|Machine||Max Oscillator||Max Speed|
If you accelerate one of these cards, you should put some extra cooling device(s) on the giant heatsink unless you use it as a frying pan to cook on. Two fans mounted on extruded heatsinks and mounted on the card work wonders (no more burns when you pull out the card).
I was just recently made aware of a wonderful trick for PPC PDS card users who never switch back to their 68040 processor. If you pull out the 68040 (be very careful, and take your time), your PPC PDS card will be able to run at slightly higher frequencies without the video artifacts that show up when the 68040 is in place at those frequencies. I have seen this in C650-mod and Q800 machines where the PPC PDS cards now run at 79MHz without any video artifacts. I am extremely curious about what will happen if this is tried in a C610 or Q610. If someone gives it a shot, please drop me a line.
I keep getting e-mail from people looking for one of these cards, so I hope this helps. The cards were discontinued several years ago, so they can probably only be obtained as used hardware. If I were looking for one I'd try the back of some of the Mac magazines, or maybe MacResQ or Pre-Owned Electronics Inc.