As in when your secondary memory is fast enough, after the first 10% of the model are processed you can swap their memory with the part for 50% to 60% and when that is done you swap back to have the 0-10% ready in time for the next iteration?

Sounds ambitious, for the small improvement in effective capacity. In particular when I start wondering if real life speed differences would be small enough for that 10% increase, or if it would be even smaller. And that's before factoring in power/cooling cost for saturating another interface.