i have 2 of those kfa2 1070 ex overclocked them to +190 core and +740 mem clock and 85% powerlimit getting around 480 to 500 soll in zec and about 30,5 mhs ethereum in dualmining with sia dcri set to 60 no impact on ethash... its a good card for the price its 100€ cheaper here than a 1070 from msi gigabyte and so on ... only contra is 1 8 pin + 1 6pin power connector so if you build a rig be sure to have enough pcie power connectors i also so have some gigabyte 7x 1070 2 fan oc version this card has only 1 8 pin connector and does almost the same hashrate than kfa2 1070 ex with same overclocking... sorry 4 bad english

I'm a little confused by your wording.

Did you try each board one at a time to determine which one is not working?

Did you try each data port with that board to determine it is the board and not the port it is plugged into?

Did you try using a different cable to determine if it is the cable?

If you have determined that after the above it is the board and you are still under warranty then you should be able to get it repaired. You could also possibly get it repaired if not under warranty, but it will cost you.

in that case, you may want to test 1 hash PCB at a time, to identity which PCB will hash and which one does not.  1 hash PCB connected to the control module at a time

Hope this can help you find which one is bad


@BitmainWarranty,

I have tried to do this before and figure it out which one PCB that facing the trouble and doesn't work (I uploaded a pic of PCB below and marked it with a red circle and arrows)

the question here what I should do to fix it ?

If your control PCB has 4 data port, please try using 1 unused port to connect to hash PCB that does not have red LED flashing near the PCI-E power plug when the miner is hashing.

Other wise, if you can take a look at the hash PCB when the S9 is mining, you may notice one of the hash PCB does not have the little red LED on or flashing.  (That is the PCB in trouble here)



Hi BitmainWarranty,

all of them having red LED flashing when the miner is hashing , even the PCB that facing the trouble and doesn't Appears on Miner Status Page