Hi all, well I decided to join the bandwagon and get mining (mainly doge just for fun
)
I bought an XFX R9 280x, but seem to be having some really odd issues with it.
I hope it's OK, but since I'm restricted to this forum, I need a bit of help, I've been messing with this for 2 days and got nowhere.
Basically, my hashrates are bad. And not 690Kh from 700KH bad, but I can't even hit 600KH, no matter what I do.
In a nutshell, my setup is a single 280x, with an i3 something (2x 3.4Ghz), 8GB DDR3 RAM and a Antec 620W PSU on a B75M-D3H mobo, running Catalyst 13.9. I am running 2 monitors off the card, but disconnecting them makes basically no difference.
First, I tried all stock settings, 1000Mhz core, 1500 mem clocks, and simply set cgminer (version 3.7.2) to I 13 and let it figure out the rest. Result was about 540KH.
Next I tried setting shaders to 2048, result was about the same. Then I tried walking up the memory clock until it crashed, which was somewhere over 1700Mhz. Rebooted, dropped it down a bit and started walking up the core clock. Hashrate would climb about 4KH with each 5Mhz added, but I never got past about 1100Mhz before crashing, which gave ~550KH.
Did a bunch of googling, trying other peoples settings for the 280x, still can't break 600KH.
Changed -g 2 to -g 1, hashrate increased by about 40KH (wtf, literally EVERYONE else with a 280x uses -g 2??)
Next I tried leaving mem clock stock at 1500 and walking up the core clock. With thread concurrency at 8192, g 1, and clocks at 1080/1500, I've hit 560KH. This is the best I've ever seen it.
My bat file has
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
in it before the cgminer call.
As a last resort, I tried ramping up the voltage bit by bit, but it wasn't having enough of an effect to make it worth the risk, and no one else has done it apparently, and are getting 700KH+. Temps are all fine at around 60C.
Now for the odd part, no matter what I do, the intensity will NEVER go above 13. If I go above 13, I get hardware errors, or at the best a drop in hashrate.
I have a suspicion something is going on with the GPU allocation however, and here's why:
I also have a 4890 I was using to mine previously, and when that was running at it's full capacity, my desktop was pretty slow and jittery. The 280x, not so much. Hell, I can run furmark at 28FPS AT THE SAME TIME, and don't even get a drop in hashrate.
If I change -g to 2, and set the intensity up, then I start getting a bit of jitter, however the hashrates are still horrible, usually only getting to ~510KH, and also hardware errors.
I've run out of ideas, I have NO idea what's going on. I've had to have tried at leas 30 different config examples from other people running 280x's, and I've never seen it over 600KH, ever.
Please help
Sorry for the long, whiny post. Just don't like spending $380 on a card to find it's under performing by almost half.
Dan
