This is mostly for myself in the future. Memory speeds required to run at 0 wait states at different frequencies:
| CPU frequency in MHz | Memory speed in ns |
|---|---|
| 4.77 | 200 |
| 6 | 150 |
| 8 | 120 |
| 10 | 100 |
| 12.5 | 80 |
| 16 | 60 |
This information is taken from a forum post. There is also a Wait states calculator