I have several 280X's mining and I agree with what the others have posted, lower your core as it only adds more heat and power consumption, 1000 is even fine, also lower your memclock to 1500. I played with tons of settings and they only make the most minute differences in hash-rate, so you are better off saving on the power consumption.
As far as the hash-rate. yes with the increasing size of the difficulty/DAG file, 20.3 MHash is pretty average. I am getting ~ 21 MHash per 280X right now, down from 25-26 MHash about a month or two back.
Topic: 280x Toxic ethereum low hashrate. (Read 2985 times)
Your Core frequency is quite high. There is no need for that to be too high, it is fine with 1050 MHz.
youre in the expected 18-22MH range. my understanding is the benchmarks are based on a 1GB DAG file, rather than the ~1.3GB it actually is now
I think you need to reduce the memory frequency to 1500 MHz. For Ethereum mining, 1500MHz is fast than the 1600MHz.
Hi everyone 
I bought a 280x Toxic and i'm going to get it working properly.
I wanted to mine some ethers but unsuccesfully I'm not getting the hoped hashrate..
No overclock or underclock the gpu pulls just 20.3MHS pooled mining and 26.5MHS in benchmark mode.
I tried ubuntu 14.04 fglrx 15.20 (ccc 15.7) but the same thing, 20.3MHS. I took some photos to gpuz, I think the problem is the psu (cooler master 650W http://www.newegg.com/Product/Product.aspx?Item=N82E16817171014) because in full load it takes just 180W as shown by gpuz.
Any help will be very appreciated
https://15254b2dcaab7f5478ab-24461f391e20b7336331d5789078af53.ssl.cf1.rackcdn.com/ethereum.vanillaforums.com/editor/58/eru5b22af329.png
Benching
https://15254b2dcaab7f5478ab-24461f391e20b7336331d5789078af53.ssl.cf1.rackcdn.com/ethereum.vanillaforums.com/editor/nv/aztavbp7dfgj.png
I bought a 280x Toxic and i'm going to get it working properly.
I wanted to mine some ethers but unsuccesfully I'm not getting the hoped hashrate..
No overclock or underclock the gpu pulls just 20.3MHS pooled mining and 26.5MHS in benchmark mode.
I tried ubuntu 14.04 fglrx 15.20 (ccc 15.7) but the same thing, 20.3MHS. I took some photos to gpuz, I think the problem is the psu (cooler master 650W http://www.newegg.com/Product/Product.aspx?Item=N82E16817171014) because in full load it takes just 180W as shown by gpuz.
Any help will be very appreciated
https://15254b2dcaab7f5478ab-24461f391e20b7336331d5789078af53.ssl.cf1.rackcdn.com/ethereum.vanillaforums.com/editor/58/eru5b22af329.png
Benching
https://15254b2dcaab7f5478ab-24461f391e20b7336331d5789078af53.ssl.cf1.rackcdn.com/ethereum.vanillaforums.com/editor/nv/aztavbp7dfgj.png
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