I am new to mining and wanted to ask a few questions.
1) I bought two second hand XFX HD 7950 (FX-795a-tn) and I am trying to build my rig to mine altcoins. I am testing with one card only to see if everything works well.
This is my cgminer.conf
Code:
{
"pools" : [
{
"url" : "xxxxxxxxxxxxxxxxxxxxx",
"user" : "xxxxxxxxxxxxxxxxxxxxx",
"pass" : "1"
}
],
"kernel" : "scrypt",
"scrypt" : true,
"no-submit-stale" : true,
"temp-overheat" : "80",
"temp-cutoff" : "90",
"temp-target" : "70",
"intensity" : "20",
"vectors" : "1",
"worksize" : "256",
"gpu-fan" : "auto",
"gpu-powertune" : "20",
"thread-concurrency" : "24000",
"gpu-threads" : "1",
"expiry" : "120",
"no-pool-disable" : true,
"log" : "5",
"shares" : "0",
"queue" : "1",
"scan-time" : "60",
"temp-hysteresis" : "3"
}
"pools" : [
{
"url" : "xxxxxxxxxxxxxxxxxxxxx",
"user" : "xxxxxxxxxxxxxxxxxxxxx",
"pass" : "1"
}
],
"kernel" : "scrypt",
"scrypt" : true,
"no-submit-stale" : true,
"temp-overheat" : "80",
"temp-cutoff" : "90",
"temp-target" : "70",
"intensity" : "20",
"vectors" : "1",
"worksize" : "256",
"gpu-fan" : "auto",
"gpu-powertune" : "20",
"thread-concurrency" : "24000",
"gpu-threads" : "1",
"expiry" : "120",
"no-pool-disable" : true,
"log" : "5",
"shares" : "0",
"queue" : "1",
"scan-time" : "60",
"temp-hysteresis" : "3"
}
With this configuration sometimes I open cgminer and it mine at 600khs avg and sometimes at 550khs avg. I do not know why because I don't change anything.
Is this configuration ok??
2) Temperature when mining gets up to 84º C and I wanted to undervolt to get it down a bit. But this card cannot be undervolted via trixx, afterfurner or gpu tweaker. The only possible way is via bios modification, but this card do not have the bios recovery switch and also has a checksum. That is why I am afraid of doing it, I don't want to brick the card...
Should I take the risk and try to modify the bios?? Did someone here did it succesfully on a similar card??