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The original PDP-11/70 was 0.7 vax mips. So it was 70% as fast as a Vax 11/780. I believe (from memory) the Vax 11/780 could do ~1757 dhrystone 2.1 mips so a PDP-11/70 would be about 1230 dhrystone mips. https://wiki.cdot.senecacollege.ca/wiki/Dhrystone_howto

Indeed, back in the day we bolted QBus backplanes to the side of DIN41612 backplanes and wire-wrapped across to a bunch of boards each with 100+ TTL chips on them (the 5V PSUs were something like 120A). The bus clocked at around a MHz, hence loosely the instruction rate (and back then, the addressed memory or peripheral needed to ack the bus cycle or there'd be a bus fault).

50 cent ESP-8266 would make excellent PDP-11. Except much too much memory. And 20 times too fast.

https://www.espressif.com/en/news/news/ESP32-Powered_PDP-11