Upgrading an 030/25 mhz accelerator

[DamageX]

If the accelerator was designed to run at only one speed (25MHz) then you'd be lucky to get it running at 50MHz even with the faster CPU and RAM. If it was designed to run at multiple speeds and/or has jumpers concerning memory timing then that would be more promising.

Since 60ns SIMMs are relatively easy to find and easy to exchange you might as well put those in first and then try to get the CPU running as fast as possible with memory latency as low as possible.

[DamageX]

I guarantee there are waitstates, the question is how many. If I understand correctly, an '030 could complete a memory access in 2 cycles, or a 4-word "burst" in 5 cycles. But if you're over 16MHz then even 60ns DRAM is already too slow for that ideal timing.

A GVP A3001 with '030-50MHz, 60ns RAM, and no burst mode, is 85% faster than a CBM A2630 with '030-25MHz, 100ns RAM, and no burst mode.