After hours i found reason why some 280x (my Vaporx too) have low hashrate.
Reason was: combination a different card in one rig with eror scrypt configuration.
My working configuration below for combination 270s and 280x.
What was a problem ? PARTIALLY LOADED CONFIG
many config using this one in "gpu-threads" : "2,2,1,1", but this isnt work in combination different card. Configuration failed in loading miner and is only partialy loaded.
You must use only: "gpu-threads" : "2" or "gpu-threads" : "1" and for other card you must found working configuration in TC (for example best configuration for R9 270 is with "gpu-threads" : "1", but combination with 280x wont be work correct).
My advice: - if you have combination of different card dont use gpu-threads" : 2,2,1,... did not work.
Imho this is a solution for many trouble with really low hashrate in any other coin.
280,280,270,270 (130,130,69,69 khash/s) or with Intensity - 12 for 270, but with some HW (130,130,85,85 khash/s)
,
"scrypt-jane" : true,
"sj-nfmin" : "4",
"sj-nfmax" : "30",
"sj-time" : "1388361600",
"api-listen" : true,
"auto-fan" : true,
"failover-only" : true,
"gpu-fan" : "30-85",
"gpu-threads" : "2",
"intensity" : "12,12,11,11",
"gpu-engine" : "1050,1050,1000,1000",
"gpu-memclock" : "1500,1500,1250,1250",
"gpu-powertune" : "20,20,20,20",
"kernel" : "scrypt-jane",
"kernel-path" : "/usr/local/bin",
"no-pool-disable" : true,
"temp-cutoff" : "84",
"temp-hysteresis" : "3",
"temp-target" : "72",
"worksize" : "256",
"thread-concurrency" : "16384,16384,11265,11265",
"lookup-gap": "2",
"queue" : "0",
"scan-time" : "1",
}
Power consuption for complet rig is 665 W (280x - v 1.087, 270 - v 1.1)
Yet i am looking for 270 better combination gpu-thread 2 + TC + Intensity 12. for avg. hashrate above 85 khash/s
