Many thanks integrale.  You are a gentleman and a scholar.  The problem is one of power supply. I independantly wired each power cable to 12v supply and that has cured it... they are still set at 850mhz. Hashrate all boards around 2.4mh/s I will change to 700mhz and see if any difference....

anybody help please?

Hi, folks, tried to sort this out myself but no joy...
I have 4x gridseed blades using bfgminer, linked by a 7port usb hub on windows 64bit laptop.  It to only mines from one gridseed and I have tried different hubs, laptops and bfg versions and all though all the gridseeds register on bfg, it only mines from one of them.  They are all working and I've tried different ports and different units yet only mines from one of them. See enclosed picture.
bfgminer.exe --scrypt -o stratum+tcp://litecoinpool.org:3333 -u xxxxx.1 -p 1 -d gridseed -S gridseed:all --set device-options=baud=115200,freq=850,chips=40,hotplug=5

Is it a windows problem?



This is freaking me out.. TIA