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View Full Version : heatsink and fan

Nig
21st May 2001, 21:01
Does the fan push air into the heatsink or pull it out ?

Nig:)
Bluetack
21st May 2001, 21:11
Mine blows!

This is to put a constant air flow over the fins so they can then in turn soak up more heat :)
Nig
21st May 2001, 21:20
figured that.
this " new " system keeps switching itself off after about 30 mins.
The only thing ,apart from the fan aint big enough is that it's going round the wrong way.I changed the heatsink for one that had a flatter bottom today.

don't think it can be anything else???? unless....

ps .what's the pinout on the mobo where it says fan ?never used one before .

Nig:)
pudds
21st May 2001, 21:52
Have you got an automatic shutdown tempeture setting in the bios? Maybe its set too low?
MTDay
21st May 2001, 21:56
The trend on fan connectors is to use 3 pins - 2 are power and 1 is a rotation pulse for monitoring.

You may be able to find sites that suggest that you lap the heatsink, or even the CPU
http://www.benchtest.com/lap.html
This refers to the Celeron CPU - the principle of lapping the heatsink is the same, and a LOT SAFER.

Is the PSU good enough?
A 300W unit is not overkill for a modern, fast CPU with the expected heavy duty graphics card - if THEY didn't use POWER, they wouldn't have heatsinks!
Nig
21st May 2001, 22:11
Good point about the psu
It's not a modern fast [cpu amd 333] but the case and psu is an old 486 AST rated at 145w continuous .
would the psu shutdown everything ?
Symptoms .. black screen ,loud click . the cpu and psu fans keep turning .dunno about the hard drives .

Dunno about the bios , never used ami bios before and I can't find it mentioned. the board spec says it has it .

Nig:)
MTDay
22nd May 2001, 00:37
145 Watt PSU is a bit weedy for a pentium class machine.

If its "on the edge", then it can have strange effects - that's why they recommend 300w for an AMD Athlon - it may hold with less, but a momentary peak in demand can push it over the edge.

I suppose if you have a CD drive, you can disconnect that, and/or pull out half the memory if it has more than one full bank (2 simms per bank)

If it survives longer/indefinitely, then that does incriminate the power supply - if the box is standard, you may be able to get a PSU at a computerfair, otherwise it's a new case!
Nig
22nd May 2001, 06:47
Just had a look here
http://www.pcindex.co.uk/results_Pro.asp?Company=&Category=37&Maker=&PartDescr=&order=price&id=247132898

There's a boatload of cases with psu rated at 145 or 150 w ,some of them expensive too.
So , by my reckoning ,if they still sell them for new systems they must be OK .[ish]
gonna get a new socket7 fan today .

What's PS2/PS3 ?

Nig:)
Nig
23rd May 2001, 18:20
Sorted.

Only guessing but this is what I think...

Windows had detected the new mobo and all the stuff on it like new pci and pci bridge etc .
It then discovered the extra power supply, the board has at and atx sockets .
For some reason it assumed that the second power supply was mains and the first battery
then after 30 mins or so it switches to mains [atx] to save battery power

= dead system .

All I had to do was uncheck " allow windows to manage power use on this computer ".

Nig:)
MTDay
23rd May 2001, 20:52
Power management can certainly be flaky!

If you want to use it, you normally have to set the BIOS for APM control.

If BIOS power management is on, but NOT set for APM, that may cause problems. Certain devices and drivers can also cause hassle with power management - and unless you allow the machine to idle for hours, PM does very little other than annoy you when it has to be woken up again!