Not sure why my 4GB Sapphire Nitro+ won't mine it .. as many people mine with 4GB or less ... weird.
Did you follow his instructions for setting up the environment variables to use all the memory available?
Haven't touched the 4gb card for mining since the weekend (launched NiceHashMiner and it just crashes windows during any benchmark test).
Also haven't measured power usage on my 8GB card. Last time I checked my watt meter was way off when I tried to see how much my old KNC Jupiter used.
I just had a look for these instructions you're talking about ...
And either I am blind or there is just about NO instructions anywhere to be found.
Everyone just posts their speeds and hardware... not command line parameters to be found anywhere ... (or they are super old and don't work).
ethminer-0.9.41-genoil-1.1.x post says you can mine with 2GB card ... I can't even get my 4GB card to mine ..
But others are mining fine? What parameters are they using? Can't find any info ...