Low Hashrate with R9 380x Ethereum mining

[Zitdadast]

Drivers depend on your hardware setup, I put the latest on my pc with 2x7950's and it would hash fine for a few minutes and then crash the graphics.  Under 15.12 they would hash slow at about 20gh and then under 15.11 I got the best stable hash at about 36 gh and no gpu crashes.

I recommend 15.11 and only install the drivers not the other junk they bundle.  Also make sure to uninstall previous, reboot, install, reboot and you should be good.

http://support.amd.com/en-us/download/desktop/previous?os=Windows%2010%20-%2064

I thought the 15.11 is the beta version, does it also work properly as the other normal versions?

the driver in the link above is the crimson 15.11 and the beta version you're referring to is the catalyst 15.11.1 beta.
i have no clue what's the difference between the two; just noticed you two are talking of two different drivers thought i'd point out!

edit:
just looked it up on driverserve.com
both Catalyst 15.11 & 15.11.1 are beta version but the crimson 15.11 is not, crimson 15.11.1 is!

For me, the crimson 15.11.1 does not work properly, but the Catalyst 15.11 & 15.11.1 works very well.

[malickie]

Yeah, I had an issue with massively slow hashrate on a brand new 390x.  Had the newest Crimson installed, bumped back to 15.something and my hashrate went to where it should be.  By bad hashrate I mean it was only putting out maybe 10 and it was never recognized by the pools.  So what I am saying is you need to do a search for a version of Crimson that will function properly for your setup. 

[Zitdadast]

Yeah, I had an issue with massively slow hashrate on a brand new 390x.  Had the newest Crimson installed, bumped back to 15.something and my hashrate went to where it should be.  By bad hashrate I mean it was only putting out maybe 10 and it was never recognized by the pools.  So what I am saying is you need to do a search for a version of Crimson that will function properly for your setup. 

For me, the Crimoson cannot regcognize 8 GPU in my 4x7990 set up. I used the lbr 7+ driver mod, did not work.

[coinyard]

Yeah, I had an issue with massively slow hashrate on a brand new 390x.  Had the newest Crimson installed, bumped back to 15.something and my hashrate went to where it should be.  By bad hashrate I mean it was only putting out maybe 10 and it was never recognized by the pools.  So what I am saying is you need to do a search for a version of Crimson that will function properly for your setup. 

For me, the Crimoson cannot regcognize 8 GPU in my 4x7990 set up. I used the lbr 7+ driver mod, did not work.

For my 4x7990 setup, with Catalyst 15.11 or early, the 8GPU were recognised instantly, there is no need to mod.

[juni0r]

Yeah, I had an issue with massively slow hashrate on a brand new 390x.  Had the newest Crimson installed, bumped back to 15.something and my hashrate went to where it should be.  By bad hashrate I mean it was only putting out maybe 10 and it was never recognized by the pools.  So what I am saying is you need to do a search for a version of Crimson that will function properly for your setup. 

For me, the Crimoson cannot regcognize 8 GPU in my 4x7990 set up. I used the lbr 7+ driver mod, did not work.

For my 4x7990 setup, with Catalyst 15.11 or early, the 8GPU were recognised instantly, there is no need to mod.

May i know What type of mobo you are using to run 8 x GPU ?

[apriyoni]

Yeah, I had an issue with massively slow hashrate on a brand new 390x.  Had the newest Crimson installed, bumped back to 15.something and my hashrate went to where it should be.  By bad hashrate I mean it was only putting out maybe 10 and it was never recognized by the pools.  So what I am saying is you need to do a search for a version of Crimson that will function properly for your setup. 

For me, the Crimoson cannot regcognize 8 GPU in my 4x7990 set up. I used the lbr 7+ driver mod, did not work.

For my 4x7990 setup, with Catalyst 15.11 or early, the 8GPU were recognised instantly, there is no need to mod.

May i know What type of mobo you are using to run 8 x GPU ?

I have a few motherboards running 8xGPU. For the 4X7990 = 8 GPU, it will run on many MB. Nothing special.

For the 2X7990+4X7970 or 2X7990+4x390, I use the Asrock H61 pro BTC.

[Bamsed]

Yeah, I had an issue with massively slow hashrate on a brand new 390x.  Had the newest Crimson installed, bumped back to 15.something and my hashrate went to where it should be.  By bad hashrate I mean it was only putting out maybe 10 and it was never recognized by the pools.  So what I am saying is you need to do a search for a version of Crimson that will function properly for your setup. 

For me, the Crimoson cannot regcognize 8 GPU in my 4x7990 set up. I used the lbr 7+ driver mod, did not work.

For my 4x7990 setup, with Catalyst 15.11 or early, the 8GPU were recognised instantly, there is no need to mod.

May i know What type of mobo you are using to run 8 x GPU ?

I have a few motherboards running 8xGPU. For the 4X7990 = 8 GPU, it will run on many MB. Nothing special.

For the 2X7990+4X7970 or 2X7990+4x390, I use the Asrock H61 pro BTC.

I have the 2X7990+4x390, I use the Asrock H81 pro BTC. But I have to use two power supplies instead of one.

[Yadamosan]

Yeah, I had an issue with massively slow hashrate on a brand new 390x.  Had the newest Crimson installed, bumped back to 15.something and my hashrate went to where it should be.  By bad hashrate I mean it was only putting out maybe 10 and it was never recognized by the pools.  So what I am saying is you need to do a search for a version of Crimson that will function properly for your setup. 

For me, the Crimoson cannot regcognize 8 GPU in my 4x7990 set up. I used the lbr 7+ driver mod, did not work.

For my 4x7990 setup, with Catalyst 15.11 or early, the 8GPU were recognised instantly, there is no need to mod.

May i know What type of mobo you are using to run 8 x GPU ?

I have a few motherboards running 8xGPU. For the 4X7990 = 8 GPU, it will run on many MB. Nothing special.

For the 2X7990+4X7970 or 2X7990+4x390, I use the Asrock H61 pro BTC.

I have the 2X7990+4x390, I use the Asrock H81 pro BTC. But I have to use two power supplies instead of one.

If you under volt the 7990 and 390, you might be able to use one power supply, such as 1250W platinum .

[fenomenhaa]

Which driver version can possible to change(underclcok) then the deafult speed.( mem and core).15.7.1 and. crimson 15.12 cannot possible.Anybosy knows ?

[Zitdadast]

Which driver version can possible to change(underclcok) then the deafult speed.( mem and core).15.7.1 and. crimson 15.12 cannot possible.Anybosy knows ?

I used the 14.4, 14.6 and 14.9, 15.7.1, 15.11. They can all change the voltage of the Core and the frequencies.