Sam pretty much covered the 1TH/s speeds.  As for the Raspberry Pi it really depends on which one you are using.  I have not tested a Raspberry Pi 4 yet (I receive a 2gb ram version this coming Tuesday 7/30/19 so will be testing soon) however the Raspberry Pi 3 b+ and older units, the gigabyte lan and USB ports all share the same (one) USB Bus.  Which really limits what you can do with the Pi 3 b+ etc.   I was running 4 Newpacs and 2 R606 on a Pi 3 b+ and the R606 no matter the Mhz and voltage they would not go over 500 - 550 Mhz if I was lucky.  The system would detune and average about 650 to 750 Gh/s each.  Switching to a dedicated desktop running Linux Mint (just another flavor of ubuntu) and from here I have been able to maintain average speeds of about 900 - 950 Gh/s each.

I do not know why the Pi developers decided to make the Pi 3 and Pi 3b+ all run off one usb Bus.  As it becomes a huge bottleneck when you have more devices being used.    I originally ordered a Odroid XU4 to replace my Pi 3 b+ however UPS lost my package, so got a refund and picked up the Pi 4 to tinker with instead.  I have 2 test projects I am wanting to run on the Pi 4.  1st running these miners as I would like something that uses little wattage and can control the miners, as my Linux box is a power hungry FX-8350.  I'm wanting to set this box aside to running Handbrake on media files and use 3D apps to design models for 3D Printing projects.   2nd test project is as a NAS.  I'm now using my Raspberry Pi 3 b+ as a small NAS unit with 1TB of total space.   Does ok but transfer rates on the network is hitting 12 - 18 MB/s.  Again another weak link of the Pi 3 series.   So wanting to test the transfer rates out on the Pi 4 since it's now using 3.0 USB ports and also use multiple buses now, no longer combining all usb ports and networking to one bus.

Fun times.

---

Update.  For those new to linux, please take some time to look over some free courses from Udemy.  I use this site extensively for both paid and free content.  I'm a programmer on IBM I series / Power 9 (running os/400) machines and always love expanding my knowledge in Tech.  This site is a pretty useful tool.  And there are also courses in regards to the Block chain, bitcoin etc.  So not really and AD for Udemy, however they help me out quite a bit so passing on the knowledge.

Link for Udemy Search of free Linux online courses:  https://www.udemy.com/courses/search/?src=ukw&q=linux%20for%20beginners&p=1&price=price-free.