Possible to replace the CPU in an A3000 with 50Mhz?

[mingle]

Hi,

Is it possible to swap/replace the 25MHz CPU in an A3000D with a 50MHz one (and the crystal, etc)?

Cheers,

Mike.

[redrumloa]

Hi,

Is it possible to swap/replace the 25MHz CPU in an A3000D with a 50MHz one (and the crystal, etc)?

Cheers,

Mike.

Simple answer, no.

[Plaz]

Hi,

Is it possible to swap/replace the 25MHz CPU in an A3000D with a 50MHz one (and the crystal, etc)?

No as Red says, however it is possible to do the 50mhz hack on the 68882 coprocessor. I've done it succesfully in the past, but I wouldn't recommend it on such old hardware anymore. Best if you found a separate accelerator card.

Plaz

[VingtTrois]

No as Red says, however it is possible to do the 50mhz hack on the 68882 coprocessor. I've done it succesfully in the past, but I wouldn't recommend it on such old hardware anymore. Best if you found a separate accelerator card.

Plaz

Replace: it's impossible (as REDRUMLOA writes below). But hack 25 to 50Mhz without changing FPU or crystal: YES.
@Plaz: Yep, me too.

68882 to 50Mhz without any problem. Orignal crystal of FPU is already at 50Mhz.
http://img204.imageshack.us/img204/9630/a3000rev63.jpg

Read here (in French, but u can see the pictures): http://obligement.free.fr/articles/fpu_a3000_50mhz.php

http://www.amiga-resistance.info/downloads/a3000fpuupgrade.jpg

Based on this article "68882 FPU of A3000 at 50MHz" :  http://aminet.net/docs/hard/A3000-50.lha

[joekster]

Why would it not be possible to unsolder the 50mhz crystal and replace with a faster one (like 66mhz) to overclock the 030/882? I belive that the A3000's 030 is async - so it should not screw up the custom chip timings... By the same thought - I guess it is possible (but really really hard) to unsolder the 030 and install a faster one...

[VingtTrois]

Why would it not be possible to unsolder the 50mhz crystal and replace with a faster one (like 66mhz) to overclock the 030/882? I belive that the A3000's 030 is async - so it should not screw up the custom chip timings... By the same thought - I guess it is possible (but really really hard) to unsolder the 030 and install a faster one...

The author of the article (on "obligement.free.fr") wrote that COMMODORE tested FPU on A3000 about 100MHZ, but any indication on the length of the test and if components all supported this frequency.

I think I will be possible to swap the 50Mhz by 66 or 80Mhz ! But...it's at your own risk if the FPU burns   8-)

[countzero]

OMG why torture the poor FPU with your pointless experiments ? what's the point of overclocking the fpu anyway ? any kind of improvement in any system related task ? No ? Then why risk burning your amiga for a stupid experiment ?

some ppl should not be given amigas ! (I mean not the spanish lesbians of course)

[tokyoracer]

some ppl should not be given amigas ! (I mean not the spanish lesbians of course)

:roflmao: You said it!

[Plaz]

OMG why torture the poor FPU with your pointless experiments ? what's the point of overclocking the fpu anyway ? any kind of improvement in any system related task ? No ? Then why risk burning your amiga for a stupid experiment ?

some ppl should not be given amigas ! (I mean not the spanish lesbians of course)

The FPU hack is not an experiment. Proven and works. Drop in a heat sink, maybe a fan.... My 3000 got that hack 10-12 years ago. Still runs fine. It was a cheap upgrade back in the day for those who wanted more rendering speed for graphics. If your one of those that kills ever thing you touch with a soldering iron then that's your problem.

And as I say... I don't recommend it any more. The hardware is too old, too scarce to replace and few need render speed hacks anymore.

Plaz

[Plaz]

Why would it not be possible to unsolder the 50mhz crystal and replace with a faster one (like 66mhz) to overclock the 030/882? I belive that the A3000's 030 is async - so it should not screw up the custom chip timings... By the same thought - I guess it is possible (but really really hard) to unsolder the 030 and install a faster one...

You maybe able to over clock a 3630 or 3640 expanson card that way, but you can't swap the CPU on the 3000 motherboard. There are too many other things on board counting on the timing coming from the existing crystal and CPU. You can't mess with them.

Plaz