>Since the only purpose of the refresh circuitry is to avoid the
>memory dropping bits, it should already be running at the slowest
>possible rate, and speed reduction will be harmful, while speed
>increase will do no good. So this is not a good idea.
>
>What are you trying to do?

Although it's not expressed in DRAM specs and you wouldn't want to
rely on it, the effect of reducing refresh rate is to increase the
access time. I'm not up-to-date with DRAM technology, but my
experience with devices 30 years ago was that you could turn off
refresh (and all other access) for 10s or more without losing the
contents, provided you weren't pushing the device to its access time
limits.

So, it's not impossible that reducing refresh rate would have a use
(albeit outside the published device spec). But, as you suggest, it
would help if he would just tell us what he's trying to do.

Mike