Hello everybody,
BOUNTY FOR SOLUTION: .02 BTC
I'm writing because I have 5 rigs. The specs are below:
6x r9 270 GIGABYTE GV-R927OC-2GD
Celeron G1620
3 Powered Risers, 3 Unpowered
MSI Z77A-GD65
4GB RAM
32GB SSD
2x EVGA Supernova 750 Watt Power Bronze Certified Power Supply (Daisychained)
Windows 8.1
So here's my issue:
On one of the rigs, I've been able to get 6 of the cards running at about 2.858MH/S. That's about 475-477 KH/s per card on that rig.
The hardware setups for these rigs are absolutely identical in every way.
However, on the rest of the 5 rigs, the rigs crash if I use the exact same settings I'm using for the one rig... The graphics will either become completely unstable, or the rig will freeze, or a GPU in the rig will go sick/dead. I can't use the same settings I use on the one rig in the other rigs to get that nice high 475KH/s rate.
I'm worried that maybe I changed something in the software on Windows that gives me these rates on the one system but I didn't do it on all the others; can't figure out what they might be though.
The settings I'm using for the hashrate that's working on the one rig are as follows:
"api-listen" : true,
"intensity" : "19",
"vectors" : "1",
"worksize" : "256",
"kernel" : "scrypt",
"auto-fan" : true,
"temp-cutoff" : "80",
"temp-overheat" : "79",
"temp-target" : "70",
"expiry" : "30",
"gpu-dyninterval" : "7",
"log" : "5",
"queue" : "1",
"retry-pause" : "5",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"shaders" : "1792",
"thread-concurrency" : "15508",
"gpu-thread" : "1",
"gpu-engine" : "1120",
"sharethreads" : "32",
"lookup-gap" : "2",
"gpu-powertune" : "20",
"gpu-memclock" : "1500"
Why does this work on one rig and not the others?
![Huh](https://bitcointalk.org/Smileys/default/huh.gif)
They start out fine and then crash, while this one stays stable!
Solution must work in Windows 8.1 and give a relatively similar hashrate to qualify for bounty.
I can also do Teamviewer for diagnosis.