A3640 overclocking/upgrading - Page 3

hdtv_maniac · 31 March 2012, 17:29

Hi, I have a question, I think the overclocking my a3640 to 30 MHz
My equipment is A4000, CV64, Super Buster 11 Rev. B
But worried I'm afraid there may be problems with the card Zorro and generally overload the motherboard if it is healthy for my A4000?

SpeedGeek · 31 March 2012, 18:55

I would be surprised if you a had any problems at all with mere 30 MHz on an A4000! Your more likely to have problems from a weak +5V supply or failed SMD electrolytic caps than a mere 30 MHz.

hdtv_maniac · 31 March 2012, 19:01

i have all caps reaplecement new in MOBO , and new caps in PSU
power is very good , A3640 have new Caps tantalum with good polarizations that all system is ok
You say this is good idea in mein system overclocking a3640 to 30mhz is better than 25mhz?

prowler · 31 March 2012, 22:27

Quote:

Originally Posted by hdtv_maniac

You say this is good idea in mein system overclocking a3640 to 30mhz is better than 25mhz?

Overclocking a 68040 processor is never a good idea IMO.

68040 processors are notorious for running hot - even at the rated speed - and overclocking will only exacerbate the problem and shorten its life.

If you really must overclock it, make sure that the heatsink is making good thermal contact with the processor and that the fan is unobstructed and operating properly.

rkauer · 01 April 2012, 00:47

Another good measure is buying a replacement MC 68040 from anywhere you can source one.

The MC parts are a lot cooler than the XC series used originally in Amiga accelerators. The latest L88M mask can even run without any cooling at 33MHz!

hdtv_maniac · 01 April 2012, 09:08

I still have 68040 33MHz processor, if I had put into this card and overclocked 60MHz oscilator to 30MHz CPU is not walked by on his power and would not have warmed

i have this in link
http://www.efunzine.com/efnz.php?a=p...984b7dd183a065

tom256 · 04 April 2012, 03:45

Quote:

Originally Posted by prowler

Overclocking a 68040 processor is never a good idea IMO.

68040 processors are notorious for running hot - even at the rated speed - and overclocking will only exacerbate the problem and shorten its life.

If you really must overclock it, make sure that the heatsink is making good thermal contact with the processor and that the fan is unobstructed and operating properly.

I disagree.
Overclocking is good idea with MC68040. Raising frequency from 25MHz to 33MHz give you a nice boost.

Overclocking won't shorten life. Heat and voltage is your enemy. But you will not touch voltage so the only problem is heat, which could be eliminated by using radiator and fan.

IMO overclocked CPU but well cooled will live longer that not overclocked but poor cooled.

8bitbubsy · 04 April 2012, 16:38

Does the A3640 run 100% stable/compatible with the 1:1 clock-hack? I mean, I guess there's a reason they originally put the clock-halfer there..? Does this change any of the timings used on the Amiga 4000 motherboard?

If it's 100% sure that both the Amiga and the A3640 technically is OK with this then I guess it doesn't hurt. Just get some thermal paste, a good heatsink and a fan cooling it and you're good to go.

roy bates · 04 April 2012, 17:11

dident they make one at 33mhz?

8bitbubsy · 05 April 2012, 06:58

Quote:

Originally Posted by roy bates

dident they make one at 33mhz?

Nope, 25MHz only.

delshay · 05 April 2012, 21:56

maybe 68040v can solve heat/overclocking problems.

hdtv_maniac · 06 April 2012, 08:36

i think , overclocking A3640 is too overclocking MOBO, ramsey , super buster , this is no good MOBO faster die

roy bates · 06 April 2012, 10:27

Quote:

Originally Posted by hdtv_maniac

i think , overclocking A3640 is too overclocking MOBO, ramsey , super buster , this is no good MOBO faster die

i dont think any of this is true

hdtv_maniac · 07 April 2012, 10:29

roy bates , I read in many topics, "a3640 overclocking is to overclocking all chipset MOBO a4k ramsey , super buster , zorro card problem

roy bates · 07 April 2012, 10:43

well ok,if you dont want to overclock your card dont do it.its your choice

SpeedGeek · 07 April 2012, 18:29

There is still much misunderstanding about the A3640. The 040 itself requires 2 clocks (BCLK and PCLK). So any 040 based CPU card requires a clock divider or clock doubler to generate one of these clocks!

The A3640 is a synchronous design so when you over-clock it you also over-clock the motherboard. A4000 motherboards can over-clock at least 5 MHz more than A3000 motherboards. A4000's do not have the notoriously timing intolerant Ramsey and they can use faster 60ns SIMM's.

The 68040V is 3.3 volt chip and has no FPU. It would run cooler than the 5 volt chips but is not practical as a plug in replacement. So get a cooling fan or the latest mask set of the 5 volt version.

Over-clocking is unlikely to damage the 040 or any motherboard custom chips. You will be more likely to find an upper limit where the system is unreliable. Then timing, cooling and power supply modifications are needed to solve the reliability problem. Finally, you reach the upper physical limits of the logic itself.

hdtv_maniac · 13 April 2012, 11:24

im overclocking my a3640 to 60 mhz oscillator and card not work not boot , im replace back 50mhz oscilattor and card work Fine

SpeedGeek · 14 April 2012, 02:00

@hdtv maniac

Did you try the delay line hack? It modifies the CLK90 timing, but some A3640's may work without it. As always, your mileage will vary!

hdtv_maniac · 14 April 2012, 10:02

im have no tried delay line , Will it work in case of a 50 MHz oscillator back
when im cut this line?

hdtv_maniac · 16 April 2012, 22:15

refresh

31 March 2012, 17:29	#41
hdtv_maniac Banned Join Date: Mar 2012 Location: Illinois Posts: 8	A3640 overclocking Hi, I have a question, I think the overclocking my a3640 to 30 MHz My equipment is A4000, CV64, Super Buster 11 Rev. B But worried I'm afraid there may be problems with the card Zorro and generally overload the motherboard if it is healthy for my A4000? Last edited by prowler; 22 April 2012 at 21:06. Reason: Rewind.

31 March 2012, 19:01	#43
hdtv_maniac Banned Join Date: Mar 2012 Location: Illinois Posts: 8	i have all caps reaplecement new in MOBO , and new caps in PSU power is very good , A3640 have new Caps tantalum with good polarizations that all system is ok You say this is good idea in mein system overclocking a3640 to 30mhz is better than 25mhz? Last edited by prowler; 22 April 2012 at 21:07. Reason: Rewind.

01 April 2012, 09:08	#46
hdtv_maniac Banned Join Date: Mar 2012 Location: Illinois Posts: 8	I still have 68040 33MHz processor, if I had put into this card and overclocked 60MHz oscilator to 30MHz CPU is not walked by on his power and would not have warmed i have this in link http://www.efunzine.com/efnz.php?a=p...984b7dd183a065 Last edited by prowler; 22 April 2012 at 21:08. Reason: Rewind.

06 April 2012, 08:36	#52
hdtv_maniac Banned Join Date: Mar 2012 Location: Illinois Posts: 8	i think , overclocking A3640 is too overclocking MOBO, ramsey , super buster , this is no good MOBO faster die Last edited by prowler; 22 April 2012 at 21:08. Reason: Rewind.

07 April 2012, 10:29	#54
hdtv_maniac Banned Join Date: Mar 2012 Location: Illinois Posts: 8	roy bates , I read in many topics, "a3640 overclocking is to overclocking all chipset MOBO a4k ramsey , super buster , zorro card problem Last edited by prowler; 22 April 2012 at 21:09. Reason: Rewind.

31 March 2012, 18:55	#42
SpeedGeek Moderator Join Date: Dec 2010 Location: Wisconsin USA Age: 60 Posts: 839	I would be surprised if you a had any problems at all with mere 30 MHz on an A4000! Your more likely to have problems from a weak +5V supply or failed SMD electrolytic caps than a mere 30 MHz.

01 April 2012, 00:47	#45
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	Another good measure is buying a replacement MC 68040 from anywhere you can source one. The MC parts are a lot cooler than the XC series used originally in Amiga accelerators. The latest L88M mask can even run without any cooling at 33MHz!

04 April 2012, 16:38	#48
8bitbubsy Registered User Join Date: Sep 2009 Location: Norway Posts: 1,709	Does the A3640 run 100% stable/compatible with the 1:1 clock-hack? I mean, I guess there's a reason they originally put the clock-halfer there..? Does this change any of the timings used on the Amiga 4000 motherboard? If it's 100% sure that both the Amiga and the A3640 technically is OK with this then I guess it doesn't hurt. Just get some thermal paste, a good heatsink and a fan cooling it and you're good to go.

04 April 2012, 17:11	#49
roy bates Registered User Join Date: Apr 2011 Location: birmingham Age: 55 Posts: 2,827	dident they make one at 33mhz?

05 April 2012, 21:56	#51
delshay Registered User Join Date: Jan 2011 Location: uk Posts: 245	maybe 68040v can solve heat/overclocking problems.

07 April 2012, 10:43	#55
roy bates Registered User Join Date: Apr 2011 Location: birmingham Age: 55 Posts: 2,827	well ok,if you dont want to overclock your card dont do it.its your choice

07 April 2012, 18:29	#56
SpeedGeek Moderator Join Date: Dec 2010 Location: Wisconsin USA Age: 60 Posts: 839	There is still much misunderstanding about the A3640. The 040 itself requires 2 clocks (BCLK and PCLK). So any 040 based CPU card requires a clock divider or clock doubler to generate one of these clocks! The A3640 is a synchronous design so when you over-clock it you also over-clock the motherboard. A4000 motherboards can over-clock at least 5 MHz more than A3000 motherboards. A4000's do not have the notoriously timing intolerant Ramsey and they can use faster 60ns SIMM's. The 68040V is 3.3 volt chip and has no FPU. It would run cooler than the 5 volt chips but is not practical as a plug in replacement. So get a cooling fan or the latest mask set of the 5 volt version. Over-clocking is unlikely to damage the 040 or any motherboard custom chips. You will be more likely to find an upper limit where the system is unreliable. Then timing, cooling and power supply modifications are needed to solve the reliability problem. Finally, you reach the upper physical limits of the logic itself. Last edited by SpeedGeek; 27 April 2021 at 15:56.

13 April 2012, 11:24	#57
hdtv_maniac Banned Join Date: Mar 2012 Location: Illinois Posts: 8	im overclocking my a3640 to 60 mhz oscillator and card not work not boot , im replace back 50mhz oscilattor and card work Fine Last edited by prowler; 22 April 2012 at 21:10. Reason: Rewind.

14 April 2012, 02:00	#58
SpeedGeek Moderator Join Date: Dec 2010 Location: Wisconsin USA Age: 60 Posts: 839	@hdtv maniac Did you try the delay line hack? It modifies the CLK90 timing, but some A3640's may work without it. As always, your mileage will vary!

14 April 2012, 10:02	#59
hdtv_maniac Banned Join Date: Mar 2012 Location: Illinois Posts: 8	im have no tried delay line , Will it work in case of a 50 MHz oscillator back when im cut this line? Last edited by prowler; 22 April 2012 at 21:11. Reason: Rewind.

16 April 2012, 22:15	#60
hdtv_maniac Banned Join Date: Mar 2012 Location: Illinois Posts: 8	refresh Last edited by prowler; 22 April 2012 at 21:11. Reason: Rewind.

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