Extreme Amiga overclocking.

[adolescent]

@DoomMaster

Your Car vs. Locomotive logic is flawed as they are completely different things, built for completely different tasks.  A FASTER CPU of the same type, on the same board, will do MORE WORK, period.  A 28MHz 040 is faster than a 25MHz 040, period.  

As for reliability, I'd suggest it's your system, as the PP&S fan is sufficient to cool the very slightly overclocked CPU.  Clocking the board down could cause more problems because it was designed to run at a certain speed.    

[adolescent]

BoingBoss wrote:
Now for the 68040 processor.  The XC68040 is the 5 volt version.  The MC68040 is the 3.3 volt version and is very hard to find.  I have been looking for one on eBay for months and have not been able to find one.  All of the
sellers only have the XC version for sale.

Again with incorrect facts.  

The 3.3V 040s are the MC68040V (no-FPU) or MC680EC040V (no-MMU/FPU).  The V designates the low power, all the other models are 5V, no matter if they are MC or XC.  The V series chips are not pin compatible with standard 040s.

As for the one that said the 040 was the worst.  Hindsight has probably proved that.  But, at the time it was the best, and is still leagues ahead of the 020-030 chips in speed.  (A 40MHz 040 is more than twice as fast as a 50MHz 030).  

[adolescent]

BoingBoss wrote:
The problem I am having is that my Amiga 2500 will not "see" the memory on the Progressive 2000/040 board.  SysInfo sees the 68040 processor just fine, but not the SIMMs.  I am sure that I have the jumpers set correctly, but just in case, how should they be set?  I need the extra memory because I am working with 24-bit graphics and the 8 megs on the Zorro II bus is not enough.  I need at least 8 to 16 megs of 32-bit memory in order to use my GVP EGS 28/24 Spectrum video board to its fullest potential.   :roll:

RTFM. :roll:  What version of the software?  What command line are you using to initialize the card?  AFAIK, early versions required AddMem, but later ones have it built into the Init040 utility.  Have you tried the MemTest program?

[adolescent]

BoingBoss wrote:
Hi adolescent,

Again with incorrect facts.

No, I am correct.  You yourself even stated that the "MC" version was the one with the lower voltage.

Not all of the 3.3 volt chips had a "v" at the end.  MANY of them were misprinted and sold to companies like Progressive and GVP at a lower cost.

No, you are not correct (again).  MC and XC have nothing to do with the chip voltage, period.  I have a MC68040@40Mhz that is a 5V chip.  All 3.3V 040s have the V designation.  There is no way that GVP and Progressive used the 3.3V chips.  They are not pin compatible, and are not interchangable.  Plugging a 3.3V chip into a 5V socket would no doubt result in a puff of smoke and an unusable computer.

[adolescent]

Brian wrote:
@adolescent
The MC68040V have FPU and MMU, the MC68EC040V doesn't.

No, the MC68040V is a low voltage version of the MC68LC040, therefore lacks the FPU like the MC68LC040.  From the user guide (sorry to jump around, but the guide is in a different order.)

APPENDIX C MC68040V AND MC68EC040V

For the MC68040V, all differences that exist between the MC68LC040 and the MC68040, as described in Appendix A MC68LC040, also apply to the MC68040V.

APPENDIX A MC68LC040

A.1 MC68LC040 DIFFERENCES
...
The MC68LC040 does not contain an FPU, which causes unimplemented floating-point exceptions to occur using a new eight-word stack frame format.

[adolescent]

@Brian

No problem.  I noticed they said it's 100% compatible there, whereas Motorola also say it's not pin compatible.