2x R9 280x = @286 KH/s

[N[e]wBie]

Hello, there are no i nstructions for cgminer AFAIK. I have been trying for many hours to get this to work. Sometimes, with these same settings, I will get up to 680 Kh/s, but its never working on both GPUs. How can I get them to both work?
-d 0 -I 13 -g 2 -w 256 --compact  these settings before were giving me 680k/hs, I took out the "-d 0" and then I got a driver crash right away, and when I restart this, it gives me 289.5 K. The GPU 1 is not showing at all.

Thanks very much for any help!

[vm1990]

change to guiminer scrpyt alpha (its on here just do a google) and uping the intensity -I will give you bettter hashrate but will lower desktop performance
options are
12
13
14

16
17
18
19

[Number6]

Make a new empty text file in notepad named cgminer.conf, make sure it saves as .conf and not .txt, and save it in the same directory as your cgminer.

Copy/Paste the below into the file and save and then relaunch cgminer. You will not need to use your launch string, just launch cgminer on its own, it will read the values in from the new config file. Also be sure to delete any old .bin files that may be in the directory.

Code:

{
"pools" : [
	{
		"url" : "stratum+tcp://us.litecoinpool.org:3333",
		"user" : "Miner.Username",
		"pass" : "Password"
	}
]
,
"intensity" : "13,13",
"vectors" : "1,1",
"worksize" : "256,256",
"kernel" : "scrypt,scrypt",
"lookup-gap" : "2,2",
"thread-concurrency" : "8192,8192",
"shaders" : "0,0",
"gpu-engine" : "1025,1025",
"gpu-fan" : "0-85,0-85",
"gpu-memclock" : "1250,1250",
"gpu-memdiff" : "0,0",
"gpu-powertune" : "0,0",
"gpu-vddc" : "0.000,0.000",
"temp-cutoff" : "95,95",
"temp-overheat" : "85,85",
"temp-target" : "75,75",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"failover-only" : true,
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "2",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}

Change the pool information to the pool you are using of course. Also the gpu-engine and gpu-memclock lines are for setting your gpu speeds, I place lower values in this config that should get you into 700 kHash easy, you can experiment changing these on your own in cgminer once everything is up and running properly.

[pindis]

change to guiminer scrpyt alpha (its on here just do a google) and uping the intensity -I will give you bettter hashrate but will lower desktop performance
options are
12
13
14

16
17
18
19

Don't up the intensity on the 280x. It just plain simply does not work.

[MisO69]

I have these and they give me 740Kh/s each. Constantly and very reliably with this config:

--scrypt --lookup-gap 2 --thread-concurrency 11200 -g 2 -I 13 -w 256 --auto-fan --gpu-fan 30-75 --temp-cutoff 90 --temp-overheat 85 --temp-target 72 --gpu-memclock 1500 --gpu-engine 1080 --gpu-powertune -20 --expiry 1 --scan-time 1 --queue 0 --no-submit-stale

[N[e]wBie]

Make a new empty text file in notepad named cgminer.conf, make sure it saves as .conf and not .txt, and save it in the same directory as your cgminer.

Copy/Paste the below into the file and save and then relaunch cgminer. You will not need to use your launch string, just launch cgminer on its own, it will read the values in from the new config file. Also be sure to delete any old .bin files that may be in the directory.

Code:

{
"pools" : [
	{
		"url" : "stratum+tcp://us.litecoinpool.org:3333",
		"user" : "Miner.Username",
		"pass" : "Password"
	}
]
,
"intensity" : "13,13",
"vectors" : "1,1",
"worksize" : "256,256",
"kernel" : "scrypt,scrypt",
"lookup-gap" : "2,2",
"thread-concurrency" : "8192,8192",
"shaders" : "0,0",
"gpu-engine" : "1025,1025",
"gpu-fan" : "0-85,0-85",
"gpu-memclock" : "1250,1250",
"gpu-memdiff" : "0,0",
"gpu-powertune" : "0,0",
"gpu-vddc" : "0.000,0.000",
"temp-cutoff" : "95,95",
"temp-overheat" : "85,85",
"temp-target" : "75,75",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"failover-only" : true,
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "2",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}

Change the pool information to the pool you are using of course. Also the gpu-engine and gpu-memclock lines are for setting your gpu speeds, I place lower values in this config that should get you into 700 kHash easy, you can experiment changing these on your own in cgminer once everything is up and running properly.

I did this, and I am getting 508.8kh/s with these settings combined, 241/283 per card.
I have briefly gotten up to 1.3 MH/s but then it was crashing with these settings;

"scrypt" : true, "intensity" : "13,13", "gpu-engine" : "1020,1050", "gpu-fan" : "0-85,0-85", "gpu-memclock" : "1500,1500", "gpu-powertune" : "10,10", "temp-cutoff" : "95,95", "temp-overheat" : "85,85", "temp-target" : "75,75", "thread-concurrency" : "11200,11200", "auto-fan" : true, "auto-gpu" : true, "expiry" : "120", "failover-only" : true, "lookup-gap" : "2,2", "gpu-threads" : "2", "log" : "5", "queue" : "1", "scan-time" : "60", "temp-hysteresis" : "3",
"kernel-path" : "/usr/local/bin" }

[Sephira]

I have a pair of these cards and get at least 700 each out of them.

I just looked on the LTC mining hardware comparison list, found the closest model to my 280x and used the cgminer code from there. Have a look (c:

[N[e]wBie]

I have been trying those settings for hours over the last few days, sometimes I do get up to a good speed, but its never been stable for >24 hours without a crash. Right now, with Miso69 settings, I am getting 591 KH/s with Sapphire and 718 with GB.
This is about the best I have gotten, if it remains stable I will be happy, although 591 seems a tad low for the Sapphire card.