Swap CPU for a cooler running 68030 in ACA630

Photon · 19 July 2013, 21:12

That is, I'm not "hacking it for speed", just hoping to reduce the heat.

I have the 25MHz version.

Is there an identical one with a lower nm mask that will run much cooler?

roy bates · 19 July 2013, 22:40

you can use one of a higher rated mhz,it should run a bit cooler.

or try to get the last mask 68030 at 50mhz.with gold top.i'll try to remember the last suffice.

i think the last one was a revision c 0.8 micron cpga rc component i think it was G40W (F91C) if someone could confirm please.

alexh · 20 July 2013, 09:37

Quote:

Originally Posted by roy bates

you can use one of a higher rated mhz,it should run a bit cooler.

I don't think that statement is true. It is my understanding that if it is the same silicon (i.e. the same mask.) it will produce the same amount of heat at the same clock frequency regardless of rating?

Quote:

Originally Posted by roy bates

i think the last one was a revision c 0.8 micron cpga rc component i think it was G40W (F91C) if someone could confirm please.

Correct. MC68030RC**C is the last version. They had two mask numbers (G40W and F91C) because they were manufactured at two different FABs.

Freescale stopped making 68030 in 2010 and stopped selling them in 2011/12 so you'll struggle to get a new one.

roy bates · 20 July 2013, 10:51

what i was thinking was to use a 50mhz part and run it at 25mhz,but you may be right there alexh,i cant find out now anyway.
i may of got that mixed with masks of b and c i did have both at one point(1.0 micron and 0.8)

Photon · 20 July 2013, 22:45

So this is the cooler running .8 micron one? And only F91C ones will be cooler, although the MHz doesn't matter? Just to confirm.

prowler · 20 July 2013, 22:51

Yep, that's the one!

(F91C or G40W mask)

roy bates · 21 July 2013, 01:22

yes indeedy.

Photon · 22 July 2013, 18:56

This any good?

Edit: well, google says it's 1um process from 1993, so noooope.

fitzsteve · 22 July 2013, 19:35

I think any gold 030 will run cooler than the original ceramic one on the ACA630 :-)

Photon · 22 July 2013, 19:50

Hmm... really?

alexh · 22 July 2013, 19:57

No. The same die will produce the same amount of heat for the same frequency regardless of packaging.

The increased thermal conductivity of the gold packaging will mean that the heat will pass to the heatsink and be dissipated by fan more efficiently but that heat amount will be the same and it still has to leave your A600 case.

I guess the CPU *might* be more stable as the heat will be leaving the package quicker.

roy bates · 22 July 2013, 20:00

its a revision b photon,probably 1.0 nm

fitzsteve · 22 July 2013, 21:25

Well in my experience I changed the 25mhz ceramic part for a 40mhz Gold CPU (sorry I don't remember the mask but I can check my old pics)

It seemed to run cooler although I didn't physically measure the temps, I also ran the ACA ocerclocked to 35mhz and later 40mhz and heat did not appear to be a problem

demolition · 22 July 2013, 22:33

A lower thermal resistance will mean a lower die temperature, even if the emitted power is the same for the same reason that proper usage of high quality thermal paste will lower the die temperature. The heat sink will have the same temperature in any case though, unless you find a way to change the heatsink-to-ambient resistance (e.g. a fan).

Photon · 23 July 2013, 00:33

This one I think steve?

Photon · 23 July 2013, 00:46

Seems Blizzard 1230 MKIV's were shipped with the F91C mask CPUs, I could spend 200EUR on one of those

roy bates · 23 July 2013, 01:58

Quote:

Originally Posted by Photon

Seems Blizzard 1230 MKIV's were shipped with the F91C mask CPUs, I could spend 200EUR on one of those

yes they did indeed,but that would be

looks like you might of got lucky

alexh · 23 July 2013, 07:53

D66C and C74N are both Revision B 1.0um parts. You're looking for an F91C or a G40W 0.8um part.

There is one on eBay now

http://www.ebay.co.uk/itm/MC68030RC3...item56575db68b

I know its from China but the markings are consistent with similar one sold on Amibay.

http://www.amibay.com/showthread.php?t=20759

Photon · 23 July 2013, 16:21

Does its markings also match those of a ship that blasted its way out of Mos Eisley?

Don't know if you've had trouble dealing with Chinese but mine have always kept their whispers. If someone was selling chips out of Far Fetchistan I'd be more suspicious

Thanks

So now I have 3 sources

alexh · 23 July 2013, 17:52

If you get one I'd be curious to know if you see any difference in heat.

Is there a thermistor on-board the ACA630 which you can read in software to check the temp?

Or is it a finger on the top kind of job?

Alex

19 July 2013, 21:12	#1
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,604	Swap CPU for a cooler running 68030 in ACA630 That is, I'm not "hacking it for speed", just hoping to reduce the heat. I have the 25MHz version. Is there an identical one with a lower nm mask that will run much cooler?

19 July 2013, 22:40	#2
roy bates Registered User Join Date: Apr 2011 Location: birmingham Age: 55 Posts: 2,827	you can use one of a higher rated mhz,it should run a bit cooler. or try to get the last mask 68030 at 50mhz.with gold top.i'll try to remember the last suffice. i think the last one was a revision c 0.8 micron cpga rc component i think it was G40W (F91C) if someone could confirm please. Last edited by roy bates; 19 July 2013 at 22:53.

22 July 2013, 18:56	#8
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,604	This any good? Edit: well, google says it's 1um process from 1993, so noooope. Last edited by Photon; 22 July 2013 at 19:07.

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20 July 2013, 10:51	#4
roy bates Registered User Join Date: Apr 2011 Location: birmingham Age: 55 Posts: 2,827	what i was thinking was to use a 50mhz part and run it at 25mhz,but you may be right there alexh,i cant find out now anyway. i may of got that mixed with masks of b and c i did have both at one point(1.0 micron and 0.8)

20 July 2013, 22:45	#5
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,604	So this is the cooler running .8 micron one? And only F91C ones will be cooler, although the MHz doesn't matter? Just to confirm.

20 July 2013, 22:51	#6
prowler Global Moderator Join Date: Aug 2008 Location: Sidcup, England Posts: 10,300	Yep, that's the one! (F91C or G40W mask)

21 July 2013, 01:22	#7
roy bates Registered User Join Date: Apr 2011 Location: birmingham Age: 55 Posts: 2,827	yes indeedy.

22 July 2013, 19:35	#9
fitzsteve Professional slacker! Join Date: Jul 2009 Location: Kent, UK Age: 44 Posts: 6,683	I think any gold 030 will run cooler than the original ceramic one on the ACA630 :-)

22 July 2013, 19:50	#10
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,604	Hmm... really?

22 July 2013, 19:57	#11
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,355	No. The same die will produce the same amount of heat for the same frequency regardless of packaging. The increased thermal conductivity of the gold packaging will mean that the heat will pass to the heatsink and be dissipated by fan more efficiently but that heat amount will be the same and it still has to leave your A600 case. I guess the CPU might be more stable as the heat will be leaving the package quicker.

22 July 2013, 20:00	#12
roy bates Registered User Join Date: Apr 2011 Location: birmingham Age: 55 Posts: 2,827	its a revision b photon,probably 1.0 nm

22 July 2013, 21:25	#13
fitzsteve Professional slacker! Join Date: Jul 2009 Location: Kent, UK Age: 44 Posts: 6,683	Well in my experience I changed the 25mhz ceramic part for a 40mhz Gold CPU (sorry I don't remember the mask but I can check my old pics) It seemed to run cooler although I didn't physically measure the temps, I also ran the ACA ocerclocked to 35mhz and later 40mhz and heat did not appear to be a problem

22 July 2013, 22:33	#14
demolition Unregistered User Join Date: Sep 2012 Location: Copenhagen / DK Age: 43 Posts: 4,190	A lower thermal resistance will mean a lower die temperature, even if the emitted power is the same for the same reason that proper usage of high quality thermal paste will lower the die temperature. The heat sink will have the same temperature in any case though, unless you find a way to change the heatsink-to-ambient resistance (e.g. a fan).

23 July 2013, 00:33	#15
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,604	This one I think steve?

23 July 2013, 00:46	#16
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,604	Seems Blizzard 1230 MKIV's were shipped with the F91C mask CPUs, I could spend 200EUR on one of those

23 July 2013, 07:53	#18
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,355	D66C and C74N are both Revision B 1.0um parts. You're looking for an F91C or a G40W 0.8um part. There is one on eBay now http://www.ebay.co.uk/itm/MC68030RC3...item56575db68b I know its from China but the markings are consistent with similar one sold on Amibay. http://www.amibay.com/showthread.php?t=20759

23 July 2013, 16:21	#19
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,604	Does its markings also match those of a ship that blasted its way out of Mos Eisley? Don't know if you've had trouble dealing with Chinese but mine have always kept their whispers. If someone was selling chips out of Far Fetchistan I'd be more suspicious Thanks So now I have 3 sources

23 July 2013, 17:52	#20
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,355	If you get one I'd be curious to know if you see any difference in heat. Is there a thermistor on-board the ACA630 which you can read in software to check the temp? Or is it a finger on the top kind of job? Alex

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