IDK, but for comparison, look:
pi@xu4:~$ sudo dd if=/dev/zero of=/dev/ram0 bs=1k count=4000
[sudo] password for pi:
4000+0 records in
4000+0 records out
4096000 bytes (4.1 MB) copied, 0.0402256 s, 102 MB/s
pi@bananapi:~$ sudo dd if=/dev/zero of=/dev/ram0 bs=1k count=4000
[sudo] password for pi:
4000+0 records in
4000+0 records out
4096000 bytes (4.1 MB) copied, 0.0706718 s, 58.0 MB/s
pi@odroidc1:~$ sudo dd if=/dev/zero of=/dev/ram0 bs=1k count=4000
[sudo] password for pi:
4000+0 records in
4000+0 records out
4096000 bytes (4.1 MB) copied, 0.0324672 s, 126 MB/s
pi@orangepipc:~$ sudo dd if=/dev/zero of=/dev/ram0 bs=1k count=4000
[sudo] password for pi:
4000+0 records in
4000+0 records out
4096000 bytes (4.1 MB) copied, 0.0309904 s, 132 MB/s