Yeah, I can confirm as well. Although, I use a copper heatsink with my MDD and it has worked like this since 2018 or so without any issue together with my MDX.

Covering half of the CPU core seems to be enough after all. I don't recommend anyone to do this, but it does work just fine

That's fascinating. After the time it took for me to find an MDX and the obscene amount I paid for it, I was not going to try that.

Two observations:
1) Even without doing any real scientific testing, I would surmise that the copper sink's small improvement in cooling over the "stainless" would likely be offset by the 25% loss of contact area, making the risk/reward ratio rather poor.
2) Again, no testing done but considering that OS9 mostly exercises only one proc, it's possible that no overheating risk would occur if that proc is the fully-covered one and the other is just basically idling. I would still be risk-adverse to trust the arrangement doing any processor-intense tasks in OSX however.    Knez: Do you run only OS9 on your MDD?

The reality may be that the 7447 just runs a little cooler than the 7450 anyway and so up to 1.8Ghz at least, they don't really require that fancy-pants copper cowboy anyway. For that matter, unless you're obsessed about noise, the MDX is perfectly happy with the tiny little Xserve–compatible sink with its little built-in fan that comes with it. One could even make the argument that's better overall in an MDD since it offers less obstruction to the airflow from the main fan and the tiny MDX fan is barely audible anyway. Of course, then we'd be into aerodynamics and how the original heatsinks sit right in front of the main fan directing the airflow through the fins and out the back but now we have a bunch of turbulence and inefficiency instead.

Of course, pushing to 2.0Ghz or beyond, all of the above goes right out the window and maximum cooling becomes paramount, despite the much–observed instability and crash–proneness (proneness?) at ludicrous speed.

Perhaps we should all just sit back and wait for one of our resident OCD's to try to TIG–weld an extension to the copper sink to cover that protruding proc……

                  I'll be here all week folks… don't forget to tip your waitress…   

you dont have to cut/modify any pins for compatibility with a sawtooth
they dont have ADC support to begin with

Yes, you are right, card was probably in a DA or above and then moved to the Sawtooth; so yes no taping needed, I stand corrected, of course no voltage/no ADC

you dont have to cut/modify any pins for compatibility with a sawtooth
they dont have ADC support to begin with

I had problems too to get SystemLink working. Turned out that the Digital in/out on my Tascam US428 was enough “processed” to mess with the control data so that the connection never got established. Don’t remember any more details but it eventually worked using another interface.

Covering half of the CPU core seems to be enough after all. I don't recommend anyone to do this, but it does work just fine

That's somewhat surprising! I'm glad it can work like that.