overclocking an 1260

[TCH]

I have a Blizzard 1260 with an XC68060RC50 running on 66 MHz. The card is slightly modified already, it has a cooling fan on the CPU and the oscillator is changeable. Currently it runs stable.
My question is, can i install a 75 MHz one without damaging the card or the CPU? Can this type of 060 bear this clock rate if it has a cooler on it? Will it be stable or i will experience crashes?

[Toryglen-boy]

Originally Posted by TCH

I have a Blizzard 1260 with an XC68060RC50 running on 66 MHz. The card is slightly modified already, it has a cooling fan on the CPU and the oscillator is changeable. Currently it runs stable.
My question is, can i install a 75 MHz one without damaging the card or the CPU? Can this type of 060 bear this clock rate if it has a cooler on it? Will it be stable or i will experience crashes?

whats the mask on the CPU? my 68060 is a 50Mhz part @75Mhz, although its a revision 6, thats a late mask, and runs very cool. I am held back by the SCSI on it spazzing out, than anything else.

The factors will be heat and memory, and voltage. pushing the 060 up, might use more voltage, at any rate, it will certainly produce more heat, and to avoid thermal electromigration, it would have to be cooled nicely. its a matter of try and see. oh, and before the logic on the board goes from overclocking, the RAM might, make sure you have some good 50ns or 60ns RAM

[liviux76]

If your cpu is a revision 1 I am pretty sure that it can't work at a clock higher than 66MHz.

I say that because I have a Blizzard 1260 with a CPU revision 1 clocked at 66MHz and when I've tried a higher clock (72 MHz) I immediately got errors at the boot of the OS.

Mine has a cooler with a fan and it works perfectly stable at 66MHz, never had an issue even leaving the computer running for days.

[trixster]

A Rev 1 060 won't manage much more than 66mhz. A Rev 6 060 with cooling will manage much more than the logic on the board can handle. To reach 72+ MHz you'll need a Rev 6 cpu, cooling, 50ns or good 60ns ram, and luck.

[Daedalus]

I have the same experience with a rev. 1 060 - runs happily for days on end at 66MHz (and has been like that for ~15 years). That's on the edge of the SCSI capabilities though - that could be unstable at 66MHz or perfectly fine, depending on its mood. I run mine at 64MHz (or 60? I can't remember...) these days and both the CPU and the SCSI are rock solid.

[TCH]

The mask is 01G65V and the part number is QECY9649B. So, i think, it's a rev2. Can that be overclocked?

[Photon]

Originally Posted by trixster

A Rev 1 060 won't manage much more than 66mhz. A Rev 6 060 with cooling will manage much more than the logic on the board can handle. To reach 72+ MHz you'll need a Rev 6 cpu, cooling, 50ns or good 60ns ram, and luck.

This.