Overview

Below are some benchmarks comparing the PiSCSI running on different variants of Raspberry Pi's, along with the SCSI2SD version 5 and an original Apple hard drive as a comparison.

Test results

Overall Disk scores

images/benchmark_overall.png

Some notes on this:

There are multiple SCSI2SD scores. I ran the test on two different volumes on the SCSI2SD and got slightly different scores.
I suspect that the Pi 0 got higher scores because the PiSCSI software only uses one core. This gives the Pi 0 a slight clock speed advantage

Disk Read Scores

images/benchmark_read.png

Disk Write scores

images/benchmark_write.png

Test setups

Common components

Macintosh Quadra 840av

68040 Processor at 40MHz
128MB RAM
1MB VRAM
Seagate ST3600N 500MB HD w/stock Apple firmware
MacOS 8.1
Drive cache configured at 128KB
Norton System Info 3.5 Part of Norton Utilities

PiSCSI - Raspberry Pi 4

1.5GHz ARM Cortex-A72 - Quad core
4GB RAM
Samsung 32GB EVO Plus SD Card
Raspberry Pi OS - 2020-05-27-raspios-buster-full-armhf
PiSCSI - piscsi version 1.5

PiSCSI - Raspbery Pi 2

900MHz ARM Cortex 7 - Quad core
1GB RAM
Samsung 32GB EVO Plus SD Card
Raspberry Pi OS - 2020-05-27-raspios-buster-full-armhf
PiSCSI - piscsi version 1.5

PiSCSI - Raspberry Pi Zero

1GHz ARM11 - Single core
512MB RAM
Samsung 32GB EVO Plus SD Card
Raspberry Pi OS - 2020-05-27-raspios-buster-full-armhf
PiSCSI - piscsi version 1.5

SCSI2SD

Version v5.0a -
Firmware version 4.8.04
Samsung 32GB EVO Plus SD Card

Other benchmark datapoints

erichelgeson ran SCSI2SD v6 on a PowerMac G3 with Norton version 5 and received a score of 247. This high score was probably influenced by a much faster computer than a Quadra 840av, which was used on the other tests. But, its also likely that the SCSI2SD v6 also has a lot better performance.