iMAC with AMD Radeon R9 M295X 4096 MB only 2,3 - 2,8 MH/s

[nerle]

Hi, reading about 40MH/s possible with AMD Radeon R9 M295X 4096 MB so I gave my iMac an try and installed ethminer. With ethminer 0.10 I get around 2,3-2,8 MH/s (and I could work with iMac).

With etminer 0.12 I get some 1,7 MH/s and every 4 or 5 PoWash a 3,8 MH/s but the iMac slows down and its very hard to use them while mining.

With around 2 MH/s its only fun to understand the concept it would pay the electricity bills :-)

Won't it be possible with OS X to reach around 40MH/s or doing I something wrong? Any ideas?

[nerle]

No ideas out there?

Does anybody use the AMD R9 M295X under Windows or Linux with ethminer?

[derubm]

stands the "M" for mobile ? - also is that a x2 ?

[nerle]

I don't think that M stands for mobile. It's a 5K high performance (not cheap) iMac. It's not a x2, that could be the reason.

[angel12]

I see the same kind of issue when mining on MacOS High Sierra with an RX 580. I get around 2-3mh/s instead of the expected 15-25mh/s

[angel12]

And the iMac's do use a notebook based graphics card, just fyi

[davidmckenzie]

Getting the same with iMac with M395x

$ bin/ethminer -G -M
  ℹ  15:59:08|          Found suitable OpenCL device [ AMD Radeon R9 M395X Compute Engine ] with 4294967296  bytes of GPU memory
Benchmarking on platform: CL
Preparing DAG for block #0
 cl  15:59:08|cl-0      No work. Pause for 3 s.
Warming up...
 cl  15:59:11|cl-0      New work: header #50c856ae… target 0000000000000002000000000000000000000000000000000000000000000000
 cl  15:59:11|cl-0      New seed #00000000…
 cl  15:59:11|cl-0      Platform: Apple
 cl  15:59:11|cl-0      Device:   AMD Radeon R9 M395X Compute Engine  / OpenCL 1.2
 cl  15:59:12|cl-0      Build info: <program source>:329:9: warning: comparison of integers of different signs: 'int' and 'const uint' (aka 'const unsigned int')
                if (i == thread_id)
      ~ ^  ~~~~~~~~~
<program source>:364:9: warning: comparison of integers of different signs: 'int' and 'const uint' (aka 'const unsigned int')
                if (i == thread_id)
      ~ ^  ~~~~~~~~~

 cl  15:59:12|cl-0      Creating light cache buffer, size 16776896
 cl  15:59:12|cl-0      Creating DAG buffer, size 1073739904
 cl  15:59:12|cl-0      Loading kernels
 cl  15:59:12|cl-0      Writing light cache buffer
 cl  15:59:12|cl-0      Creating buffer for header.
 cl  15:59:12|cl-0      Creating mining buffer
 cl  15:59:12|cl-0      Generating DAG
 cl  15:59:12|cl-0      DAG 0 %
 cl  15:59:12|cl-0      DAG 6 %
 cl  15:59:12|cl-0      DAG 12 %
 cl  15:59:13|cl-0      DAG 18 %
 cl  15:59:13|cl-0      DAG 25 %
 cl  15:59:13|cl-0      DAG 31 %
 cl  15:59:13|cl-0      DAG 37 %
 cl  15:59:14|cl-0      DAG 43 %
 cl  15:59:14|cl-0      DAG 50 %
 cl  15:59:14|cl-0      DAG 56 %
 cl  15:59:14|cl-0      DAG 62 %
 cl  15:59:14|cl-0      DAG 68 %
 cl  15:59:15|cl-0      DAG 75 %
 cl  15:59:15|cl-0      DAG 81 %
 cl  15:59:15|cl-0      DAG 87 %
 cl  15:59:15|cl-0      DAG 93 %
 cl  15:59:15|cl-0      Switch time 7523 ms / 4519393 us
Trial 1... 2623013
Trial 2... 2624064
Trial 3... 2622751
Trial 4... 2622488
Trial 5... 2622488
  ✘  15:59:38|cl-0      OpenCL Error: clSetKernelArg -48
min/mean/max: 2622488/2622960/2624064 H/s
inner mean: 2623276 H/s

[ricktobacco]

i have the same card with flags you get 4.20 ;) --cl-local-work 256 --cl-global-work 16384

[gratiot]

Do an Image backup of your HD so you can recover it later. Install your favourite version of Ubuntu running at init 3 (no graphics). Install the latest AMD drivers. install your miner. I bet that will kick up the hash rate. Just getting OSX out of the mix will be a big improvement.

[angel12]

We know that mining in other OS is going to be better. This issue’s purpose is to try to get OS X up to par with the other OS. If you don’t have anything to contribute, please don’t bother replying.

[nerle]

Nice, the flags put them really in 4.2 - 4.6 direction!

[gratiot]

Have you tried running in single user mode without the GUI. You might find the following link helpful.

http://www.westwind.com/reference/os-x/commandline/single-user.html

[kcamcam]

I'm having the same problem, switching to one of the older releases worked for me.

[nerle]

Which release and which hasrate do you get?

[DeadManWalkingTO]

Try latest version and feedback please. Thank you!

[davidmckenzie]

2.6MH/s average here on latest release (0.14.0.dev2)

bin/ethminer -G --farm-recheck 1000 -S eth.pool.minergate.com:45791 -u x@x

 cl  08:46:05|cl-0    |  New work: header #2dd20abb… target 00000286c02e1d1859b5923774f4a1c0083f69e68b7c3ede84188c11a30eaaed
 cl  08:46:05|cl-0    |  Switch time 346 ms / 104 us
  m  08:46:07|        |  Speed   2.54 Mh/s    gpu/0  2.54  [A415+0:R0+0:F0] Time: 00:16

[DeadManWalkingTO]

OpenCL Low Hashrate Report

152

[jamesatfish]

I reported the low hash rate in #152 linked above.

On a 2017 MacBook Pro with AMD Radeon Pro 560 I was seeing around 2.4Mh/s with the standard OpenCL settings.

With the flags mentioned above by @ricktobacco I'm getting about 4.5Mh/s.