Bitcoin Forum

Hello! I have just built an ugly ass rig to mine zcash with.
currently I have 2 cards, one Asus 7950 and one Sapphire R9 290. I have another 290 laying on the side.
They are connected via powered pcie-risers.
I have made so that when windows boots it starts Claymores zcash miner instantly, allowing to start the operation without ever having a monitor connected to the rig.
when I first started the pc after the build, it didn't show any picture, and only the 7950 card where hashing.

after a while of windows fu**ing about, it got picture.
Now both cards are found in Windows and in Claymores zcash miner.
the 7950 are working perfectly at intensity 4 hashing about 265h/s overclocked a little bit ;)
BUT the R9 290 are giving a hashrate of between 45-50h/s, and when I hashed with only the 290, it gave me about 300h/s.
anyone have any idea about what might be missing or faulty?
or if anyone has a great guide for the software/hardware-setup for making it work?

Kind regards emiL932

Maybe you can swap the cards on the slots. Use 15.12.

maybe it's the motherboard that can't handle well 3 gpu especially if not done on purpose for mining? what motherboard do you have with these 3 gpu? the 7950 is also a very old card, probably there is a drivers issue too here

I also got strange behaviors from 2xx cards.
I needed to reset every settings in MSI fireburner when I installed a new card. Sometimes when a videocard stopped mining full speed I needed to change the memory frequency -125 mhz, and it started working full speed again.

yeah, the problem is, that if I look in AMD overdrive/Wattman I cant change any settings regarding core clock nor memoryclock. they are stuck at 300mhz and 450mhz.
maybe the only thing to do is try to install older drivers like the ones suggested. 15.12.


the motherboard im using is an Asus M5A97 R2.0 with an AMD 6300 cpu.
not the most ideal setup, I admit, but it was suppose to be really cheap! :)

driver bugs    go back to 16.11

and attach a monitor  to one of the low hash cards.

this issue also happens with eth mining

It's better to format the drive and reinstall the OS because the driver's uninstaller does not completely remove all the files

Also what windows are you using?
Windows 10 is a must

After the new istallation disable windows auto driver updates and try installing the suggested drivers.
 

Okay, ive been running windows 7 since my first attempt at windows 10 was failed, giving error messages when starting windows.
maybe I need to try the windows 10 install again then to see if there was something I failed at.
will try this this afternoon, to see if I can properly boot windows 10 at all then. will return with answers, but most of you belive that its software-related?
do I install the drivers with just one card installed, or all three?

Kind regards emiL932

That's the reason I suggested to reinstall windows, so to test the cards one at a time.

So, install just one card, also drivers and mining software and begin to mine
Do that for every GPU and check if mining is doing well

I have done that now, running windows 10, working fine with Claymore and all cards...
But when i plug them in all at once, windows wont find the 290's, only the 7970.
I run the 290s on a separate HP proliant 1000w psu, but i was thinking about the possible problem with just 2 6pin pcie powercables? Do i need the extra 2pin connector attached aswell? :)

i've 2 rig quad 280x with quad gtx 980 work fine on windows 7

Do you mean you can mix the amd and nvidia?