Sorry to bump an old thread, but is there any update on motherboards that can support 6 gpu?  I recently tried the 5 pcie asrock H170A-X1 and it only supports 4 gpu's

Thanks in advance (USA)

One more strange question for anyone out there.  I've tweaked my OC settings (I have 4 identical Sapphire 470 nitro 4GB) 3 are now running 300-305 H/s and GPU3 is running 205-220 H/s.  I am at a loss why this one is so much slower???

Any help is appreciated.

Benzo, 1120 on which clock?  Mem or GPU?

benz0, I am using Sapphire Trixx 3.0 for adjusting. 

So, I went with this so far: 
Original:  GPU Clock:  1236, Memory Clock: 1750, mV +0
Adjustment #1:  GPU Clock 1350, Memory Clock 1900, mV -6

-asm 0 slowed me down
-asm 1 no change
Trying -asm 2 now

One thing I noticed is temps dropped from 73 to 67

Please advise...  I am not mining with CPU, only GPU

For the Claymore Miner v 12.4 using 4 Sapphire RX470 Nitro 4GB, I am using this bat: 

ZECMiner64.exe -zpool ssl://zec.supernova.cc:2242 -zwal username.worker -zpsw password -i 7

Im only getting about .15 zcash every 25-26 hours

What can I do to improve performance?  Miner speeds read 276 - 288, Driver date 3-16-17 version 21.19.525.258.