Normal
It would be worse than a delid with paste. For delidding you should stick to paste or liquid metal. Current graphite pads don't really offer any thermal improvements - just convenience and a reusable thermal interface material.When trying to apply a sheet across the whole IHS in a delid you have two issues:First, thermal transfer is mostly going to be limited by the transfer on the z axis directly from the die, so the extra lateral transfer won't help too much.Second, in order to get good thermal conductivity the graphite pads need a pretty good amount of pressure on them. If you wanted to get decent thermal transfer to the rest of the IHS away from the die, you would need a hard surface around the die that is level with the die. Higher than the die and you lose contact with the die, lower than the die and you don't get any meaningful thermal transfer because of no pressure. An insulating pad would be too soft. Getting a spacer built just right would be a lot of work.
It would be worse than a delid with paste. For delidding you should stick to paste or liquid metal. Current graphite pads don't really offer any thermal improvements - just convenience and a reusable thermal interface material.
When trying to apply a sheet across the whole IHS in a delid you have two issues:
First, thermal transfer is mostly going to be limited by the transfer on the z axis directly from the die, so the extra lateral transfer won't help too much.
Second, in order to get good thermal conductivity the graphite pads need a pretty good amount of pressure on them. If you wanted to get decent thermal transfer to the rest of the IHS away from the die, you would need a hard surface around the die that is level with the die. Higher than the die and you lose contact with the die, lower than the die and you don't get any meaningful thermal transfer because of no pressure. An insulating pad would be too soft. Getting a spacer built just right would be a lot of work.
