Wanted: Advice on performing 68040 upgrade for Q605 — #12 nb: 40MHz is not always stable though. A heatsink/fan for the 040 would be a good idea. Click to expand... I can confirm it - at 40 MHz heatsink is a must and you should use a… 68kMLA Troubleshooting by trag Thu, 4 Feb 2010 - 16:28