BIOS Updates forum

Posted: **Thu Mar 06, 2003 8:51 pm**

have i to cool my old 486DX2-50MHz processor? or is it possible to overheat it without a cooler?

Posted: **Thu Mar 06, 2003 9:24 pm**

IIRC, 50Mhz or greater needs a heatsink and fan.

Posted: **Thu Mar 06, 2003 11:23 pm**

Yes, it does need a HSF. Or a huge heatsink/no fan (as seen in some Compaqs).

Posted: **Fri Mar 07, 2003 2:30 am**

Cooling is needed from 40MHz and up but passive might be enough
I had a 33MHz long time ago and it used to be a little hot

Posted: **Fri Mar 07, 2003 10:37 am**

Intel overdrive DX4-100 has passive heatsink glued on at the factory
AMD 586-120@160MHz (aka PR75) I use active (you could try a BGA cooler).
i486-DX50 (not dx2-50) I have with passive heatsink glued on by integrator.

Posted: **Fri Mar 07, 2003 2:26 pm**

I had i486DX/33 without heatsink, one i486DX/50 was at work (no heastink too). Then I had STMicroelectronics (Cyrix OEM) 486DX2/80 with heatsink and fan - however the fan died so I removed it and it still works fine

I have also one i486DX2/66 overclocked to 80 - it requires heatsink AND fan to be stable.

Posted: **Fri Mar 07, 2003 8:52 pm**

Depends on voltage,too
All 5V version from 40MHz on should be cooled passive and from 66MHz active
But 66/75/80MHz 3.3V may not need any cooling

Posted: **Fri Mar 07, 2003 9:08 pm**

All my 486s were/are 5V. Don't know why there was no heatsink on the 486DX/50.
The i486DX2/66 is 5V CPU. But it runs fine at 3.3V at 66MHz. At 80MHz, it needs full 5V

Posted: **Sat Mar 08, 2003 12:51 pm**

oh, it's a little bit difficult to translate the specific words into german

but i think you also tried to overclock these 486? is it possible?

Posted: **Sat Mar 08, 2003 1:15 pm**

If it's DX2/50, you can try to run it at 66MHz (2x33). You will need heatsink with fan to do it.

Posted: **Tue Mar 30, 2004 1:03 am**

Have, or had really, an IBM ps/2 with an Intel 486 DX2 50MHz (stuck on socket on cpu board).
It has no heatsink but the case was well ventilated.
I only have the cpu board left now the machine is going to the dump tomorrow.

Posted: **Sun Jun 27, 2004 3:49 pm**

disabling turbo mode would put it into 33mhz enhanced.
I do it when I donthave aheatsink but i wouldnt try it ona dx-100 lol.
thus 33 enhanced is safe withoutheatsink in myexperience but i dont remember my dx-50's core voltage.