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dougal
29th March 2012, 11:02
My GVP Combo '040 has no fan, just heat sink.

I heard that some come with fans and some don't. Mine is running fine with no problems so should i just leave it without a fan or should i add one ?

If so what type of fan should i look for ?

Xanxi
29th March 2012, 11:15
Mine has a fan. A fan is necessary for a 68040@33 MHz and, considering that the CPU is facing to the floppy drives in the A2000 with very little airflow, you should add one.

alexh
29th March 2012, 11:17
Depends on the revision of 68040. Later chips are much cooler than 1st gen.

dougal
29th March 2012, 12:44
Is there another way i could check the revision of the cpu without having to remove the heatsink ?

Is WhichAmiga accurate ?

Justin
29th March 2012, 13:29
personally i perfer to have a fan on everything, it can only help matters no matter what

http://www.ebay.co.uk/itm/Scythe-Mini-Kaze-50mm-x-10mm-5cm-Quiet-Fan-/200707348205?pt=Computing_ComputerComponents_Fans_Heatsinks_SR&hash=item2ebb1716ed

CrashMidnick
29th March 2012, 15:02
On 040's, I would stick a fan too... There is no place for the cpu to breath in the A2K.

Uncle_Meat
29th March 2012, 15:22
How warm does it get to the touch?

Meh. Stick a small heatsink and fan on there anyway. Cool CPUs are happy CPUs.

mjnurney
29th March 2012, 15:45
040 25mhz +

Always put a hinksink on as a min requirement , 33mhz + , a fan too

alexh
29th March 2012, 16:34
While a good rule of thumb for Amiga's it's not true for all mask revisions of 040!

I've got one of each mask (except the L88M which is the coolest) and later ones don't need a heatsink let alone a fan. At 25MHz they are only just warm to the touch.

The vast majority of Amiga 040's are early ones though.


-----------------------------------

In 1989 it went into production as the XC68040RCxxyy originally a 0.8um
masks (D43B, D50D, D98D, E31F) part. These run exceptionally hot even
at 25MHz and need heatsinks all the time.

http://www.freescale.com/files/shared/doc/pcn/PCNR00274.html

In 1995 the 68040 qualified to mc status. It was shrunk to a 0.65um
mask (E42k) these parts run hot at 25MHz but _dont_ need heatsinks,
famous in MAC circles for overclocking. There are some XC 0.65um parts
from 1992-95 with the mask E26A but I am unsure as to their
availability, heat dissapation or overclockability.

http://www.freescale.com/files/shared/doc/pcn/PCN5606.txt

In 2000 the 68040 was shrunk to a 0.57um mask (K63H) these run a lot
cooler that all previous parts and again do not need heatsinks at
25MHz+.

http://www.freescale.com/files/shared/doc/pcn/PCN8219.htm

Finally in 2002 the last MC68040RCxxA mask was made (L88M) production
was moved back to MOS11 FAB, again at 0.57um, with increased
reliability (which should favour overclocking even more).

There were probably intermediate mask revisions, but I have no
information (yet) about them.

Some XC chips have a H in their title, e.g. XC68040HRC33E Not quite
sure what the H stands for.

There were several revisions of some chips. The revision is the last
digit on the end of the number, some have no letter, some go all the
way to M. I do not fully understand the version numbers.

I would imagine the best 68040 to get for an Amiga would be an
MC68040RC40A with mask L88M, it should run coolest and support the best
overclocking.

Zetr0
29th March 2012, 16:39
My GVP Combo '040 has no fan, just heat sink.

I heard that some come with fans and some don't. Mine is running fine with no problems so should i just leave it without a fan or should i add one ?

If so what type of fan should i look for ?


add nice - 5v chipset cooler fan....

job done =)

cosmicfrog
29th March 2012, 17:05
indeed what dose it feel like when you touch the heat sink ??? as a rule of thumb if its to hot to touch it needs a fan

Zetr0
29th March 2012, 17:33
if its hot to the touch that means the heat sink is working ;)

if you have the opportunity to put a fan on the cpu then I would humbly suggest to do so.... arguably the cooler the chip the longer it will last.

dougal
29th March 2012, 18:24
Ok so the votes are in and looks like i should be buying a CPU cooler.

I hope I can find one that will attach to the accelerator's factory heatsink.

rkauer
30th March 2012, 03:07
Scavenge a laptop CPU fan and stick it over the floppy (if there is enough clearance) blowing air to the heatsink and all will be good.

No space over the floppy? Put same fan under it.