Claymore miner recognizes cards but not all are hashing

Mining
1

Dear All,

I was wondering if somone could help me, Im pretty new to the mining game.
I have a pretty basic miner setup with 4 AMD HD 7950s.

I have been having a problem recently, that the miner recognises the cards, but when it starts hashing, most of the time at least 1 gpu is hashing 0.00 h/s

I have tried restarting the machine, then sometimes 2 of the gpus hash 0.00 h/s

its not always the same card, sometime it states gpu 1 or other times gpu3.

I have a 1000w EVGA gold. Bitroc pro mother board, Windows 7 and all on GPU risers.

When all 4 gpus are running, its hashing around 990 to 1100 h/s.

Its very frustrating at the moment, so any advice would be highly appreciated

2

miner01
miner01691×507 155 KB

Example of when only two cards are hashing

3

did you Set the following environment variables?

GPU_FORCE_64BIT_PTR 1
GPU_MAX_HEAP_SIZE 100
GPU_USE_SYNC_OBJECTS 1
GPU_MAX_ALLOC_PERCENT 100
GPU_SINGLE_ALLOC_PERCENT 100

Did you set Virtual Memory size in Windows at least 16 GB:
“Computer Properties / Advanced System Settings / Performance / Advanced / Virtual Memory”.

Are you running the most current driver update from amd?
Are you over clocking or underclocking?

4

Might sound silly How do you set these?

do you run a comand line?

GPU_FORCE_64BIT_PTR 1
GPU_MAX_HEAP_SIZE 100
GPU_USE_SYNC_OBJECTS 1
GPU_MAX_ALLOC_PERCENT 100
GPU_SINGLE_ALLOC_PERCENT 100

Ive set the virtual ram to 16Gig

All of the drivers are up to date

No over or under clocking, at the moment everything is just stock.

5

setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100

Ive added these to the start.bat fie

but still gpu3 is 0.00h/s

6

It does not go in your start.bat it goes in your environment variables

is that windows 7 32b or 64b

7

How do you set the variables, in my folder there isn’t such file.

It’s a 7, 64bit

8

right click my computer, go to properties
Advanced system settings
clicked advanced tab
click Environment Variables

9

Cheers Acid, that seems to have done it. All working now. Hopefully it should stay like that.