prime stable.
That was some interesting fun. I was surprised how little difference the fan speed made....perhaps it means the sp-94 is very efficient on it's own...or my exhaust ducted dual fans still make a significant difference even at low speeds.
p4 [email protected] ghz, vc=1.60, p4p800, sp94 w/dual fan exhaust, pc3700.
(two front 80mm panaflos @ 3184 rpm)
Idle - - Full
23c . . 23c . . . room (measured at the back fan openings)
25c . . 25c . . . hard drive (80mm fan blowing on it)
28c . . 31c . . . cpu exhaust duct (dual fans blowing)
30c . . 30c . . . power supply exhaust
27c . . 28c . . . mobo
25c . . 36c . . . cpu
All those idle temps are pretty stable except the CPU which fairly rapidly fluctuates between 23c and 27c with about 60% of readings between 24c and 26c. What is the cause of these large fluctuations? Is it poor vcore regulation? Do others see the same kind of rapid changes with other mobos?
It also looks like my CPU temps are about 2-3c below the real value considering the mobo was 27c and the cpu 25c with room temp at 23c. How is the CPU calibrated and can you change the calibration?
I lowered my fan speed from 2970 to 2083 rpm about a 30% drop:
38c CPU (change = +2c)
29c mobo (change = +1c)
So dropping my fan speed significantly only resulted in a 2c increase in
CPU temperature. I dropped it again to 1654 rpm about a 45% drop.
39c CPU (change = +3c)
30c mobo (change = +2c)
It seems small changes in fan speed don't change the temperature that much.
So just for fun I turned the fan off with the CPU temp showing 39c.
30 seconds . . 44c
60 . . . . . . 50c
90 . . . . . . 56c
120 . . . . . 62c
150 . . . . . 68c
180 . . . . . 72c
Prime failed....so I restarted it and then turned the HS fan on full:
10 seconds 63c
20 s 57c
30 s 53c
40 s 49c
50 s 45c
60 s 43c
70 s 42c
80 s 40c
90 s 38c back to normal, prime stable.
That was some interesting fun. I was surprised how little difference the fan speed made....perhaps it means the sp-94 is very efficient on it's own...or my exhaust ducted dual fans still make a significant difference even at low speeds.
