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Strange Power Supply Issue
I have a 500W power supply that has run stably with a 2.8GHz Pentium 4
CPU on a ASUS P4C800 Deluxe mobo over the past 6 months. The other day I was given a 3GHz Pentium 4 CPU. I swapped out the old CPU and fan and installed the brand new boxed CPU and fan. However ever since I have made the swap over, the fan in the power supply has been working about twice as hard as it did when the 2.8GHz cpu was installed. It is now twice as loud as it was before and the extra noise is quite annoying. Has anyone else ever experienced this problem? What could possibly make the fan of a power supply work harder like that. Surely the extra power to run a measly 0.2GHz of extra CPU clock speed in a CPU is not enough to cause this effect in a 500W power supply? Another annoying new feature since the CPU swapover is random power supply shutdowns. Sometimes when I am making the system work hard, the system suddenly does down. It is like someone has come along and pulled the plug out of the wall socket. I am suspicious that perhaps the new heatsink and fan assembly is not making proper contact with the top of the CPU resulting in inefficient heat transfer, and an overheating CPU. I checked with the ASUS website and noticed some circuitry that appears in several of their boards called ASUS C.O.P (CPU Overheating Protection). However this technology is not listed as being part of the ASUS P4C800 Deluxe. Can anyone confirm if it is actually there or not? I shall take the cover off the case tomorrow when I am not so tired and make sure I haven't done something bonehead like connecting the CPU fan power supply to the case fan supply by mistake. I was always under the impression that power supply fans were not variable speed. |
#2
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In article , Todd Martin
wrote: I have a 500W power supply that has run stably with a 2.8GHz Pentium 4 CPU on a ASUS P4C800 Deluxe mobo over the past 6 months. The other day I was given a 3GHz Pentium 4 CPU. I swapped out the old CPU and fan and installed the brand new boxed CPU and fan. However ever since I have made the swap over, the fan in the power supply has been working about twice as hard as it did when the 2.8GHz cpu was installed. It is now twice as loud as it was before and the extra noise is quite annoying. Has anyone else ever experienced this problem? What could possibly make the fan of a power supply work harder like that. Surely the extra power to run a measly 0.2GHz of extra CPU clock speed in a CPU is not enough to cause this effect in a 500W power supply? Another annoying new feature since the CPU swapover is random power supply shutdowns. Sometimes when I am making the system work hard, the system suddenly does down. It is like someone has come along and pulled the plug out of the wall socket. I am suspicious that perhaps the new heatsink and fan assembly is not making proper contact with the top of the CPU resulting in inefficient heat transfer, and an overheating CPU. I checked with the ASUS website and noticed some circuitry that appears in several of their boards called ASUS C.O.P (CPU Overheating Protection). However this technology is not listed as being part of the ASUS P4C800 Deluxe. Can anyone confirm if it is actually there or not? I shall take the cover off the case tomorrow when I am not so tired and make sure I haven't done something bonehead like connecting the CPU fan power supply to the case fan supply by mistake. I was always under the impression that power supply fans were not variable speed. Northwood 2.8GHz/FSB800 (0.13u 512KB cache) 69.7 watts http://processorfinder.intel.com/scr...sp?sSpec=SL6WT Prescott 3.0e/FSB800 (90nm 1MB cache) 89 watts http://processorfinder.intel.com/scr...sp?sSpec=SL7E4 Now, 20 more watts shouldn't make a difference to the PSU. But the fan on the processor could be spinning faster than the fan on the old one. Intel P4 fans are controlled by the air temp passing through the fan, so a higher case temperature will make them speed up. Many PSU fans are also variable speed. They are thermally controlled in some manner. Generally the PSU fan spins too slow for its own good. Asus COP (CPU Overhead Protection) is something added to Athlon boards, because Athlons had no burnout protection. Asus uses a Winbond chip or an Attansic chip, to sense the diode temperature inside the CPU. These chips have a shutdown signal, for when the CPU gets too warm. Since Asus had to add a chip, and a small additional expense to each board, they apply their marketing term (COP) to the adverts. In the case of your new Pentium chip, there are two levels of protection. There is thermal throttling, where the CPU does less computing, if it gets too warm. This cuts in at maybe 70C. A second level of protection is a 135C or so, and at that level, the processor uses a shutdown signal to stop the thermal problem. Since these features are part of the processor, they don't need an Asus marketing term applied to them. You could check the hardware monitor in the BIOS, to see what temperatures are listed for stuff. Or use MBM5 or Asus Probe, to check temperatures while running Windows. I have a 2.8GHz Northwood, and sitting idle in Windows, it draws maybe 13 watts or so (measured via ammeter on the 2x2 ATX12V connector). I expect your Prescott will have a higher idle power draw than that. In any case, if it really is the PSU fan you are hearing and not the CPU fan, better have a look around. The shutdown could be the PSU itself shutting down on overheat. Feel the case of the PSU, feel the air exhausted from it, to determine whether the PSU is under stress. Otherwise, I think you are on the right trail. Either the CPU isn't seated right, or something is shorting in the case. You could try the "cardboard test", running the motherboard outside the case, to see if the problem stops. Without other equipment, it is pretty hard to figure out where the extra power is going, or if there really is a lot of extra power being drawn. A long time ago, there was a problem with the P4C800 deluxe - see the post by Mechabouncer in this thread. This only applies to the first few thousand boards. The solder short is somewhere around the plastic stiffener for the CPU, on the underside of the board. The picture is with the plastic part removed, showing how the hot solder got distorted enough to touch an adjacent solder joint. http://www.techsupportforums.com/sho...=&postid=41955 http://web.archive.org/web/200402272...i/DSC00249.JPG HTH, Paul |
#3
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You made NO MENTION of which version of the 3.0 GHz processor you wer given
and installed. If it's a Prescott version then you can expect the power supply to work considerably harder. The Prescott CPU puts out about 30% more wasted heat than the older Northwood version. And as the case heats up inside, power supply units put out LESS available wattage. They are operating temperature dependent. -- DaveW "Todd Martin" wrote in message ... I have a 500W power supply that has run stably with a 2.8GHz Pentium 4 CPU on a ASUS P4C800 Deluxe mobo over the past 6 months. The other day I was given a 3GHz Pentium 4 CPU. I swapped out the old CPU and fan and installed the brand new boxed CPU and fan. However ever since I have made the swap over, the fan in the power supply has been working about twice as hard as it did when the 2.8GHz cpu was installed. It is now twice as loud as it was before and the extra noise is quite annoying. Has anyone else ever experienced this problem? What could possibly make the fan of a power supply work harder like that. Surely the extra power to run a measly 0.2GHz of extra CPU clock speed in a CPU is not enough to cause this effect in a 500W power supply? Another annoying new feature since the CPU swapover is random power supply shutdowns. Sometimes when I am making the system work hard, the system suddenly does down. It is like someone has come along and pulled the plug out of the wall socket. I am suspicious that perhaps the new heatsink and fan assembly is not making proper contact with the top of the CPU resulting in inefficient heat transfer, and an overheating CPU. I checked with the ASUS website and noticed some circuitry that appears in several of their boards called ASUS C.O.P (CPU Overheating Protection). However this technology is not listed as being part of the ASUS P4C800 Deluxe. Can anyone confirm if it is actually there or not? I shall take the cover off the case tomorrow when I am not so tired and make sure I haven't done something bonehead like connecting the CPU fan power supply to the case fan supply by mistake. I was always under the impression that power supply fans were not variable speed. |
#4
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Paul
Thankyou for taking the time to post such a detailed and informative reply. You have given me plenty of information to try and track down the problem. I really appreciate that. Thanks |
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