just upgraded wish i didnt.... 1

[p0p]

i just put a new copper heatsink on my aunts P3, and a new 430 watt antec PSU, and they seem to have fried my board...the PSU fan barely moves, and the cpu fan doesnt, i pu the PSU in anouther comp. and it ran it fine, its just this one. i tryed the heatsink fan elsewhere also and it ran. i dont know what to do. the comp worked fine (slowly but fine) before i touched it. so what do you think bad motherboard???

anyhelp is much appreciated
,
p0p

 

[BadBigBen]

POP at first I thought you understood, then you again misconcepted it... they all run at the same voltage (main peripherials at 12v and 5v) but some draw more wattage than others... like you said consider the wattage a pool, all animals draw from that pool and are happy, then comes along a new animal that for somereason needs more water (wattage) than the others, and voila, the pool is not enough for all animals anymore(too much draw at one time)... but still the animals putter along at the same rate to that pool (voltage)

have fun... it's been for me...

Ben

PS - don't fret we all do on more than one time in our lifes... I know I do...

 

[ceh4702]

430 watts is overkill for most PIII system. Under most conditions 350 watts is enough for most computers. This is only if you have a powerful video card and sound card that both pull lots of watts. I think if you look at the power consumption, the PIII processors pulls a lot less watts than a P4. 350 watts is enough for some PIII systems.

On the power supply you have to look at the wattage avaliable on all the Rails that supply the separate voltage levels, and then you add them up to get to the total wattage rating of the power supply; which typically is +/-12V,+-5V,+-3.3V, etc. The wake up on event setting usually run off of the +5V, which should be about 1 Amp Rated. Each individual rail has a wattage rating. If any rail's wattage rating is exceeded then that means trouble for your computer.

I would remove all the PCI boards, recheck the PSU connector. Then check the video connection and the RAM connection. Then check the IDE Drive Connections. Then check to see if there are jumpers which you should of changed with a different Processor and verify the motherboard jumpers are set correctly. The Fan on the CPU may have to be plugged into the motherboard for the computer to boot.



If you do not like my post feel free to point out your opinion or my errors.

 

[nlm9802]

to further the dam analogy:

think of the 430 ft tall dam, and assume that the dam is refreshed at a steady rate (as a power supply is).
Now each component of your system has a straw to suck water out of the dam.
Say the CPU is pulling 30 ft of water idling, 100 under full load in a given time frame.
the hard drive is also pulling 20 idle, 50 under load
cdrom 5 idle, 25 reading, 30 burning.
now you put some insane power hungry item in there that wants 300 ft of water idle or in use.

well.. your system will run ok at idle.. 300 + 30 + 20 + 5 = 355 ft out of 430
under load you will run in to problems, 300 + 100 + 50 + 30 = 480 out of 430, seemingly random reboots and shutdowns are likely.

no matter how tall the dam is (10000 ft?) that straw will only pull a constant amount of water. so long as all the devices are pulling considerably (20% recommended) less than the rated output of the power supply you should be fine.

other devices will not draw power away from the cpu's voltage. If you download a motherboard monitoring utility it will show you this. start it up and watch the cpu, memory, agp, and 5/12V voltages. They will fluctuate, but not by much, no matter what you are doing with the hard drives, cdroms, etc. If they do change much I would get a new power supply.

 

[bjdobs]

Not to be way off base ... my son took apart a PC just the other day and when he put it back together it didn't work ... the issue is (and this is a very old issue) the IDE and or Floppy ribbon cables if installed backwards short out the Power Supply ... the power supplies are designed to shut down if there is a short on the outputs.

As for upgrading a power supply ... the only thing that may be a benefit is the ability to put more stuff in the box. Electronics don't take more power if you put a larger wattage unit in ... a pc that is using 80Watts is still going to use 80Watts regardless of you using a 100W or a 250W supply. Switching supplies (the type used in PC's) have two main design issues one is their constant current rating and the other is their peak current rating ... the closer your system runs to the constant current rating the more likely you could have hardware failures as the peak requirements may cause voltage fluctuations. Memory and Media writing is very critical and requires a stable voltage or data can be lost which in turn causes system hangs as code is no long valid.

 

[p0p]

ok i like the dam analogy...again, haha. i understand where you all are coming from, and with the exception of the cpu will not be effected by the watts being sucked up, im not saying your wrong at all, but if you dont mind could you supply me witha source that can further explain that to me?? like a site? only because its against everything i've been taught on the subject.

the motherboard problem is fixed, igot new one though, thats for the suggestion.

 

[cbs604]

I don't believe this discussion is still going....

pOp - if you apply a voltage to a device, say a simple fan, as long as the source can supply it, it will draw a certain amout of current depending on the internal resistance of the fan. The product of the volts and the current is the watts, or the power consumed. So if you apply 12 volts and the fan draws 2 amps, (big fan!) then the fan will consume 24 watts of power.

This is called Ohm's Law, the basis of all things electrical. Look here

http://www.electronics-tutorials.com/basics/ohms-law.htm.

Using my dam analogy, the voltage is the water pressure, the current is the flow, and the wattage is the amount of water consumed. Regardless if the dam is full or near empty the pressure will be the same (well not enough that you could detect); the flow will be the same, and therefore the amount of water you consume will be the same.

BTW everyone, I am writing this on a PIII 450 with 2 HDs and a CD-RW and it is quite happy to be supplied with a 165 watt psu, yes, 165 watts.




Cheers,
Brodie

 

[p0p]

i know ohms law, i cant believe its still going either.
i think i stated i knew i was wrong and felt educated, but if i didnt i am...educated, and i appreciate all of your help, i know a little more now thanks