Thanks for your response Brink.
I perhaps should have clarified that I'm fully familiar with the concept of partition types, being an experienced IT professional. It was just that I wasn't previously aware of the allocation of type 84h specifically for use as a hibernation partition.
Normally, hiberfil.sys is saved in the root directory of the C: drive, which is usually an NTFS partition with type 07h.
The existence of an entirely separate partition type specifically for hibernation suggests that Windows might be able to use it as a raw partition (with no filesystem, NTFS or otherwise) for saving the RAM dump.
I'm wondering if I can shrink my main NTFS C: partition by an amount equivalent to the RAM I have fitted, then create a type 84h partition in the freed up space, then tell Windows to use it for hibernation instead of saving a hiberfil.sys file in C:.