Glad to hear you made it out the other side of Irma. Hats off to you for your public service. In this age of pervasive infrastructure-based communication, the public doesn't always realise the importance of point-to-point communication and HAM operators until an event or disaster disrupts or destroys said communications infrastructure.
As for RAM timing, don't forget the 4MiB of system RAM soldered to the logic board. 80ns should be okay at 33MHz, but at 40MHz, my rudimentary math with clock latency leads me to believe that the RAM needs to be 75ns or faster. I've successfully overclocked to 41MHz using 60ns RAM, but I haven't tried 70ns. If the soldered RAM is 80ns, this might preclude running the board at 40MHz reliably. The same probably applies to VRAM modules. I've had very poor luck with 80ns VRAM above 33MHz, but I've had luck with 70ns to 41MHz. Unfortunately, I've found the 70ns or faster VRAM is pretty scarce.
Edited by rsolberg, 13 September 2017 - 10:01 PM.