Hello,

This weekend i started to look into the world of bitcion mining.

After reading a little and watching some videos i decided to start mining.

I downloaded Guiminer V2012-12-03

I subscribed to a server(BTC guild (the Netherlands))

filled in my user name

selected my GFC( Sapphire HD 7850)

and pressed the mine button.

all went well and i started to mine at 270 Mhash/s

I alrdy knew from videos on YouTube that ATI cards from the 5xxx generation could do the same amount of Mhash/s do i decided to do some further investigation of how i could increase my Mhash/s

I found out that if i increased my GPU i could get more Mhash/s

I went to my Catalyst control center and went to AMD overdrive.

I increased my GPU from 920 to 1050(max) and i got  300mhash/s

after having read that increasing memory won't increase my speed i decided not to though my meomory speed.

After a while I checked up again and I noticed that my hash/s had dropped from 300 to around 250khas/s



I noticed that the activity of my graphics card dropped from around 98% to 0%.
so I changed all my settings back again ( from 1050 to 920)

I pressed the start button and off he went.

after a while the same dropped occurred.

so I went on to search of more people had this problem and if there was a solution.

after a few hours searching and finding noting, mostly due because I can't find a proper way to describe my problem, I decide to ask here

So I am using

Guiminer
Shappire HD 7850
Windows 7(64bit)
8gig of ram
i5 3570

also at the moment I have selected only one cpu affinity (0) and I am not using extra flags

IF you need more information don't hesitate to ask

Covux