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I have two Gigabyte R9 280x OC rev 2.0 on an MSI Z77A, runing cgmine 3.7.2 with:
-g 2 -w 256 -I 13 --lookup-gap 2 --thread-concurrency 8192 --shaders 2048
Without overclock, and without any kind of risers.
My best results it was getting one of them pushing up to ~750k hashs (other on ~700k hashs).
I already make some tests and the results got a bit wierd.
- Tried to switch power supply cables from on to another, and didnt make any diference.
- When i connect them both on slot 0 (near cpu) and slot 2 (out side), i get these:
slot 0 :: gpu 0
slot 2 :: gpu 1
- When i switch them, i get the same results, on slot 0 i get the highest result, slot 2 lowest.
- I tried to connect them individualy, on slot 0, 1 and 2, and i didnt get higher that 700k hashs.
I dont know if i am having a problem with drivers since i dont have the latest installed:
Latest driver:
Display Driver ver. 13.251
OpenCL(tm) Driver ver. 10.0.1348.5
Catalyst Control Center ver. 2013.1206.1602.28764
I dont have the computer near me to try, so i wrote these topic to know if anyone of you had a similar problem and how did you solved.
