What is the difference between Gridseed ASIC and Scrypt ASIC
Gridseeds are small dual-mode miners offering SHA256 and Scrypt.



Gridseeds have a very low scrypt hashrate (&lt;400kH/s). The hashrate affects the share difficulty and therefore it's quite a good idea to offer a seperate mining port for low hashrate devices.

It seems there are so many gridseeds still out there that it's worth to mention that on the pools help page.