I bought such a card for the Quadra PDS some years ago, but it was only after I acquired a 950 last year that I tried it out. It was a blue duck, never giving me anything but the dying four-chord farewell when the Mac was switched from 040 booting to the 601.
Out of curiosity I tried the card in a newly-acquired 700. This time the Mac booted into OS 8.1 without demur, and both ASP and TattleTech saw the CPU as a 601 at twice the 040's speed, ie 50MHz. Later, I left the Q700 idling while I went inside the house (a 15-m ethernet cable away) to check for conflict of its IP address with any other Mac in the LAN, and returned half-an-hour later to a dark display. The Quadra had not been 'seen' by any other Mac in its Chooser during the interval. I used the reset switch to restart, which produced the startup chords, but, before the raster even appeared the crash chords sounded. Two more restarts showed the same pattern.
So I pulled the mains cable for 30sec or so, and then replaced it and restarted from the keyboard. This time the Quadra fell over after appearance of the splash screen, which I take to show that there was no software/drive problem. Suspecting a possible thermal cut-out as the cause, I let the Mac sit for half-an-hour before starting it up again. This time it booted to the desktop, but it teetered there for only a few minutes before black screen/death chords took over.
The 601 upgrade card has a massive heatsink, so if this behaviour is the result of the processor's overheating, it must be that the ventilation streams inside the case miss the card by a wide margin, or flow too slowly past or across it. Is there any recorded experience of poor thermal tolerance in this upgrade, or is it possible that I have a card in which a thermal cut-out goes off prematurely? I add that I had already removed the heatsink and applied new thermal grease to the processor before putting the card into the 700.
de
Out of curiosity I tried the card in a newly-acquired 700. This time the Mac booted into OS 8.1 without demur, and both ASP and TattleTech saw the CPU as a 601 at twice the 040's speed, ie 50MHz. Later, I left the Q700 idling while I went inside the house (a 15-m ethernet cable away) to check for conflict of its IP address with any other Mac in the LAN, and returned half-an-hour later to a dark display. The Quadra had not been 'seen' by any other Mac in its Chooser during the interval. I used the reset switch to restart, which produced the startup chords, but, before the raster even appeared the crash chords sounded. Two more restarts showed the same pattern.
So I pulled the mains cable for 30sec or so, and then replaced it and restarted from the keyboard. This time the Quadra fell over after appearance of the splash screen, which I take to show that there was no software/drive problem. Suspecting a possible thermal cut-out as the cause, I let the Mac sit for half-an-hour before starting it up again. This time it booted to the desktop, but it teetered there for only a few minutes before black screen/death chords took over.
The 601 upgrade card has a massive heatsink, so if this behaviour is the result of the processor's overheating, it must be that the ventilation streams inside the case miss the card by a wide margin, or flow too slowly past or across it. Is there any recorded experience of poor thermal tolerance in this upgrade, or is it possible that I have a card in which a thermal cut-out goes off prematurely? I add that I had already removed the heatsink and applied new thermal grease to the processor before putting the card into the 700.
de
(60x) 13DT + 3PB + PTPro; (G3) 7DT/MT; (G4) 3T + PB. System 8.1 to OS 10.5.8
