Powercolor r9 280x good for mining?

[Hannan]

Hi
Just wonder are these cards good for mining?
any idea?

Thanks

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[crazyates]

We have a bunch of the Powercolor 290 cards. They use the Elpida ram, and don't really go much higher than 800.

For 280x, stick with good brands: Sapphire, Gigabyte, Asus, or MSI.

[pf22100]

I just finished a rig with 4 running on a 860watt PS.  I've undervolted them and use SGMINER on windows 8.1.  Getting 725-730 hash rate.  Two are Elpida and two are Hynix memory.  Just trying to figure out why one tends to go sick.  Might tweak the voltage up a bit, or take a card out and see if it still persists.  Otherwise, they seem ok, but I've only had them for under 2 weeks.

[aj178]

new bee here, I just purchased 280x with bios 015.040.000.003.000000

windows7 professional 64bit. 13.12 catalyst and 2.9 sdk. sgminer4.0 can only generate 640-660khs pointing to [Suspicious link removed]

"api-listen" : true,
"expiry" : "120",
"failover-only" : true,
"log" : "5",
"queue" : "1",
"scan-time" : "60",
"scrypt" : true,
"auto-fan" : true,
"gpu-threads" : "2",
"gpu-engine" : "1020,1025",
"gpu-memclock" : "1500,1500",
"gpu-powertune" : "0,10",
"intensity" : "13",
"temp-target" : "75",
"temp-overheat" : "82",
"temp-cutoff" : "87",
"temp-hysteresis" : "3",
"vectors" : "1",
"worksize" : "256",
"lookup-gap" : "2",
"shaders" : "2048",
"thread-concurrency" : "8191"

gpuz showing temp 79-82, gpu load 94-96%, vddc 1.15-1.17