Topic: mixed GPU low hashrate issues with cgminer (Read 1129 times)
Thank you very much for the reply. I'll give that a shot and see if that helps.
I have seen this and for me the solution was to run a separate instance of cgminer for each card then I can get each card running at its best.
Hello all. I finally registered after finding I almost always end up back here when trying to find an answer to a mining question. So far I've not found a good answer for a couple issues I'm having with a 'rig' I've thrown together with old radeon cards I've accumulated. I mainly mine scrypt altcoins(litecoin) if that makes a difference.
I currently have 2 'rig's running. My main PC with a 5830 which averages just under 300Kh/s which from the mining hardware guide is what I expect.
The rig I'm having an issue with has a 5750 and a 5770 in it. I had previously run the 5770 in my main PC until I got the 5830. When running in my main PC I was able to get just under 200Kh/s a V 0.958 with it clocked at 850/1200 which I would expect based on the hardware guide. The 5750 I got used for $9 about the same time I got the 5830 so while the 5830 replaced the 5770 in my min PC I decided to put one of my old desktop back into service as a miner until I can accumulate enough BTC to purchase some newer/better hardware. Outside of some minor issues I had with xubuntu 12.10 (after installing xubuntu and the graphics card drivers the keyboard/mouse no longer work which is fine since I just ssh to the box) I was able to get everything setup and hashing using cgminer. My problem is that the 5750 and the 5770 both hash at ~115Kh/s each for ~230Kh/s total. That hashrate for the 5750 is probably fine but the 5770 is way low based on my previous usage of the card with guiminer on windows. The other thing I noticed is that the 5770 used to run about 70C at 100% fans while now it runs at 57C at 85% fans which leads me to believe it's very underused for some reason(activity shows 99% in cgminer). While I've been running a mining program of some sort for a month or so now I'm very much a newbie to trying to figure out optimal settings. I'm sure this is something stupid as both cards seem to hash at exactly the same rate instead of one fast and one slower which is what I expected to see.
My setup:
xubuntu 12.10 USB install
MB: supermicro h8smi-2
CPU: Operton 1222
Ram: 4x2G modules
GPU's: Asus 5750, Dell 5770 reference cooler
cgminer settings:
cgminer --scrypt -I 20 --thread-concurrency 3200 -o stratum+tcp://
cgminer.conf:
"intensity" : "20,20",
"vectors" : "1,1",
"worksize" : "256,256",
"kernel" : "scrypt,scrypt",
"lookup-gap" : "0,0",
"thread-concurrency" : "3200,3200",
"shaders" : "0,0",
"gpu-engine" : "0-0,0-0",
"gpu-fan" : "0-85,0-85",
"gpu-memclock" : "0,0",
"gpu-memdiff" : "0,0",
"gpu-powertune" : "0,0",
"gpu-vddc" : "1.000,1.000",
"temp-cutoff" : "85,85",
"temp-overheat" : "75,75",
"temp-target" : "65,65",
"api-port" : "4028",
"expiry" : "120",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "60",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}
Any help for a newbie would be greatly appreciated so I can improve my mining performance and hopefully get an actual mining rig someday! Thanks in advance.
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