Pour the water and the macaroni into your instant pot.
Add the salt and butter piece and stir.
Cook the pasta on manual for 4 minutes.
When the timer goes off, do a manual quick release.
When the pressure is done, set the pot to saute.
Add the whipping cream while stirring the noodles.
Add the cheese half a cup at a time and stirring until melted after each one.
After the cheese is all melted, add your diced ham.
If your ham is cold, allow the ingredients to saute together for a few minutes until the ham warms up.
If the ham is already warm you can serve it immediately.