I can think of two possible reasons:


* One, the M92p uses an x64 CPU architecture, while the Pi uses an ARM CPU. CISC processors use more power, but are much faster for some applications than RISC processors. I believe there have been some optimizations for ARM recently for Bitcoin Core, but I don't know how much of a difference it makes.

* Two, there are quite a few reads and writes to the hard drive during the synchronization. I would guess that your Pi's hard drive is connected via USB, while the hard drive in the M92p is connected via SATA.