Amiga.org
Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: pyrre on October 16, 2007, 09:34:36 PM
-
I have a PPC with a 040 cpu running at 25 MHz.
On the ppc there is a multiplier that is currently set to 0.5 hence the 25 MHz... If i add a LARGE sink and fan to it. would it be safe to run the 040 at 50Mhz?
-
If i add a LARGE sink and fan to it. would it be safe to run the 040 at 50Mhz?
No.
-
It would be much safer to get your board upgraded to an 060
-
A 25 MHz 68040 can usually overclock between 30 and 40 MHz. A 40MHz 68040 can usually overclock from 42 to 48 MHz. There are probably some 68040's that will overclock to 50MHz but they would be newer. Look for a MC68040RC40 instead of XC68040RC40 and a later letter revision at the end as they may have a reduced size mask. There is 40 MHz 68040's on E-bay...
http://cgi.ebay.com/Motorola-68040-processor-XC68040RC40M-02E31F_W0QQitemZ230156322274QQihZ013QQcategoryZ4663QQtcZphotoQQcmdZViewItem
Be aware that at least 90% will not work at 50MHz and then will need excellent cooling and generate a lot of heat. The 68060 runs much cooler you should consider it as well. Check out Dave's Amiga (overclocking) Hardware page before doing anything...
http://members.iinet.net.au/~davem2/amiga.html
Do a lot of research before you do anything. Good luck.
-
It would be much safer to get your board upgraded to an 060
Would a "socket 7" socket work?
Have some old pentium boards laying around somewhere...
-
The 68060 will fit in the same socket where your 68040 is now. The 68060 is 3.3V where the 68040 is 5V so you would destroy a 68060 if you put one in. You need a voltage regulator to reduce the voltage from 5V to 3.3V. There is probably a place already on your board for the voltage regulator and a surface mount jumper or two would likely have to be changed as well. See Dave's site.
-
you would destroy a 68060 if you put one in
After reading a lot about it, on the PPC board there is ways to select the voltage between 5 and 3.3V. And to change the multiplyer from 0.5 to 1.
So the BPPC card is ready for conversion to 060. And it will start up with the 060 instead of the 040. But just enough to flash the firmware to 060 content.
I have done a lot of research on that. But I have no clue to where I can get the parts needed... Mainly the 060 though...
BTW the 060 MUST be of a MC 060, not any ec or lc... not even if they clock well...!
Edit:
The 68060 will fit in the same socket where your 68040 is now
I have no socket, it is soldered to the board...
-
20-30% above the specified speed is usually the limit of safely over clocking many CPUs. I've tried to overclock 2 different 040/25 cards in the past. No matter the size of the heat sink, they didn't like running at 33mhz. Others have had better luck than I though.
Plaz
-
http://cgi.ebay.com/Motorola-68060-CPU-XC68060RC50A-01G65V-Fully-Working_W0QQitemZ230168074404QQihZ013QQcategoryZ164QQtcZphotoQQcmdZViewItem
Item location: Guangzhou, China
Quantity: 6 available
-
You might want to contact PG (on this board). He can upgrade your board to an 060.
--
moto
-
Nah, you don't want 3.3V for an '060.... Try about 3.6 and a BIG heatsink, shoot for 90Mhz :-D