68030 not running at 25Mhz

[AmmoJammo]

should have tried the 25Mhz CPU with the 40Mhz crystal before replacing the cpu.

[AmmoJammo]

Somewhere a little below 5 Mips I think.

with no 32bit ram on the accelerator, it'll do ~0.9mips...
edit: actually, it will be even lower than this, most likely score the same as the stock CPU

with SOME 32bit ram, even just 512k, it should be doing ~4.8mips...
http://img211.imageshack.us/img211/8795/20120816182226.jpg

[AmmoJammo]

Havent received the 40Mhz stuff yet, still on it's way.

I was suggesting trying a faster crystal as the CPU you already have may run at 40Mhz just fine... mine is currently at 36Mhz

[AmmoJammo]

is the crystal thats currently in there around the right way? :p

[AmmoJammo]

same speed crystal I assume?

don't have any other speeds lying around do you?

[AmmoJammo]

Noooooooo! You will vaporize the cpu! :eek:

Attempting to overclock a processor beyond its limits won't simply result in it instantly failing...

Chances are it won't do anything with a 40mhz crystal.
Even if it does successfully boot, it won't just magically fail before you have a chance to run sysinfo and see what speed its running at.

[AmmoJammo]

I did say put the 40Mhz crystal in and see what happens... :p

that's pretty much the fastest crystal you're going to be able to use, unless you can clock the FPU at half the crystal speed too

[AmmoJammo]

The manual tells you can clock the FPU separate with another osc (upto 33 MHz, perhaps more) and it's auto-sensed - but can't see any place in the pics to put it in.

nor could I? plus I couldn't read German :p

My Mega Midget Racer has spots for two crystals, you can then use jumpers to either clock the FPU at the same speed as the CPU, using a single crystal, or clock it at its own speed, using a separate crystal...

[AmmoJammo]

Realistically, the FPU will take upto 40Mhz, but as someone mentioned, the memory might not, 30Mhz? maybe 33Mhz or even 36Mhz are all possible, but you'll still only be running the CPU at half this speed.

[AmmoJammo]

The issue may be that the memory won't run at the higher speeds anyway...

try with the 40Mhz crystal, see what happens, take it from there

[AmmoJammo]

FPU should be ok at up to 50Mhz.. that's whats in mine... so, try the 40Mhz, if that works, step it up!

at least IF the 50Mhz crystal works, you'll have the CPU at 25Mhz

edit: which FPU do you have? 68882? or 68881?
if the FPU doesn't work at higher speed, you can probably remove it and use a 60Mhz crystal, the specs say you can run the 68882 at upto 60Mhz, so I assume the rest of the card will accept this, I assume everything else is running at half this speed anyway.

[AmmoJammo]

did you get it, did you get it, did you get it, did you get it?

[AmmoJammo]

if you're going to try a 80Mhz crystal, take the FPU out first :p

[AmmoJammo]

ah, so that was new crystal, and new CPU?

interesting...

[AmmoJammo]

try removing the FPU?