2 gridseed questions related to scrypt only hashing:

1) What is the maximum people have clocked the 5 chip gridseeds up to with acceptable results?
I normally run mine at 900 (381K)  although they appear to run at 950 (402K/s) with few hardware errors (at least in my limited testing).
At 975 they do about 412/413K.
At 1000 they do 423K.

2) What is an "acceptable" amount of hardware errors?   1 a minute?  5? 10?

3) Is there a way with cgminer to specify a frequency for each specific gridseed without using a separate instance of cgminer?

[edit:  I see now with this version of cgminer you can specify per device speeds:  https://github.com/girnyau/cgminer-gc3355, for example
--gridseed-options freq=888 --gridseed-freq 8D74488A4949=900,8D96227B5449=900,8D7357785355=875
I found this on an earlier post by Girhes ]


I'm using cgminer.